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, 2008,
   4    2009  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    Under Section 7 of GPL version 3, you are granted additional
  19    permissions described in the GCC Runtime Library Exception, version
  20    3.1, as published by the Free Software Foundation.
  21
  22    You should have received a copy of the GNU General Public License and
  23    a copy of the GCC Runtime Library Exception along with this program;
  24    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  25    <http://www.gnu.org/licenses/>.  */
  26
  27 #ifndef RS6000_BI_ARCH
  28
  29 #undef  DEFAULT_ABI
  30 #define DEFAULT_ABI ABI_AIX
  31
  32 #undef  TARGET_64BIT
  33 #define TARGET_64BIT 1
  34
  35 #define DEFAULT_ARCH64_P 1
  36 #define RS6000_BI_ARCH_P 0
  37
  38 #else
  39
  40 #define DEFAULT_ARCH64_P (TARGET_DEFAULT & MASK_64BIT)
  41 #define RS6000_BI_ARCH_P 1
  42
  43 #endif
  44
  45 #ifdef IN_LIBGCC2
  46 #undef TARGET_64BIT
  47 #ifdef __powerpc64__
  48 #define TARGET_64BIT 1
  49 #else
  50 #define TARGET_64BIT 0
  51 #endif
  52 #endif
  53
  54 #undef  TARGET_AIX
  55 #define TARGET_AIX TARGET_64BIT
  56
  57 #ifdef HAVE_LD_NO_DOT_SYMS
  58 /* New ABI uses a local sym for the function entry point.  */
  59 extern int dot_symbols;
  60 #undef DOT_SYMBOLS
  61 #define DOT_SYMBOLS dot_symbols
  62 #endif
  63
  64 #undef  PROCESSOR_DEFAULT
  65 #define PROCESSOR_DEFAULT PROCESSOR_POWER6
  66 #undef  PROCESSOR_DEFAULT64
  67 #define PROCESSOR_DEFAULT64 PROCESSOR_POWER6
  68
  69 /* We don't need to generate entries in .fixup, except when
  70    -mrelocatable or -mrelocatable-lib is given.  */
  71 #undef RELOCATABLE_NEEDS_FIXUP
  72 #define RELOCATABLE_NEEDS_FIXUP \
  73   (target_flags & target_flags_explicit & MASK_RELOCATABLE)
  74
  75 #undef  RS6000_ABI_NAME
  76 #define RS6000_ABI_NAME "linux"
  77
  78 #define INVALID_64BIT "-m%s not supported in this configuration"
  79 #define INVALID_32BIT INVALID_64BIT
  80
  81 #undef  SUBSUBTARGET_OVERRIDE_OPTIONS
  82 #define SUBSUBTARGET_OVERRIDE_OPTIONS                           \
  83   do                                                            \
  84     {                                                           \
  85       if (!rs6000_explicit_options.alignment)                   \
  86         rs6000_alignment_flags = MASK_ALIGN_NATURAL;            \
  87       if (TARGET_64BIT)                                         \
  88         {                                                       \
  89           if (DEFAULT_ABI != ABI_AIX)                           \
  90             {                                                   \
  91               rs6000_current_abi = ABI_AIX;                     \
  92               error (INVALID_64BIT, "call");                    \
  93             }                                                   \
  94           dot_symbols = !strcmp (rs6000_abi_name, "aixdesc");   \
  95           if (target_flags & MASK_RELOCATABLE)                  \
  96             {                                                   \
  97               target_flags &= ~MASK_RELOCATABLE;                \
  98               error (INVALID_64BIT, "relocatable");             \
  99             }                                                   \
 100           if (target_flags & MASK_EABI)                         \
 101             {                                                   \
 102               target_flags &= ~MASK_EABI;                       \
 103               error (INVALID_64BIT, "eabi");                    \
 104             }                                                   \
 105           if (TARGET_PROTOTYPE)                                 \
 106             {                                                   \
 107               target_prototype = 0;                             \
 108               error (INVALID_64BIT, "prototype");               \
 109             }                                                   \
 110           if ((target_flags & MASK_POWERPC64) == 0)             \
 111             {                                                   \
 112               target_flags |= MASK_POWERPC64;                   \
 113               error ("-m64 requires a PowerPC64 cpu");          \
 114             }                                                   \
 115         }                                                       \
 116       else                                                      \
 117         {                                                       \
 118           if (!RS6000_BI_ARCH_P)                                \
 119             error (INVALID_32BIT, "32");                        \
 120           if (TARGET_PROFILE_KERNEL)                            \
 121             {                                                   \
 122               SET_PROFILE_KERNEL (0);                           \
 123               error (INVALID_32BIT, "profile-kernel");          \
 124             }                                                   \
 125         }                                                       \
 126     }                                                           \
 127   while (0)
 128
 129 #ifdef  RS6000_BI_ARCH
 130
 131 #undef  OVERRIDE_OPTIONS
 132 #define OVERRIDE_OPTIONS \
 133   rs6000_override_options (((TARGET_DEFAULT ^ target_flags) & MASK_64BIT) \
 134                            ? (char *) 0 : TARGET_CPU_DEFAULT)
 135
 136 #endif
 137
 138 #undef  ASM_DEFAULT_SPEC
 139 #undef  ASM_SPEC
 140 #undef  LINK_OS_LINUX_SPEC
 141
 142 /* FIXME: This will quite possibly choose the wrong dynamic linker.  */
 143 #undef  LINK_OS_GNU_SPEC
 144 #define LINK_OS_GNU_SPEC LINK_OS_LINUX_SPEC
 145
 146 #ifndef RS6000_BI_ARCH
 147 #define ASM_DEFAULT_SPEC "-mppc64"
 148 #define ASM_SPEC         "%(asm_spec64) %(asm_spec_common)"
 149 #define LINK_OS_LINUX_SPEC "%(link_os_linux_spec64)"
 150 #else
 151 #if DEFAULT_ARCH64_P
 152 #define ASM_DEFAULT_SPEC "-mppc%{!m32:64}"
 153 #define ASM_SPEC         "%{m32:%(asm_spec32)}%{!m32:%(asm_spec64)} %(asm_spec_common)"
 154 #define LINK_OS_LINUX_SPEC "%{m32:%(link_os_linux_spec32)}%{!m32:%(link_os_linux_spec64)}"
 155 #else
 156 #define ASM_DEFAULT_SPEC "-mppc%{m64:64}"
 157 #define ASM_SPEC         "%{!m64:%(asm_spec32)}%{m64:%(asm_spec64)} %(asm_spec_common)"
 158 #define LINK_OS_LINUX_SPEC "%{!m64:%(link_os_linux_spec32)}%{m64:%(link_os_linux_spec64)}"
 159 #endif
 160 #endif
 161
 162 #define ASM_SPEC32 "-a32 %{n} %{T} %{Ym,*} %{Yd,*} \
 163 %{mrelocatable} %{mrelocatable-lib} %{fpic:-K PIC} %{fPIC:-K PIC} \
 164 %{memb} %{!memb: %{msdata=eabi: -memb}} \
 165 %{!mlittle: %{!mlittle-endian: %{!mbig: %{!mbig-endian: \
 166     %{mcall-freebsd: -mbig} \
 167     %{mcall-i960-old: -mlittle} \
 168     %{mcall-linux: -mbig} \
 169     %{mcall-gnu: -mbig} \
 170     %{mcall-netbsd: -mbig} \
 171 }}}}"
 172
 173 #define ASM_SPEC64 "-a64"
 174
 175 #define ASM_SPEC_COMMON "%(asm_cpu) \
 176 %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}} \
 177 %{v:-V} %{Qy:} %{!Qn:-Qy} %{Wa,*:%*} \
 178 %{mlittle} %{mlittle-endian} %{mbig} %{mbig-endian}"
 179
 180 #undef  SUBSUBTARGET_EXTRA_SPECS
 181 #define SUBSUBTARGET_EXTRA_SPECS \
 182   { "asm_spec_common",          ASM_SPEC_COMMON },                      \
 183   { "asm_spec32",               ASM_SPEC32 },                           \
 184   { "asm_spec64",               ASM_SPEC64 },                           \
 185   { "link_os_linux_spec32",     LINK_OS_LINUX_SPEC32 },                 \
 186   { "link_os_linux_spec64",     LINK_OS_LINUX_SPEC64 },
 187
 188 #undef  MULTILIB_DEFAULTS
 189 #if DEFAULT_ARCH64_P
 190 #define MULTILIB_DEFAULTS { "m64" }
 191 #else
 192 #define MULTILIB_DEFAULTS { "m32" }
 193 #endif
 194
 195 #ifndef RS6000_BI_ARCH
 196
 197 /* 64-bit PowerPC Linux is always big-endian.  */
 198 #undef  TARGET_LITTLE_ENDIAN
 199 #define TARGET_LITTLE_ENDIAN    0
 200
 201 /* 64-bit PowerPC Linux always has a TOC.  */
 202 #undef  TARGET_TOC
 203 #define TARGET_TOC              1
 204
 205 /* Some things from sysv4.h we don't do when 64 bit.  */
 206 #undef  TARGET_RELOCATABLE
 207 #define TARGET_RELOCATABLE      0
 208 #undef  TARGET_EABI
 209 #define TARGET_EABI             0
 210 #undef  TARGET_PROTOTYPE
 211 #define TARGET_PROTOTYPE        0
 212 #undef RELOCATABLE_NEEDS_FIXUP
 213 #define RELOCATABLE_NEEDS_FIXUP 0
 214
 215 #endif
 216
 217 /* We use glibc _mcount for profiling.  */
 218 #define NO_PROFILE_COUNTERS 1
 219 #define PROFILE_HOOK(LABEL) \
 220   do { if (TARGET_64BIT) output_profile_hook (LABEL); } while (0)
 221
 222 /* PowerPC64 Linux word-aligns FP doubles when -malign-power is given.  */
 223 #undef  ADJUST_FIELD_ALIGN
 224 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
 225   ((TARGET_ALTIVEC && TREE_CODE (TREE_TYPE (FIELD)) == VECTOR_TYPE)     \
 226    ? 128                                                                \
 227    : (TARGET_64BIT                                                      \
 228       && TARGET_ALIGN_NATURAL == 0                                      \
 229       && TYPE_MODE (strip_array_types (TREE_TYPE (FIELD))) == DFmode)   \
 230    ? MIN ((COMPUTED), 32)                                               \
 231    : (COMPUTED))
 232
 233 /* PowerPC64 Linux increases natural record alignment to doubleword if
 234    the first field is an FP double, only if in power alignment mode.  */
 235 #undef  ROUND_TYPE_ALIGN
 236 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                   \
 237   ((TARGET_64BIT                                                        \
 238     && (TREE_CODE (STRUCT) == RECORD_TYPE                               \
 239         || TREE_CODE (STRUCT) == UNION_TYPE                             \
 240         || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                       \
 241     && TARGET_ALIGN_NATURAL == 0)                                       \
 242    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)      \
 243    : MAX ((COMPUTED), (SPECIFIED)))
 244
 245 /* Use the default for compiling target libs.  */
 246 #ifdef IN_TARGET_LIBS
 247 #undef TARGET_ALIGN_NATURAL
 248 #define TARGET_ALIGN_NATURAL 1
 249 #endif
 250
 251 /* Indicate that jump tables go in the text section.  */
 252 #undef  JUMP_TABLES_IN_TEXT_SECTION
 253 #define JUMP_TABLES_IN_TEXT_SECTION TARGET_64BIT
 254
 255 /* The linux ppc64 ABI isn't explicit on whether aggregates smaller
 256    than a doubleword should be padded upward or downward.  You could
 257    reasonably assume that they follow the normal rules for structure
 258    layout treating the parameter area as any other block of memory,
 259    then map the reg param area to registers.  i.e. pad upward.
 260    Setting both of the following defines results in this behavior.
 261    Setting just the first one will result in aggregates that fit in a
 262    doubleword being padded downward, and others being padded upward.
 263    Not a bad idea as this results in struct { int x; } being passed
 264    the same way as an int.  */
 265 #define AGGREGATE_PADDING_FIXED TARGET_64BIT
 266 #define AGGREGATES_PAD_UPWARD_ALWAYS 0
 267
 268 /* Specify padding for the last element of a block move between
 269    registers and memory.  FIRST is nonzero if this is the only
 270    element.  */
 271 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 272   (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
 273
 274 /* __throw will restore its own return address to be the same as the
 275    return address of the function that the throw is being made to.
 276    This is unfortunate, because we want to check the original
 277    return address to see if we need to restore the TOC.
 278    So we have to squirrel it away with this.  */
 279 #define SETUP_FRAME_ADDRESSES() \
 280   do { if (TARGET_64BIT) rs6000_aix_emit_builtin_unwind_init (); } while (0)
 281
 282 /* Override svr4.h  */
 283 #undef MD_EXEC_PREFIX
 284 #undef MD_STARTFILE_PREFIX
 285
 286 /* Linux doesn't support saving and restoring 64-bit regs in a 32-bit
 287    process.  */
 288 #define OS_MISSING_POWERPC64 !TARGET_64BIT
 289
 290 /* glibc has float and long double forms of math functions.  */
 291 #undef  TARGET_C99_FUNCTIONS
 292 #define TARGET_C99_FUNCTIONS (OPTION_GLIBC)
 293
 294 /* Whether we have sincos that follows the GNU extension.  */
 295 #undef  TARGET_HAS_SINCOS
 296 #define TARGET_HAS_SINCOS (OPTION_GLIBC)
 297
 298 #undef  TARGET_OS_CPP_BUILTINS
 299 #define TARGET_OS_CPP_BUILTINS()                        \
 300   do                                                    \
 301     {                                                   \
 302       if (TARGET_64BIT)                                 \
 303         {                                               \
 304           builtin_define ("__PPC__");                   \
 305           builtin_define ("__PPC64__");                 \
 306           builtin_define ("__powerpc__");               \
 307           builtin_define ("__powerpc64__");             \
 308           builtin_assert ("cpu=powerpc64");             \
 309           builtin_assert ("machine=powerpc64");         \
 310         }                                               \
 311       else                                              \
 312         {                                               \
 313           builtin_define_std ("PPC");                   \
 314           builtin_define_std ("powerpc");               \
 315           builtin_assert ("cpu=powerpc");               \
 316           builtin_assert ("machine=powerpc");           \
 317           TARGET_OS_SYSV_CPP_BUILTINS ();               \
 318         }                                               \
 319     }                                                   \
 320   while (0)
 321
 322 #undef  CPP_OS_DEFAULT_SPEC
 323 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux)"
 324
 325 /* The GNU C++ standard library currently requires _GNU_SOURCE being
 326    defined on glibc-based systems. This temporary hack accomplishes this,
 327    it should go away as soon as libstdc++-v3 has a real fix.  */
 328 #undef  CPLUSPLUS_CPP_SPEC
 329 #define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
 330
 331 #undef  LINK_SHLIB_SPEC
 332 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
 333
 334 #undef  LIB_DEFAULT_SPEC
 335 #define LIB_DEFAULT_SPEC "%(lib_linux)"
 336
 337 #undef  STARTFILE_DEFAULT_SPEC
 338 #define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
 339
 340 #undef  ENDFILE_DEFAULT_SPEC
 341 #define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
 342
 343 #undef  LINK_START_DEFAULT_SPEC
 344 #define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
 345
 346 #undef  LINK_OS_DEFAULT_SPEC
 347 #define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
 348
 349 #define GLIBC_DYNAMIC_LINKER32 "/lib/ld.so.1"
 350 #define GLIBC_DYNAMIC_LINKER64 "/lib64/ld64.so.1"
 351 #define UCLIBC_DYNAMIC_LINKER32 "/lib/ld-uClibc.so.0"
 352 #define UCLIBC_DYNAMIC_LINKER64 "/lib/ld64-uClibc.so.0"
 353 #if UCLIBC_DEFAULT
 354 #define CHOOSE_DYNAMIC_LINKER(G, U) "%{mglibc:%{muclibc:%e-mglibc and -muclibc used together}" G ";:" U "}"
 355 #else
 356 #define CHOOSE_DYNAMIC_LINKER(G, U) "%{muclibc:%{mglibc:%e-mglibc and -muclibc used together}" U ";:" G "}"
 357 #endif
 358 #define LINUX_DYNAMIC_LINKER32 \
 359   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32)
 360 #define LINUX_DYNAMIC_LINKER64 \
 361   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64)
 362
 363
 364 #define LINK_OS_LINUX_SPEC32 "-m elf32ppclinux %{!shared: %{!static: \
 365   %{rdynamic:-export-dynamic} \
 366   %{!dynamic-linker:-dynamic-linker " LINUX_DYNAMIC_LINKER32 "}}}"
 367
 368 #define LINK_OS_LINUX_SPEC64 "-m elf64ppc %{!shared: %{!static: \
 369   %{rdynamic:-export-dynamic} \
 370   %{!dynamic-linker:-dynamic-linker " LINUX_DYNAMIC_LINKER64 "}}}"
 371
 372 #undef  TOC_SECTION_ASM_OP
 373 #define TOC_SECTION_ASM_OP \
 374   (TARGET_64BIT                                         \
 375    ? "\t.section\t\".toc\",\"aw\""                      \
 376    : "\t.section\t\".got\",\"aw\"")
 377
 378 #undef  MINIMAL_TOC_SECTION_ASM_OP
 379 #define MINIMAL_TOC_SECTION_ASM_OP \
 380   (TARGET_64BIT                                         \
 381    ? "\t.section\t\".toc1\",\"aw\""                     \
 382    : ((TARGET_RELOCATABLE || flag_pic)                  \
 383       ? "\t.section\t\".got2\",\"aw\""                  \
 384       : "\t.section\t\".got1\",\"aw\""))
 385
 386 #undef  TARGET_VERSION
 387 #define TARGET_VERSION fprintf (stderr, " (PowerPC64 GNU/Linux)");
 388
 389 /* Must be at least as big as our pointer type.  */
 390 #undef  SIZE_TYPE
 391 #define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int")
 392
 393 #undef  PTRDIFF_TYPE
 394 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
 395
 396 #undef  WCHAR_TYPE
 397 #define WCHAR_TYPE (TARGET_64BIT ? "int" : "long int")
 398 #undef  WCHAR_TYPE_SIZE
 399 #define WCHAR_TYPE_SIZE 32
 400
 401 /* Override rs6000.h definition.  */
 402 #undef  ASM_APP_ON
 403 #define ASM_APP_ON "#APP\n"
 404
 405 /* Override rs6000.h definition.  */
 406 #undef  ASM_APP_OFF
 407 #define ASM_APP_OFF "#NO_APP\n"
 408
 409 /* PowerPC no-op instruction.  */
 410 #undef  RS6000_CALL_GLUE
 411 #define RS6000_CALL_GLUE (TARGET_64BIT ? "nop" : "cror 31,31,31")
 412
 413 #undef  RS6000_MCOUNT
 414 #define RS6000_MCOUNT "_mcount"
 415
 416 #ifdef __powerpc64__
 417 /* _init and _fini functions are built from bits spread across many
 418    object files, each potentially with a different TOC pointer.  For
 419    that reason, place a nop after the call so that the linker can
 420    restore the TOC pointer if a TOC adjusting call stub is needed.  */
 421 #if DOT_SYMBOLS
 422 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 423   asm (SECTION_OP "\n"                                  \
 424 "       bl ." #FUNC "\n"                                \
 425 "       nop\n"                                          \
 426 "       .previous");
 427 #else
 428 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 429   asm (SECTION_OP "\n"                                  \
 430 "       bl " #FUNC "\n"                                 \
 431 "       nop\n"                                          \
 432 "       .previous");
 433 #endif
 434 #endif
 435
 436 /* FP save and restore routines.  */
 437 #undef  SAVE_FP_PREFIX
 438 #define SAVE_FP_PREFIX (TARGET_64BIT ? "._savef" : "_savefpr_")
 439 #undef  SAVE_FP_SUFFIX
 440 #define SAVE_FP_SUFFIX ""
 441 #undef  RESTORE_FP_PREFIX
 442 #define RESTORE_FP_PREFIX (TARGET_64BIT ? "._restf" : "_restfpr_")
 443 #undef  RESTORE_FP_SUFFIX
 444 #define RESTORE_FP_SUFFIX ""
 445
 446 /* Dwarf2 debugging.  */
 447 #undef  PREFERRED_DEBUGGING_TYPE
 448 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 449
 450 /* This is how to declare the size of a function.  */
 451 #undef  ASM_DECLARE_FUNCTION_SIZE
 452 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 453   do                                                                    \
 454     {                                                                   \
 455       if (!flag_inhibit_size_directive)                                 \
 456         {                                                               \
 457           fputs ("\t.size\t", (FILE));                                  \
 458           if (TARGET_64BIT && DOT_SYMBOLS)                              \
 459             putc ('.', (FILE));                                         \
 460           assemble_name ((FILE), (FNAME));                              \
 461           fputs (",.-", (FILE));                                        \
 462           rs6000_output_function_entry (FILE, FNAME);                   \
 463           putc ('\n', (FILE));                                          \
 464         }                                                               \
 465     }                                                                   \
 466   while (0)
 467
 468 /* Return nonzero if this entry is to be written into the constant
 469    pool in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF
 470    or a CONST containing one of them.  If -mfp-in-toc (the default),
 471    we also do this for floating-point constants.  We actually can only
 472    do this if the FP formats of the target and host machines are the
 473    same, but we can't check that since not every file that uses
 474    the macros includes real.h.  We also do this when we can write the
 475    entry into the TOC and the entry is not larger than a TOC entry.  */
 476
 477 #undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
 478 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
 479   (TARGET_TOC                                                           \
 480    && (GET_CODE (X) == SYMBOL_REF                                       \
 481        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
 482            && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)           \
 483        || GET_CODE (X) == LABEL_REF                                     \
 484        || (GET_CODE (X) == CONST_INT                                    \
 485            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
 486        || (GET_CODE (X) == CONST_DOUBLE                                 \
 487            && ((TARGET_64BIT                                            \
 488                 && (TARGET_MINIMAL_TOC                                  \
 489                     || (SCALAR_FLOAT_MODE_P (GET_MODE (X))              \
 490                         && ! TARGET_NO_FP_IN_TOC)))                     \
 491                || (!TARGET_64BIT                                        \
 492                    && !TARGET_NO_FP_IN_TOC                              \
 493                    && !TARGET_RELOCATABLE                               \
 494                    && SCALAR_FLOAT_MODE_P (GET_MODE (X))                \
 495                    && BITS_PER_WORD == HOST_BITS_PER_INT)))))
 496
 497 /* Select a format to encode pointers in exception handling data.  CODE
 498    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
 499    true if the symbol may be affected by dynamic relocations.  */
 500 #undef  ASM_PREFERRED_EH_DATA_FORMAT
 501 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 502   ((TARGET_64BIT || flag_pic || TARGET_RELOCATABLE)                     \
 503    ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel               \
 504       | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4))             \
 505    : DW_EH_PE_absptr)
 506
 507 /* For backward compatibility, we must continue to use the AIX
 508    structure return convention.  */
 509 #undef DRAFT_V4_STRUCT_RET
 510 #define DRAFT_V4_STRUCT_RET (!TARGET_64BIT)
 511
 512 #define TARGET_ASM_FILE_END rs6000_elf_end_indicate_exec_stack
 513
 514 #define TARGET_POSIX_IO
 515
 516 #define LINK_GCC_C_SEQUENCE_SPEC \
 517   "%{static:--start-group} %G %L %{static:--end-group}%{!static:%G}"
 518
 519 /* Use --as-needed -lgcc_s for eh support.  */
 520 #ifdef HAVE_LD_AS_NEEDED
 521 #define USE_LD_AS_NEEDED 1
 522 #endif
 523
 524 #define MD_UNWIND_SUPPORT "config/rs6000/linux-unwind.h"
 525
 526 #ifdef TARGET_LIBC_PROVIDES_SSP
 527 /* ppc32 glibc provides __stack_chk_guard in -0x7008(2),
 528    ppc64 glibc provides it at -0x7010(13).  */
 529 #define TARGET_THREAD_SSP_OFFSET        (TARGET_64BIT ? -0x7010 : -0x7008)
 530 #endif
 531
 532 #define POWERPC_LINUX
 533
 534 /* ppc{32,64} linux has 128-bit long double support in glibc 2.4 and later.  */
 535 #ifdef TARGET_DEFAULT_LONG_DOUBLE_128
 536 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
 537 #endif