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, 2010, 2011  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 #define TARGET_PROFILE_KERNEL profile_kernel
  65
  66 #define TARGET_USES_LINUX64_OPT 1
  67 #ifdef HAVE_LD_LARGE_TOC
  68 #undef TARGET_CMODEL
  69 #define TARGET_CMODEL rs6000_current_cmodel
  70 #define SET_CMODEL(opt) rs6000_current_cmodel = opt
  71 #else
  72 #define SET_CMODEL(opt) do {} while (0)
  73 #endif
  74
  75 #undef  PROCESSOR_DEFAULT
  76 #define PROCESSOR_DEFAULT PROCESSOR_POWER7
  77 #undef  PROCESSOR_DEFAULT64
  78 #define PROCESSOR_DEFAULT64 PROCESSOR_POWER7
  79
  80 /* We don't need to generate entries in .fixup, except when
  81    -mrelocatable or -mrelocatable-lib is given.  */
  82 #undef RELOCATABLE_NEEDS_FIXUP
  83 #define RELOCATABLE_NEEDS_FIXUP \
  84   (rs6000_isa_flags & rs6000_isa_flags_explicit & OPTION_MASK_RELOCATABLE)
  85
  86 #undef  RS6000_ABI_NAME
  87 #define RS6000_ABI_NAME "linux"
  88
  89 #define INVALID_64BIT "-m%s not supported in this configuration"
  90 #define INVALID_32BIT INVALID_64BIT
  91
  92 #undef  SUBSUBTARGET_OVERRIDE_OPTIONS
  93 #define SUBSUBTARGET_OVERRIDE_OPTIONS                           \
  94   do                                                            \
  95     {                                                           \
  96       if (!global_options_set.x_rs6000_alignment_flags)         \
  97         rs6000_alignment_flags = MASK_ALIGN_NATURAL;            \
  98       if (TARGET_64BIT)                                         \
  99         {                                                       \
 100           if (DEFAULT_ABI != ABI_AIX)                           \
 101             {                                                   \
 102               rs6000_current_abi = ABI_AIX;                     \
 103               error (INVALID_64BIT, "call");                    \
 104             }                                                   \
 105           dot_symbols = !strcmp (rs6000_abi_name, "aixdesc");   \
 106           if (rs6000_isa_flags & OPTION_MASK_RELOCATABLE)       \
 107             {                                                   \
 108               rs6000_isa_flags &= ~OPTION_MASK_RELOCATABLE;     \
 109               error (INVALID_64BIT, "relocatable");             \
 110             }                                                   \
 111           if (rs6000_isa_flags & OPTION_MASK_EABI)              \
 112             {                                                   \
 113               rs6000_isa_flags &= ~OPTION_MASK_EABI;            \
 114               error (INVALID_64BIT, "eabi");                    \
 115             }                                                   \
 116           if (TARGET_PROTOTYPE)                                 \
 117             {                                                   \
 118               target_prototype = 0;                             \
 119               error (INVALID_64BIT, "prototype");               \
 120             }                                                   \
 121           if ((rs6000_isa_flags & OPTION_MASK_POWERPC64) == 0)  \
 122             {                                                   \
 123               rs6000_isa_flags |= OPTION_MASK_POWERPC64;        \
 124               error ("-m64 requires a PowerPC64 cpu");          \
 125             }                                                   \
 126           if ((rs6000_isa_flags_explicit                        \
 127                & OPTION_MASK_MINIMAL_TOC) != 0)                 \
 128             {                                                   \
 129               if (global_options_set.x_rs6000_current_cmodel    \
 130                   && rs6000_current_cmodel != CMODEL_SMALL)     \
 131                 error ("-mcmodel incompatible with other toc options"); \
 132               SET_CMODEL (CMODEL_SMALL);                        \
 133             }                                                   \
 134           else                                                  \
 135             {                                                   \
 136               if (!global_options_set.x_rs6000_current_cmodel)  \
 137                 SET_CMODEL (CMODEL_MEDIUM);                     \
 138               if (rs6000_current_cmodel != CMODEL_SMALL)        \
 139                 {                                               \
 140                   TARGET_NO_FP_IN_TOC = 0;                      \
 141                   TARGET_NO_SUM_IN_TOC = 0;                     \
 142                 }                                               \
 143             }                                                   \
 144         }                                                       \
 145       else                                                      \
 146         {                                                       \
 147           if (!RS6000_BI_ARCH_P)                                \
 148             error (INVALID_32BIT, "32");                        \
 149           if (TARGET_PROFILE_KERNEL)                            \
 150             {                                                   \
 151               TARGET_PROFILE_KERNEL = 0;                        \
 152               error (INVALID_32BIT, "profile-kernel");          \
 153             }                                                   \
 154           if (global_options_set.x_rs6000_current_cmodel)       \
 155             {                                                   \
 156               SET_CMODEL (CMODEL_SMALL);                        \
 157               error (INVALID_32BIT, "cmodel");                  \
 158             }                                                   \
 159         }                                                       \
 160     }                                                           \
 161   while (0)
 162
 163 #undef  ASM_DEFAULT_SPEC
 164 #undef  ASM_SPEC
 165 #undef  LINK_OS_LINUX_SPEC
 166
 167 #ifndef RS6000_BI_ARCH
 168 #define ASM_DEFAULT_SPEC "-mppc64"
 169 #define ASM_SPEC         "%(asm_spec64) %(asm_spec_common)"
 170 #define LINK_OS_LINUX_SPEC "%(link_os_linux_spec64)"
 171 #else
 172 #if DEFAULT_ARCH64_P
 173 #define ASM_DEFAULT_SPEC "-mppc%{!m32:64}"
 174 #define ASM_SPEC         "%{m32:%(asm_spec32)}%{!m32:%(asm_spec64)} %(asm_spec_common)"
 175 #define LINK_OS_LINUX_SPEC "%{m32:%(link_os_linux_spec32)}%{!m32:%(link_os_linux_spec64)}"
 176 #else
 177 #define ASM_DEFAULT_SPEC "-mppc%{m64:64}"
 178 #define ASM_SPEC         "%{!m64:%(asm_spec32)}%{m64:%(asm_spec64)} %(asm_spec_common)"
 179 #define LINK_OS_LINUX_SPEC "%{!m64:%(link_os_linux_spec32)}%{m64:%(link_os_linux_spec64)}"
 180 #endif
 181 #endif
 182
 183 #define ASM_SPEC32 "-a32 \
 184 %{mrelocatable} %{mrelocatable-lib} %{fpic:-K PIC} %{fPIC:-K PIC} \
 185 %{memb} %{!memb: %{msdata=eabi: -memb}} \
 186 %{!mlittle: %{!mlittle-endian: %{!mbig: %{!mbig-endian: \
 187     %{mcall-freebsd: -mbig} \
 188     %{mcall-i960-old: -mlittle} \
 189     %{mcall-linux: -mbig} \
 190     %{mcall-netbsd: -mbig} \
 191 }}}}"
 192
 193 #define ASM_SPEC64 "-a64"
 194
 195 #define ASM_SPEC_COMMON "%(asm_cpu) \
 196 %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}} \
 197 %{mlittle} %{mlittle-endian} %{mbig} %{mbig-endian}"
 198
 199 #undef  SUBSUBTARGET_EXTRA_SPECS
 200 #define SUBSUBTARGET_EXTRA_SPECS \
 201   { "asm_spec_common",          ASM_SPEC_COMMON },                      \
 202   { "asm_spec32",               ASM_SPEC32 },                           \
 203   { "asm_spec64",               ASM_SPEC64 },                           \
 204   { "link_os_linux_spec32",     LINK_OS_LINUX_SPEC32 },                 \
 205   { "link_os_linux_spec64",     LINK_OS_LINUX_SPEC64 },
 206
 207 #undef  MULTILIB_DEFAULTS
 208 #if DEFAULT_ARCH64_P
 209 #define MULTILIB_DEFAULTS { "m64" }
 210 #else
 211 #define MULTILIB_DEFAULTS { "m32" }
 212 #endif
 213
 214 #ifndef RS6000_BI_ARCH
 215
 216 /* 64-bit PowerPC Linux is always big-endian.  */
 217 #undef  OPTION_LITTLE_ENDIAN
 218 #define OPTION_LITTLE_ENDIAN    0
 219
 220 /* 64-bit PowerPC Linux always has a TOC.  */
 221 #undef  TARGET_TOC
 222 #define TARGET_TOC              1
 223
 224 /* Some things from sysv4.h we don't do when 64 bit.  */
 225 #undef  OPTION_RELOCATABLE
 226 #define OPTION_RELOCATABLE      0
 227 #undef  OPTION_EABI
 228 #define OPTION_EABI             0
 229 #undef  OPTION_PROTOTYPE
 230 #define OPTION_PROTOTYPE        0
 231 #undef RELOCATABLE_NEEDS_FIXUP
 232 #define RELOCATABLE_NEEDS_FIXUP 0
 233
 234 #endif
 235
 236 /* We use glibc _mcount for profiling.  */
 237 #define NO_PROFILE_COUNTERS 1
 238 #define PROFILE_HOOK(LABEL) \
 239   do { if (TARGET_64BIT) output_profile_hook (LABEL); } while (0)
 240
 241 /* PowerPC64 Linux word-aligns FP doubles when -malign-power is given.  */
 242 #undef  ADJUST_FIELD_ALIGN
 243 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
 244   ((TARGET_ALTIVEC && TREE_CODE (TREE_TYPE (FIELD)) == VECTOR_TYPE)     \
 245    ? 128                                                                \
 246    : (TARGET_64BIT                                                      \
 247       && TARGET_ALIGN_NATURAL == 0                                      \
 248       && TYPE_MODE (strip_array_types (TREE_TYPE (FIELD))) == DFmode)   \
 249    ? MIN ((COMPUTED), 32)                                               \
 250    : (COMPUTED))
 251
 252 /* PowerPC64 Linux increases natural record alignment to doubleword if
 253    the first field is an FP double, only if in power alignment mode.  */
 254 #undef  ROUND_TYPE_ALIGN
 255 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                   \
 256   ((TARGET_64BIT                                                        \
 257     && (TREE_CODE (STRUCT) == RECORD_TYPE                               \
 258         || TREE_CODE (STRUCT) == UNION_TYPE                             \
 259         || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                       \
 260     && TARGET_ALIGN_NATURAL == 0)                                       \
 261    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)      \
 262    : MAX ((COMPUTED), (SPECIFIED)))
 263
 264 /* Use the default for compiling target libs.  */
 265 #ifdef IN_TARGET_LIBS
 266 #undef TARGET_ALIGN_NATURAL
 267 #define TARGET_ALIGN_NATURAL 1
 268 #endif
 269
 270 /* Indicate that jump tables go in the text section.  */
 271 #undef  JUMP_TABLES_IN_TEXT_SECTION
 272 #define JUMP_TABLES_IN_TEXT_SECTION TARGET_64BIT
 273
 274 /* The linux ppc64 ABI isn't explicit on whether aggregates smaller
 275    than a doubleword should be padded upward or downward.  You could
 276    reasonably assume that they follow the normal rules for structure
 277    layout treating the parameter area as any other block of memory,
 278    then map the reg param area to registers.  i.e. pad upward.
 279    Setting both of the following defines results in this behavior.
 280    Setting just the first one will result in aggregates that fit in a
 281    doubleword being padded downward, and others being padded upward.
 282    Not a bad idea as this results in struct { int x; } being passed
 283    the same way as an int.  */
 284 #define AGGREGATE_PADDING_FIXED TARGET_64BIT
 285 #define AGGREGATES_PAD_UPWARD_ALWAYS 0
 286
 287 /* Specify padding for the last element of a block move between
 288    registers and memory.  FIRST is nonzero if this is the only
 289    element.  */
 290 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 291   (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
 292
 293 /* Linux doesn't support saving and restoring 64-bit regs in a 32-bit
 294    process.  */
 295 #define OS_MISSING_POWERPC64 !TARGET_64BIT
 296
 297 #ifdef SINGLE_LIBC
 298 #define OPTION_GLIBC  (DEFAULT_LIBC == LIBC_GLIBC)
 299 #else
 300 #define OPTION_GLIBC  (linux_libc == LIBC_GLIBC)
 301 #endif
 302
 303 /* glibc has float and long double forms of math functions.  */
 304 #undef  TARGET_C99_FUNCTIONS
 305 #define TARGET_C99_FUNCTIONS (OPTION_GLIBC)
 306
 307 /* Whether we have sincos that follows the GNU extension.  */
 308 #undef  TARGET_HAS_SINCOS
 309 #define TARGET_HAS_SINCOS (OPTION_GLIBC)
 310
 311 #undef  TARGET_OS_CPP_BUILTINS
 312 #define TARGET_OS_CPP_BUILTINS()                        \
 313   do                                                    \
 314     {                                                   \
 315       if (TARGET_64BIT)                                 \
 316         {                                               \
 317           builtin_define ("__PPC__");                   \
 318           builtin_define ("__PPC64__");                 \
 319           builtin_define ("__powerpc__");               \
 320           builtin_define ("__powerpc64__");             \
 321           if (!DOT_SYMBOLS)                             \
 322             builtin_define ("_CALL_LINUX");             \
 323           builtin_assert ("cpu=powerpc64");             \
 324           builtin_assert ("machine=powerpc64");         \
 325         }                                               \
 326       else                                              \
 327         {                                               \
 328           builtin_define_std ("PPC");                   \
 329           builtin_define_std ("powerpc");               \
 330           builtin_assert ("cpu=powerpc");               \
 331           builtin_assert ("machine=powerpc");           \
 332           TARGET_OS_SYSV_CPP_BUILTINS ();               \
 333         }                                               \
 334     }                                                   \
 335   while (0)
 336
 337 #undef  CPP_OS_DEFAULT_SPEC
 338 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux)"
 339
 340 /* The GNU C++ standard library currently requires _GNU_SOURCE being
 341    defined on glibc-based systems. This temporary hack accomplishes this,
 342    it should go away as soon as libstdc++-v3 has a real fix.  */
 343 #undef  CPLUSPLUS_CPP_SPEC
 344 #define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
 345
 346 #undef  LINK_SHLIB_SPEC
 347 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
 348
 349 #undef  LIB_DEFAULT_SPEC
 350 #define LIB_DEFAULT_SPEC "%(lib_linux)"
 351
 352 #undef  STARTFILE_DEFAULT_SPEC
 353 #define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
 354
 355 #undef  ENDFILE_DEFAULT_SPEC
 356 #define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
 357
 358 #undef  LINK_START_DEFAULT_SPEC
 359 #define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
 360
 361 #undef  LINK_OS_DEFAULT_SPEC
 362 #define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
 363
 364 #define GLIBC_DYNAMIC_LINKER32 "/lib/ld.so.1"
 365 #define GLIBC_DYNAMIC_LINKER64 "/lib64/ld64.so.1"
 366 #define UCLIBC_DYNAMIC_LINKER32 "/lib/ld-uClibc.so.0"
 367 #define UCLIBC_DYNAMIC_LINKER64 "/lib/ld64-uClibc.so.0"
 368 #if DEFAULT_LIBC == LIBC_UCLIBC
 369 #define CHOOSE_DYNAMIC_LINKER(G, U) "%{mglibc:" G ";:" U "}"
 370 #elif DEFAULT_LIBC == LIBC_GLIBC
 371 #define CHOOSE_DYNAMIC_LINKER(G, U) "%{muclibc:" U ";:" G "}"
 372 #else
 373 #error "Unsupported DEFAULT_LIBC"
 374 #endif
 375 #define GNU_USER_DYNAMIC_LINKER32 \
 376   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32)
 377 #define GNU_USER_DYNAMIC_LINKER64 \
 378   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64)
 379
 380
 381 #define LINK_OS_LINUX_SPEC32 "-m elf32ppclinux %{!shared: %{!static: \
 382   %{rdynamic:-export-dynamic} \
 383   -dynamic-linker " GNU_USER_DYNAMIC_LINKER32 "}}"
 384
 385 #define LINK_OS_LINUX_SPEC64 "-m elf64ppc %{!shared: %{!static: \
 386   %{rdynamic:-export-dynamic} \
 387   -dynamic-linker " GNU_USER_DYNAMIC_LINKER64 "}}"
 388
 389 #undef  TOC_SECTION_ASM_OP
 390 #define TOC_SECTION_ASM_OP \
 391   (TARGET_64BIT                                         \
 392    ? "\t.section\t\".toc\",\"aw\""                      \
 393    : "\t.section\t\".got\",\"aw\"")
 394
 395 #undef  MINIMAL_TOC_SECTION_ASM_OP
 396 #define MINIMAL_TOC_SECTION_ASM_OP \
 397   (TARGET_64BIT                                         \
 398    ? "\t.section\t\".toc1\",\"aw\""                     \
 399    : ((TARGET_RELOCATABLE || flag_pic)                  \
 400       ? "\t.section\t\".got2\",\"aw\""                  \
 401       : "\t.section\t\".got1\",\"aw\""))
 402
 403 /* Must be at least as big as our pointer type.  */
 404 #undef  SIZE_TYPE
 405 #define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int")
 406
 407 #undef  PTRDIFF_TYPE
 408 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
 409
 410 #undef  WCHAR_TYPE
 411 #define WCHAR_TYPE (TARGET_64BIT ? "int" : "long int")
 412 #undef  WCHAR_TYPE_SIZE
 413 #define WCHAR_TYPE_SIZE 32
 414
 415 /* Override rs6000.h definition.  */
 416 #undef  ASM_APP_ON
 417 #define ASM_APP_ON "#APP\n"
 418
 419 /* Override rs6000.h definition.  */
 420 #undef  ASM_APP_OFF
 421 #define ASM_APP_OFF "#NO_APP\n"
 422
 423 #undef  RS6000_MCOUNT
 424 #define RS6000_MCOUNT "_mcount"
 425
 426 #ifdef __powerpc64__
 427 /* _init and _fini functions are built from bits spread across many
 428    object files, each potentially with a different TOC pointer.  For
 429    that reason, place a nop after the call so that the linker can
 430    restore the TOC pointer if a TOC adjusting call stub is needed.  */
 431 #if DOT_SYMBOLS
 432 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 433   asm (SECTION_OP "\n"                                  \
 434 "       bl ." #FUNC "\n"                                \
 435 "       nop\n"                                          \
 436 "       .previous");
 437 #else
 438 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 439   asm (SECTION_OP "\n"                                  \
 440 "       bl " #FUNC "\n"                                 \
 441 "       nop\n"                                          \
 442 "       .previous");
 443 #endif
 444 #endif
 445
 446 /* FP save and restore routines.  */
 447 #undef  SAVE_FP_PREFIX
 448 #define SAVE_FP_PREFIX (TARGET_64BIT ? "._savef" : "_savefpr_")
 449 #undef  SAVE_FP_SUFFIX
 450 #define SAVE_FP_SUFFIX ""
 451 #undef  RESTORE_FP_PREFIX
 452 #define RESTORE_FP_PREFIX (TARGET_64BIT ? "._restf" : "_restfpr_")
 453 #undef  RESTORE_FP_SUFFIX
 454 #define RESTORE_FP_SUFFIX ""
 455
 456 /* Dwarf2 debugging.  */
 457 #undef  PREFERRED_DEBUGGING_TYPE
 458 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 459
 460 /* This is how to declare the size of a function.  */
 461 #undef  ASM_DECLARE_FUNCTION_SIZE
 462 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 463   do                                                                    \
 464     {                                                                   \
 465       if (!flag_inhibit_size_directive)                                 \
 466         {                                                               \
 467           fputs ("\t.size\t", (FILE));                                  \
 468           if (TARGET_64BIT && DOT_SYMBOLS)                              \
 469             putc ('.', (FILE));                                         \
 470           assemble_name ((FILE), (FNAME));                              \
 471           fputs (",.-", (FILE));                                        \
 472           rs6000_output_function_entry (FILE, FNAME);                   \
 473           putc ('\n', (FILE));                                          \
 474         }                                                               \
 475     }                                                                   \
 476   while (0)
 477
 478 /* Return nonzero if this entry is to be written into the constant
 479    pool in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF
 480    or a CONST containing one of them.  If -mfp-in-toc (the default),
 481    we also do this for floating-point constants.  We actually can only
 482    do this if the FP formats of the target and host machines are the
 483    same, but we can't check that since not every file that uses
 484    the macros includes real.h.  We also do this when we can write the
 485    entry into the TOC and the entry is not larger than a TOC entry.  */
 486
 487 #undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
 488 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
 489   (TARGET_TOC                                                           \
 490    && (GET_CODE (X) == SYMBOL_REF                                       \
 491        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
 492            && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)           \
 493        || GET_CODE (X) == LABEL_REF                                     \
 494        || (GET_CODE (X) == CONST_INT                                    \
 495            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
 496        || (GET_CODE (X) == CONST_DOUBLE                                 \
 497            && ((TARGET_64BIT                                            \
 498                 && (TARGET_MINIMAL_TOC                                  \
 499                     || (SCALAR_FLOAT_MODE_P (GET_MODE (X))              \
 500                         && ! TARGET_NO_FP_IN_TOC)))                     \
 501                || (!TARGET_64BIT                                        \
 502                    && !TARGET_NO_FP_IN_TOC                              \
 503                    && !TARGET_RELOCATABLE                               \
 504                    && SCALAR_FLOAT_MODE_P (GET_MODE (X))                \
 505                    && BITS_PER_WORD == HOST_BITS_PER_INT)))))
 506
 507 /* Select a format to encode pointers in exception handling data.  CODE
 508    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
 509    true if the symbol may be affected by dynamic relocations.  */
 510 #undef  ASM_PREFERRED_EH_DATA_FORMAT
 511 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 512   ((TARGET_64BIT || flag_pic || TARGET_RELOCATABLE)                     \
 513    ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel               \
 514       | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4))             \
 515    : DW_EH_PE_absptr)
 516
 517 /* For backward compatibility, we must continue to use the AIX
 518    structure return convention.  */
 519 #undef DRAFT_V4_STRUCT_RET
 520 #define DRAFT_V4_STRUCT_RET (!TARGET_64BIT)
 521
 522 #define TARGET_POSIX_IO
 523
 524 #define LINK_GCC_C_SEQUENCE_SPEC \
 525   "%{static:--start-group} %G %L %{static:--end-group}%{!static:%G}"
 526
 527 /* Use --as-needed -lgcc_s for eh support.  */
 528 #ifdef HAVE_LD_AS_NEEDED
 529 #define USE_LD_AS_NEEDED 1
 530 #endif
 531
 532 #ifdef TARGET_LIBC_PROVIDES_SSP
 533 /* ppc32 glibc provides __stack_chk_guard in -0x7008(2),
 534    ppc64 glibc provides it at -0x7010(13).  */
 535 #define TARGET_THREAD_SSP_OFFSET        (TARGET_64BIT ? -0x7010 : -0x7008)
 536 #endif
 537
 538 #define POWERPC_LINUX
 539
 540 /* ppc{32,64} linux has 128-bit long double support in glibc 2.4 and later.  */
 541 #ifdef TARGET_DEFAULT_LONG_DOUBLE_128
 542 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
 543 #endif
 544
 545 /* Static stack checking is supported by means of probes.  */
 546 #define STACK_CHECK_STATIC_BUILTIN 1
 547
 548 /* The default value isn't sufficient in 64-bit mode.  */
 549 #define STACK_CHECK_PROTECT (TARGET_64BIT ? 16 * 1024 : 12 * 1024)