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