gcc/config/rs6000/linux64.h

   1 /* Definitions of target machine for GNU compiler,
   2    for 64 bit PowerPC linux.
   3    Copyright (C) 2000-2013 Free Software Foundation, Inc.
   4
   5    This file is part of GCC.
   6
   7    GCC is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU General Public License as published
   9    by the Free Software Foundation; either version 3, or (at your
  10    option) any later version.
  11
  12    GCC is distributed in the hope that it will be useful, but WITHOUT
  13    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  15    License for more details.
  16
  17    Under Section 7 of GPL version 3, you are granted additional
  18    permissions described in the GCC Runtime Library Exception, version
  19    3.1, as published by the Free Software Foundation.
  20
  21    You should have received a copy of the GNU General Public License and
  22    a copy of the GCC Runtime Library Exception along with this program;
  23    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24    <http://www.gnu.org/licenses/>.  */
  25
  26 #ifndef RS6000_BI_ARCH
  27
  28 #undef  DEFAULT_ABI
  29 #define DEFAULT_ABI ABI_AIX
  30
  31 #undef  TARGET_64BIT
  32 #define TARGET_64BIT 1
  33
  34 #define DEFAULT_ARCH64_P 1
  35 #define RS6000_BI_ARCH_P 0
  36
  37 #else
  38
  39 #define DEFAULT_ARCH64_P (TARGET_DEFAULT & MASK_64BIT)
  40 #define RS6000_BI_ARCH_P 1
  41
  42 #endif
  43
  44 #ifdef IN_LIBGCC2
  45 #undef TARGET_64BIT
  46 #ifdef __powerpc64__
  47 #define TARGET_64BIT 1
  48 #else
  49 #define TARGET_64BIT 0
  50 #endif
  51 #endif
  52
  53 #undef  TARGET_AIX
  54 #define TARGET_AIX TARGET_64BIT
  55
  56 #ifdef HAVE_LD_NO_DOT_SYMS
  57 /* New ABI uses a local sym for the function entry point.  */
  58 extern int dot_symbols;
  59 #undef DOT_SYMBOLS
  60 #define DOT_SYMBOLS dot_symbols
  61 #endif
  62
  63 #define TARGET_PROFILE_KERNEL profile_kernel
  64
  65 #define TARGET_USES_LINUX64_OPT 1
  66 #ifdef HAVE_LD_LARGE_TOC
  67 #undef TARGET_CMODEL
  68 #define TARGET_CMODEL rs6000_current_cmodel
  69 #define SET_CMODEL(opt) rs6000_current_cmodel = opt
  70 #else
  71 #define SET_CMODEL(opt) do {} while (0)
  72 #endif
  73
  74 #undef  PROCESSOR_DEFAULT
  75 #define PROCESSOR_DEFAULT PROCESSOR_POWER7
  76 #undef  PROCESSOR_DEFAULT64
  77 #define PROCESSOR_DEFAULT64 PROCESSOR_POWER7
  78
  79 /* We don't need to generate entries in .fixup, except when
  80    -mrelocatable or -mrelocatable-lib is given.  */
  81 #undef RELOCATABLE_NEEDS_FIXUP
  82 #define RELOCATABLE_NEEDS_FIXUP \
  83   (rs6000_isa_flags & rs6000_isa_flags_explicit & OPTION_MASK_RELOCATABLE)
  84
  85 #undef  RS6000_ABI_NAME
  86 #define RS6000_ABI_NAME "linux"
  87
  88 #define INVALID_64BIT "-m%s not supported in this configuration"
  89 #define INVALID_32BIT INVALID_64BIT
  90
  91 #undef  SUBSUBTARGET_OVERRIDE_OPTIONS
  92 #define SUBSUBTARGET_OVERRIDE_OPTIONS                           \
  93   do                                                            \
  94     {                                                           \
  95       if (!global_options_set.x_rs6000_alignment_flags)         \
  96         rs6000_alignment_flags = MASK_ALIGN_NATURAL;            \
  97       if (TARGET_64BIT)                                         \
  98         {                                                       \
  99           if (DEFAULT_ABI != ABI_AIX)                           \
 100             {                                                   \
 101               rs6000_current_abi = ABI_AIX;                     \
 102               error (INVALID_64BIT, "call");                    \
 103             }                                                   \
 104           dot_symbols = !strcmp (rs6000_abi_name, "aixdesc");   \
 105           if (rs6000_isa_flags & OPTION_MASK_RELOCATABLE)       \
 106             {                                                   \
 107               rs6000_isa_flags &= ~OPTION_MASK_RELOCATABLE;     \
 108               error (INVALID_64BIT, "relocatable");             \
 109             }                                                   \
 110           if (rs6000_isa_flags & OPTION_MASK_EABI)              \
 111             {                                                   \
 112               rs6000_isa_flags &= ~OPTION_MASK_EABI;            \
 113               error (INVALID_64BIT, "eabi");                    \
 114             }                                                   \
 115           if (TARGET_PROTOTYPE)                                 \
 116             {                                                   \
 117               target_prototype = 0;                             \
 118               error (INVALID_64BIT, "prototype");               \
 119             }                                                   \
 120           if ((rs6000_isa_flags & OPTION_MASK_POWERPC64) == 0)  \
 121             {                                                   \
 122               rs6000_isa_flags |= OPTION_MASK_POWERPC64;        \
 123               error ("-m64 requires a PowerPC64 cpu");          \
 124             }                                                   \
 125           if ((rs6000_isa_flags_explicit                        \
 126                & OPTION_MASK_MINIMAL_TOC) != 0)                 \
 127             {                                                   \
 128               if (global_options_set.x_rs6000_current_cmodel    \
 129                   && rs6000_current_cmodel != CMODEL_SMALL)     \
 130                 error ("-mcmodel incompatible with other toc options"); \
 131               SET_CMODEL (CMODEL_SMALL);                        \
 132             }                                                   \
 133           else                                                  \
 134             {                                                   \
 135               if (!global_options_set.x_rs6000_current_cmodel)  \
 136                 SET_CMODEL (CMODEL_MEDIUM);                     \
 137               if (rs6000_current_cmodel != CMODEL_SMALL)        \
 138                 {                                               \
 139                   if (!global_options_set.x_TARGET_NO_FP_IN_TOC) \
 140                     TARGET_NO_FP_IN_TOC                         \
 141                       = rs6000_current_cmodel == CMODEL_MEDIUM; \
 142                   if (!global_options_set.x_TARGET_NO_SUM_IN_TOC) \
 143                     TARGET_NO_SUM_IN_TOC = 0;                   \
 144                 }                                               \
 145             }                                                   \
 146         }                                                       \
 147       else                                                      \
 148         {                                                       \
 149           if (!RS6000_BI_ARCH_P)                                \
 150             error (INVALID_32BIT, "32");                        \
 151           if (TARGET_PROFILE_KERNEL)                            \
 152             {                                                   \
 153               TARGET_PROFILE_KERNEL = 0;                        \
 154               error (INVALID_32BIT, "profile-kernel");          \
 155             }                                                   \
 156           if (global_options_set.x_rs6000_current_cmodel)       \
 157             {                                                   \
 158               SET_CMODEL (CMODEL_SMALL);                        \
 159               error (INVALID_32BIT, "cmodel");                  \
 160             }                                                   \
 161         }                                                       \
 162     }                                                           \
 163   while (0)
 164
 165 #undef  ASM_DEFAULT_SPEC
 166 #undef  ASM_SPEC
 167 #undef  LINK_OS_LINUX_SPEC
 168
 169 #ifndef RS6000_BI_ARCH
 170 #define ASM_DEFAULT_SPEC "-mppc64"
 171 #define ASM_SPEC         "%(asm_spec64) %(asm_spec_common)"
 172 #define LINK_OS_LINUX_SPEC "%(link_os_linux_spec64)"
 173 #else
 174 #if DEFAULT_ARCH64_P
 175 #define ASM_DEFAULT_SPEC "-mppc%{!m32:64}"
 176 #define ASM_SPEC         "%{m32:%(asm_spec32)}%{!m32:%(asm_spec64)} %(asm_spec_common)"
 177 #define LINK_OS_LINUX_SPEC "%{m32:%(link_os_linux_spec32)}%{!m32:%(link_os_linux_spec64)}"
 178 #else
 179 #define ASM_DEFAULT_SPEC "-mppc%{m64:64}"
 180 #define ASM_SPEC         "%{!m64:%(asm_spec32)}%{m64:%(asm_spec64)} %(asm_spec_common)"
 181 #define LINK_OS_LINUX_SPEC "%{!m64:%(link_os_linux_spec32)}%{m64:%(link_os_linux_spec64)}"
 182 #endif
 183 #endif
 184
 185 #define ASM_SPEC32 "-a32 \
 186 %{mrelocatable} %{mrelocatable-lib} %{fpic|fpie|fPIC|fPIE:-K PIC} \
 187 %{memb|msdata=eabi: -memb}"
 188
 189 #define ASM_SPEC64 "-a64"
 190
 191 #define ASM_SPEC_COMMON "%(asm_cpu) \
 192 %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}}" \
 193   ENDIAN_SELECT(" -mbig", " -mlittle", DEFAULT_ASM_ENDIAN)
 194
 195 #undef  SUBSUBTARGET_EXTRA_SPECS
 196 #define SUBSUBTARGET_EXTRA_SPECS \
 197   { "asm_spec_common",          ASM_SPEC_COMMON },                      \
 198   { "asm_spec32",               ASM_SPEC32 },                           \
 199   { "asm_spec64",               ASM_SPEC64 },                           \
 200   { "link_os_linux_spec32",     LINK_OS_LINUX_SPEC32 },                 \
 201   { "link_os_linux_spec64",     LINK_OS_LINUX_SPEC64 },
 202
 203 #undef  MULTILIB_DEFAULTS
 204 #if DEFAULT_ARCH64_P
 205 #define MULTILIB_DEFAULTS { "m64" }
 206 #else
 207 #define MULTILIB_DEFAULTS { "m32" }
 208 #endif
 209
 210 #ifndef RS6000_BI_ARCH
 211
 212 /* 64-bit PowerPC Linux always has a TOC.  */
 213 #undef  TARGET_TOC
 214 #define TARGET_TOC              1
 215
 216 /* Some things from sysv4.h we don't do when 64 bit.  */
 217 #undef  OPTION_RELOCATABLE
 218 #define OPTION_RELOCATABLE      0
 219 #undef  OPTION_EABI
 220 #define OPTION_EABI             0
 221 #undef  OPTION_PROTOTYPE
 222 #define OPTION_PROTOTYPE        0
 223 #undef RELOCATABLE_NEEDS_FIXUP
 224 #define RELOCATABLE_NEEDS_FIXUP 0
 225
 226 #endif
 227
 228 /* We use glibc _mcount for profiling.  */
 229 #define NO_PROFILE_COUNTERS 1
 230 #define PROFILE_HOOK(LABEL) \
 231   do { if (TARGET_64BIT) output_profile_hook (LABEL); } while (0)
 232
 233 /* PowerPC64 Linux word-aligns FP doubles when -malign-power is given.  */
 234 #undef  ADJUST_FIELD_ALIGN
 235 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
 236   ((TARGET_ALTIVEC && TREE_CODE (TREE_TYPE (FIELD)) == VECTOR_TYPE)     \
 237    ? 128                                                                \
 238    : (TARGET_64BIT                                                      \
 239       && TARGET_ALIGN_NATURAL == 0                                      \
 240       && TYPE_MODE (strip_array_types (TREE_TYPE (FIELD))) == DFmode)   \
 241    ? MIN ((COMPUTED), 32)                                               \
 242    : (COMPUTED))
 243
 244 /* PowerPC64 Linux increases natural record alignment to doubleword if
 245    the first field is an FP double, only if in power alignment mode.  */
 246 #undef  ROUND_TYPE_ALIGN
 247 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                   \
 248   ((TARGET_64BIT                                                        \
 249     && (TREE_CODE (STRUCT) == RECORD_TYPE                               \
 250         || TREE_CODE (STRUCT) == UNION_TYPE                             \
 251         || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                       \
 252     && TARGET_ALIGN_NATURAL == 0)                                       \
 253    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)      \
 254    : MAX ((COMPUTED), (SPECIFIED)))
 255
 256 /* Use the default for compiling target libs.  */
 257 #ifdef IN_TARGET_LIBS
 258 #undef TARGET_ALIGN_NATURAL
 259 #define TARGET_ALIGN_NATURAL 1
 260 #endif
 261
 262 /* Indicate that jump tables go in the text section.  */
 263 #undef  JUMP_TABLES_IN_TEXT_SECTION
 264 #define JUMP_TABLES_IN_TEXT_SECTION TARGET_64BIT
 265
 266 /* The linux ppc64 ABI isn't explicit on whether aggregates smaller
 267    than a doubleword should be padded upward or downward.  You could
 268    reasonably assume that they follow the normal rules for structure
 269    layout treating the parameter area as any other block of memory,
 270    then map the reg param area to registers.  i.e. pad upward.
 271    Setting both of the following defines results in this behavior.
 272    Setting just the first one will result in aggregates that fit in a
 273    doubleword being padded downward, and others being padded upward.
 274    Not a bad idea as this results in struct { int x; } being passed
 275    the same way as an int.  */
 276 #define AGGREGATE_PADDING_FIXED TARGET_64BIT
 277 #define AGGREGATES_PAD_UPWARD_ALWAYS 0
 278
 279 /* Specify padding for the last element of a block move between
 280    registers and memory.  FIRST is nonzero if this is the only
 281    element.  */
 282 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 283   (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
 284
 285 /* Linux doesn't support saving and restoring 64-bit regs in a 32-bit
 286    process.  */
 287 #define OS_MISSING_POWERPC64 !TARGET_64BIT
 288
 289 #ifdef SINGLE_LIBC
 290 #define OPTION_GLIBC  (DEFAULT_LIBC == LIBC_GLIBC)
 291 #define OPTION_UCLIBC (DEFAULT_LIBC == LIBC_UCLIBC)
 292 #define OPTION_BIONIC (DEFAULT_LIBC == LIBC_BIONIC)
 293 #else
 294 #define OPTION_GLIBC  (linux_libc == LIBC_GLIBC)
 295 #define OPTION_UCLIBC (linux_libc == LIBC_UCLIBC)
 296 #define OPTION_BIONIC (linux_libc == LIBC_BIONIC)
 297 #endif
 298
 299 /* Determine what functions are present at the runtime;
 300    this includes full c99 runtime and sincos.  */
 301 #undef TARGET_LIBC_HAS_FUNCTION
 302 #define TARGET_LIBC_HAS_FUNCTION linux_android_libc_has_function
 303
 304 #undef  TARGET_OS_CPP_BUILTINS
 305 #define TARGET_OS_CPP_BUILTINS()                        \
 306   do                                                    \
 307     {                                                   \
 308       if (TARGET_64BIT)                                 \
 309         {                                               \
 310           builtin_define ("__PPC__");                   \
 311           builtin_define ("__PPC64__");                 \
 312           builtin_define ("__powerpc__");               \
 313           builtin_define ("__powerpc64__");             \
 314           if (!DOT_SYMBOLS)                             \
 315             builtin_define ("_CALL_LINUX");             \
 316           builtin_assert ("cpu=powerpc64");             \
 317           builtin_assert ("machine=powerpc64");         \
 318         }                                               \
 319       else                                              \
 320         {                                               \
 321           builtin_define_std ("PPC");                   \
 322           builtin_define_std ("powerpc");               \
 323           builtin_assert ("cpu=powerpc");               \
 324           builtin_assert ("machine=powerpc");           \
 325           TARGET_OS_SYSV_CPP_BUILTINS ();               \
 326         }                                               \
 327     }                                                   \
 328   while (0)
 329
 330 #undef  CPP_OS_DEFAULT_SPEC
 331 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux)"
 332
 333 /* The GNU C++ standard library currently requires _GNU_SOURCE being
 334    defined on glibc-based systems. This temporary hack accomplishes this,
 335    it should go away as soon as libstdc++-v3 has a real fix.  */
 336 #undef  CPLUSPLUS_CPP_SPEC
 337 #define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
 338
 339 #undef  LINK_SHLIB_SPEC
 340 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
 341
 342 #undef  LIB_DEFAULT_SPEC
 343 #define LIB_DEFAULT_SPEC "%(lib_linux)"
 344
 345 #undef  STARTFILE_DEFAULT_SPEC
 346 #define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
 347
 348 #undef  ENDFILE_DEFAULT_SPEC
 349 #define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
 350
 351 #undef  LINK_START_DEFAULT_SPEC
 352 #define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
 353
 354 #undef  LINK_OS_DEFAULT_SPEC
 355 #define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
 356
 357 #define GLIBC_DYNAMIC_LINKER32 "/lib/ld.so.1"
 358 #define GLIBC_DYNAMIC_LINKER64 "/lib64/ld64.so.1"
 359 #define UCLIBC_DYNAMIC_LINKER32 "/lib/ld-uClibc.so.0"
 360 #define UCLIBC_DYNAMIC_LINKER64 "/lib/ld64-uClibc.so.0"
 361 #if DEFAULT_LIBC == LIBC_UCLIBC
 362 #define CHOOSE_DYNAMIC_LINKER(G, U) "%{mglibc:" G ";:" U "}"
 363 #elif DEFAULT_LIBC == LIBC_GLIBC
 364 #define CHOOSE_DYNAMIC_LINKER(G, U) "%{muclibc:" U ";:" G "}"
 365 #else
 366 #error "Unsupported DEFAULT_LIBC"
 367 #endif
 368 #define GNU_USER_DYNAMIC_LINKER32 \
 369   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32)
 370 #define GNU_USER_DYNAMIC_LINKER64 \
 371   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64)
 372
 373 #undef  DEFAULT_ASM_ENDIAN
 374 #if (TARGET_DEFAULT & MASK_LITTLE_ENDIAN)
 375 #define DEFAULT_ASM_ENDIAN " -mlittle"
 376 #define LINK_OS_LINUX_EMUL32 ENDIAN_SELECT(" -m elf32ppclinux",         \
 377                                            " -m elf32lppclinux",        \
 378                                            " -m elf32lppclinux")
 379 #define LINK_OS_LINUX_EMUL64 ENDIAN_SELECT(" -m elf64ppc",              \
 380                                            " -m elf64lppc",             \
 381                                            " -m elf64lppc")
 382 #else
 383 #define DEFAULT_ASM_ENDIAN " -mbig"
 384 #define LINK_OS_LINUX_EMUL32 ENDIAN_SELECT(" -m elf32ppclinux",         \
 385                                            " -m elf32lppclinux",        \
 386                                            " -m elf32ppclinux")
 387 #define LINK_OS_LINUX_EMUL64 ENDIAN_SELECT(" -m elf64ppc",              \
 388                                            " -m elf64lppc",             \
 389                                            " -m elf64ppc")
 390 #endif
 391
 392 #define LINK_OS_LINUX_SPEC32 LINK_OS_LINUX_EMUL32 " %{!shared: %{!static: \
 393   %{rdynamic:-export-dynamic} \
 394   -dynamic-linker " GNU_USER_DYNAMIC_LINKER32 "}}"
 395
 396 #define LINK_OS_LINUX_SPEC64 LINK_OS_LINUX_EMUL64 " %{!shared: %{!static: \
 397   %{rdynamic:-export-dynamic} \
 398   -dynamic-linker " GNU_USER_DYNAMIC_LINKER64 "}}"
 399
 400 #undef  TOC_SECTION_ASM_OP
 401 #define TOC_SECTION_ASM_OP \
 402   (TARGET_64BIT                                         \
 403    ? "\t.section\t\".toc\",\"aw\""                      \
 404    : "\t.section\t\".got\",\"aw\"")
 405
 406 #undef  MINIMAL_TOC_SECTION_ASM_OP
 407 #define MINIMAL_TOC_SECTION_ASM_OP \
 408   (TARGET_64BIT                                         \
 409    ? "\t.section\t\".toc1\",\"aw\""                     \
 410    : ((TARGET_RELOCATABLE || flag_pic)                  \
 411       ? "\t.section\t\".got2\",\"aw\""                  \
 412       : "\t.section\t\".got1\",\"aw\""))
 413
 414 /* Must be at least as big as our pointer type.  */
 415 #undef  SIZE_TYPE
 416 #define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int")
 417
 418 #undef  PTRDIFF_TYPE
 419 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
 420
 421 #undef  WCHAR_TYPE
 422 #define WCHAR_TYPE (TARGET_64BIT ? "int" : "long int")
 423 #undef  WCHAR_TYPE_SIZE
 424 #define WCHAR_TYPE_SIZE 32
 425
 426 /* Override rs6000.h definition.  */
 427 #undef  ASM_APP_ON
 428 #define ASM_APP_ON "#APP\n"
 429
 430 /* Override rs6000.h definition.  */
 431 #undef  ASM_APP_OFF
 432 #define ASM_APP_OFF "#NO_APP\n"
 433
 434 #undef  RS6000_MCOUNT
 435 #define RS6000_MCOUNT "_mcount"
 436
 437 #ifdef __powerpc64__
 438 /* _init and _fini functions are built from bits spread across many
 439    object files, each potentially with a different TOC pointer.  For
 440    that reason, place a nop after the call so that the linker can
 441    restore the TOC pointer if a TOC adjusting call stub is needed.  */
 442 #if DOT_SYMBOLS
 443 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 444   asm (SECTION_OP "\n"                                  \
 445 "       bl ." #FUNC "\n"                                \
 446 "       nop\n"                                          \
 447 "       .previous");
 448 #else
 449 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 450   asm (SECTION_OP "\n"                                  \
 451 "       bl " #FUNC "\n"                                 \
 452 "       nop\n"                                          \
 453 "       .previous");
 454 #endif
 455 #endif
 456
 457 /* FP save and restore routines.  */
 458 #undef  SAVE_FP_PREFIX
 459 #define SAVE_FP_PREFIX (TARGET_64BIT ? "._savef" : "_savefpr_")
 460 #undef  SAVE_FP_SUFFIX
 461 #define SAVE_FP_SUFFIX ""
 462 #undef  RESTORE_FP_PREFIX
 463 #define RESTORE_FP_PREFIX (TARGET_64BIT ? "._restf" : "_restfpr_")
 464 #undef  RESTORE_FP_SUFFIX
 465 #define RESTORE_FP_SUFFIX ""
 466
 467 /* Dwarf2 debugging.  */
 468 #undef  PREFERRED_DEBUGGING_TYPE
 469 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 470
 471 /* This is how to declare the size of a function.  */
 472 #undef  ASM_DECLARE_FUNCTION_SIZE
 473 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 474   do                                                                    \
 475     {                                                                   \
 476       if (!flag_inhibit_size_directive)                                 \
 477         {                                                               \
 478           fputs ("\t.size\t", (FILE));                                  \
 479           if (TARGET_64BIT && DOT_SYMBOLS)                              \
 480             putc ('.', (FILE));                                         \
 481           assemble_name ((FILE), (FNAME));                              \
 482           fputs (",.-", (FILE));                                        \
 483           rs6000_output_function_entry (FILE, FNAME);                   \
 484           putc ('\n', (FILE));                                          \
 485         }                                                               \
 486     }                                                                   \
 487   while (0)
 488
 489 /* Return nonzero if this entry is to be written into the constant
 490    pool in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF
 491    or a CONST containing one of them.  If -mfp-in-toc (the default),
 492    we also do this for floating-point constants.  We actually can only
 493    do this if the FP formats of the target and host machines are the
 494    same, but we can't check that since not every file that uses
 495    the macros includes real.h.  We also do this when we can write the
 496    entry into the TOC and the entry is not larger than a TOC entry.  */
 497
 498 #undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
 499 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
 500   (TARGET_TOC                                                           \
 501    && (GET_CODE (X) == SYMBOL_REF                                       \
 502        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
 503            && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)           \
 504        || GET_CODE (X) == LABEL_REF                                     \
 505        || (GET_CODE (X) == CONST_INT                                    \
 506            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
 507        || (GET_CODE (X) == CONST_DOUBLE                                 \
 508            && ((TARGET_64BIT                                            \
 509                 && (TARGET_MINIMAL_TOC                                  \
 510                     || (SCALAR_FLOAT_MODE_P (GET_MODE (X))              \
 511                         && ! TARGET_NO_FP_IN_TOC)))                     \
 512                || (!TARGET_64BIT                                        \
 513                    && !TARGET_NO_FP_IN_TOC                              \
 514                    && !TARGET_RELOCATABLE                               \
 515                    && SCALAR_FLOAT_MODE_P (GET_MODE (X))                \
 516                    && BITS_PER_WORD == HOST_BITS_PER_INT)))))
 517
 518 /* Select a format to encode pointers in exception handling data.  CODE
 519    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
 520    true if the symbol may be affected by dynamic relocations.  */
 521 #undef  ASM_PREFERRED_EH_DATA_FORMAT
 522 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 523   ((TARGET_64BIT || flag_pic || TARGET_RELOCATABLE)                     \
 524    ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel               \
 525       | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4))             \
 526    : DW_EH_PE_absptr)
 527
 528 /* For backward compatibility, we must continue to use the AIX
 529    structure return convention.  */
 530 #undef DRAFT_V4_STRUCT_RET
 531 #define DRAFT_V4_STRUCT_RET (!TARGET_64BIT)
 532
 533 #define TARGET_POSIX_IO
 534
 535 #define LINK_GCC_C_SEQUENCE_SPEC \
 536   "%{static:--start-group} %G %L %{static:--end-group}%{!static:%G}"
 537
 538 /* Use --as-needed -lgcc_s for eh support.  */
 539 #ifdef HAVE_LD_AS_NEEDED
 540 #define USE_LD_AS_NEEDED 1
 541 #endif
 542
 543 #ifdef TARGET_LIBC_PROVIDES_SSP
 544 /* ppc32 glibc provides __stack_chk_guard in -0x7008(2),
 545    ppc64 glibc provides it at -0x7010(13).  */
 546 #define TARGET_THREAD_SSP_OFFSET        (TARGET_64BIT ? -0x7010 : -0x7008)
 547 #endif
 548
 549 #define POWERPC_LINUX
 550
 551 /* ppc{32,64} linux has 128-bit long double support in glibc 2.4 and later.  */
 552 #ifdef TARGET_DEFAULT_LONG_DOUBLE_128
 553 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
 554 #endif
 555
 556 /* Static stack checking is supported by means of probes.  */
 557 #define STACK_CHECK_STATIC_BUILTIN 1
 558
 559 /* The default value isn't sufficient in 64-bit mode.  */
 560 #define STACK_CHECK_PROTECT (TARGET_64BIT ? 16 * 1024 : 12 * 1024)