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
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GCC.
   7
   8    GCC is free software; you can redistribute it and/or modify it
   9    under the terms of the GNU General Public License as published
  10    by the Free Software Foundation; either version 2, or (at your
  11    option) any later version.
  12
  13    GCC is distributed in the hope that it will be useful, but WITHOUT
  14    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  16    License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with GCC; see the file COPYING.  If not, write to the
  20    Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
  21    MA 02110-1301, USA.  */
  22
  23 #ifndef RS6000_BI_ARCH
  24
  25 #undef  DEFAULT_ABI
  26 #define DEFAULT_ABI ABI_AIX
  27
  28 #undef  TARGET_64BIT
  29 #define TARGET_64BIT 1
  30
  31 #define DEFAULT_ARCH64_P 1
  32 #define RS6000_BI_ARCH_P 0
  33
  34 #else
  35
  36 #define DEFAULT_ARCH64_P (TARGET_DEFAULT & MASK_64BIT)
  37 #define RS6000_BI_ARCH_P 1
  38
  39 #endif
  40
  41 #ifdef IN_LIBGCC2
  42 #undef TARGET_64BIT
  43 #ifdef __powerpc64__
  44 #define TARGET_64BIT 1
  45 #else
  46 #define TARGET_64BIT 0
  47 #endif
  48 #endif
  49
  50 #undef  TARGET_AIX
  51 #define TARGET_AIX TARGET_64BIT
  52
  53 #ifdef HAVE_LD_NO_DOT_SYMS
  54 /* New ABI uses a local sym for the function entry point.  */
  55 extern int dot_symbols;
  56 #undef DOT_SYMBOLS
  57 #define DOT_SYMBOLS dot_symbols
  58 #endif
  59
  60 #undef  PROCESSOR_DEFAULT
  61 #define PROCESSOR_DEFAULT PROCESSOR_POWER6
  62 #undef  PROCESSOR_DEFAULT64
  63 #define PROCESSOR_DEFAULT64 PROCESSOR_POWER6
  64
  65 /* We don't need to generate entries in .fixup, except when
  66    -mrelocatable or -mrelocatable-lib is given.  */
  67 #undef RELOCATABLE_NEEDS_FIXUP
  68 #define RELOCATABLE_NEEDS_FIXUP \
  69   (target_flags & target_flags_explicit & MASK_RELOCATABLE)
  70
  71 #undef  RS6000_ABI_NAME
  72 #define RS6000_ABI_NAME "linux"
  73
  74 #define INVALID_64BIT "-m%s not supported in this configuration"
  75 #define INVALID_32BIT INVALID_64BIT
  76
  77 #undef  SUBSUBTARGET_OVERRIDE_OPTIONS
  78 #define SUBSUBTARGET_OVERRIDE_OPTIONS                           \
  79   do                                                            \
  80     {                                                           \
  81       if (!rs6000_explicit_options.alignment)                   \
  82         rs6000_alignment_flags = MASK_ALIGN_NATURAL;            \
  83       if (TARGET_64BIT)                                         \
  84         {                                                       \
  85           if (DEFAULT_ABI != ABI_AIX)                           \
  86             {                                                   \
  87               rs6000_current_abi = ABI_AIX;                     \
  88               error (INVALID_64BIT, "call");                    \
  89             }                                                   \
  90           dot_symbols = !strcmp (rs6000_abi_name, "aixdesc");   \
  91           if (target_flags & MASK_RELOCATABLE)                  \
  92             {                                                   \
  93               target_flags &= ~MASK_RELOCATABLE;                \
  94               error (INVALID_64BIT, "relocatable");             \
  95             }                                                   \
  96           if (target_flags & MASK_EABI)                         \
  97             {                                                   \
  98               target_flags &= ~MASK_EABI;                       \
  99               error (INVALID_64BIT, "eabi");                    \
 100             }                                                   \
 101           if (target_flags & MASK_PROTOTYPE)                    \
 102             {                                                   \
 103               target_flags &= ~MASK_PROTOTYPE;                  \
 104               error (INVALID_64BIT, "prototype");               \
 105             }                                                   \
 106           if ((target_flags & MASK_POWERPC64) == 0)             \
 107             {                                                   \
 108               target_flags |= MASK_POWERPC64;                   \
 109               error ("-m64 requires a PowerPC64 cpu");          \
 110             }                                                   \
 111         }                                                       \
 112       else                                                      \
 113         {                                                       \
 114           if (!RS6000_BI_ARCH_P)                                \
 115             error (INVALID_32BIT, "32");                        \
 116           if (TARGET_PROFILE_KERNEL)                            \
 117             {                                                   \
 118               target_flags &= ~MASK_PROFILE_KERNEL;             \
 119               error (INVALID_32BIT, "profile-kernel");          \
 120             }                                                   \
 121         }                                                       \
 122     }                                                           \
 123   while (0)
 124
 125 #ifdef  RS6000_BI_ARCH
 126
 127 #undef  OVERRIDE_OPTIONS
 128 #define OVERRIDE_OPTIONS \
 129   rs6000_override_options (((TARGET_DEFAULT ^ target_flags) & MASK_64BIT) \
 130                            ? (char *) 0 : TARGET_CPU_DEFAULT)
 131
 132 #endif
 133
 134 #undef  ASM_DEFAULT_SPEC
 135 #undef  ASM_SPEC
 136 #undef  LINK_OS_LINUX_SPEC
 137
 138 #ifndef RS6000_BI_ARCH
 139 #define ASM_DEFAULT_SPEC "-mppc64"
 140 #define ASM_SPEC         "%(asm_spec64) %(asm_spec_common)"
 141 #define LINK_OS_LINUX_SPEC "%(link_os_linux_spec64)"
 142 #else
 143 #if DEFAULT_ARCH64_P
 144 #define ASM_DEFAULT_SPEC "-mppc%{!m32:64}"
 145 #define ASM_SPEC         "%{m32:%(asm_spec32)}%{!m32:%(asm_spec64)} %(asm_spec_common)"
 146 #define LINK_OS_LINUX_SPEC "%{m32:%(link_os_linux_spec32)}%{!m32:%(link_os_linux_spec64)}"
 147 #else
 148 #define ASM_DEFAULT_SPEC "-mppc%{m64:64}"
 149 #define ASM_SPEC         "%{!m64:%(asm_spec32)}%{m64:%(asm_spec64)} %(asm_spec_common)"
 150 #define LINK_OS_LINUX_SPEC "%{!m64:%(link_os_linux_spec32)}%{m64:%(link_os_linux_spec64)}"
 151 #endif
 152 #endif
 153
 154 #define ASM_SPEC32 "-a32 %{n} %{T} %{Ym,*} %{Yd,*} \
 155 %{mrelocatable} %{mrelocatable-lib} %{fpic:-K PIC} %{fPIC:-K PIC} \
 156 %{memb} %{!memb: %{msdata: -memb} %{msdata=eabi: -memb}} \
 157 %{!mlittle: %{!mlittle-endian: %{!mbig: %{!mbig-endian: \
 158     %{mcall-freebsd: -mbig} \
 159     %{mcall-i960-old: -mlittle} \
 160     %{mcall-linux: -mbig} \
 161     %{mcall-gnu: -mbig} \
 162     %{mcall-netbsd: -mbig} \
 163 }}}}"
 164
 165 #define ASM_SPEC64 "-a64"
 166
 167 #define ASM_SPEC_COMMON "%(asm_cpu) \
 168 %{.s: %{mregnames} %{mno-regnames}} %{.S: %{mregnames} %{mno-regnames}} \
 169 %{v:-V} %{Qy:} %{!Qn:-Qy} %{Wa,*:%*} \
 170 %{mlittle} %{mlittle-endian} %{mbig} %{mbig-endian}"
 171
 172 #undef  SUBSUBTARGET_EXTRA_SPECS
 173 #define SUBSUBTARGET_EXTRA_SPECS \
 174   { "asm_spec_common",          ASM_SPEC_COMMON },                      \
 175   { "asm_spec32",               ASM_SPEC32 },                           \
 176   { "asm_spec64",               ASM_SPEC64 },                           \
 177   { "link_os_linux_spec32",     LINK_OS_LINUX_SPEC32 },                 \
 178   { "link_os_linux_spec64",     LINK_OS_LINUX_SPEC64 },
 179
 180 #undef  MULTILIB_DEFAULTS
 181 #if DEFAULT_ARCH64_P
 182 #define MULTILIB_DEFAULTS { "m64" }
 183 #else
 184 #define MULTILIB_DEFAULTS { "m32" }
 185 #endif
 186
 187 #ifndef RS6000_BI_ARCH
 188
 189 /* 64-bit PowerPC Linux is always big-endian.  */
 190 #undef  TARGET_LITTLE_ENDIAN
 191 #define TARGET_LITTLE_ENDIAN    0
 192
 193 /* 64-bit PowerPC Linux always has a TOC.  */
 194 #undef  TARGET_TOC
 195 #define TARGET_TOC              1
 196
 197 /* Some things from sysv4.h we don't do when 64 bit.  */
 198 #undef  TARGET_RELOCATABLE
 199 #define TARGET_RELOCATABLE      0
 200 #undef  TARGET_EABI
 201 #define TARGET_EABI             0
 202 #undef  TARGET_PROTOTYPE
 203 #define TARGET_PROTOTYPE        0
 204 #undef RELOCATABLE_NEEDS_FIXUP
 205 #define RELOCATABLE_NEEDS_FIXUP 0
 206
 207 #endif
 208
 209 /* We use glibc _mcount for profiling.  */
 210 #define NO_PROFILE_COUNTERS 1
 211 #define PROFILE_HOOK(LABEL) \
 212   do { if (TARGET_64BIT) output_profile_hook (LABEL); } while (0)
 213
 214 /* PowerPC64 Linux word-aligns FP doubles when -malign-power is given.  */
 215 #undef  ADJUST_FIELD_ALIGN
 216 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
 217   ((TARGET_ALTIVEC && TREE_CODE (TREE_TYPE (FIELD)) == VECTOR_TYPE)     \
 218    ? 128                                                                \
 219    : (TARGET_64BIT                                                      \
 220       && TARGET_ALIGN_NATURAL == 0                                      \
 221       && TYPE_MODE (TREE_CODE (TREE_TYPE (FIELD)) == ARRAY_TYPE         \
 222                     ? get_inner_array_type (FIELD)                      \
 223                     : TREE_TYPE (FIELD)) == DFmode)                     \
 224    ? MIN ((COMPUTED), 32)                                               \
 225    : (COMPUTED))
 226
 227 /* PowerPC64 Linux increases natural record alignment to doubleword if
 228    the first field is an FP double, only if in power alignment mode.  */
 229 #undef  ROUND_TYPE_ALIGN
 230 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                   \
 231   ((TARGET_64BIT                                                        \
 232     && (TREE_CODE (STRUCT) == RECORD_TYPE                               \
 233         || TREE_CODE (STRUCT) == UNION_TYPE                             \
 234         || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                       \
 235     && TARGET_ALIGN_NATURAL == 0)                                       \
 236    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)      \
 237    : MAX ((COMPUTED), (SPECIFIED)))
 238
 239 /* Use the default for compiling target libs.  */
 240 #ifdef IN_TARGET_LIBS
 241 #undef TARGET_ALIGN_NATURAL
 242 #define TARGET_ALIGN_NATURAL 1
 243 #endif
 244
 245 /* Indicate that jump tables go in the text section.  */
 246 #undef  JUMP_TABLES_IN_TEXT_SECTION
 247 #define JUMP_TABLES_IN_TEXT_SECTION TARGET_64BIT
 248
 249 /* The linux ppc64 ABI isn't explicit on whether aggregates smaller
 250    than a doubleword should be padded upward or downward.  You could
 251    reasonably assume that they follow the normal rules for structure
 252    layout treating the parameter area as any other block of memory,
 253    then map the reg param area to registers.  i.e. pad upward.
 254    Setting both of the following defines results in this behavior.
 255    Setting just the first one will result in aggregates that fit in a
 256    doubleword being padded downward, and others being padded upward.
 257    Not a bad idea as this results in struct { int x; } being passed
 258    the same way as an int.  */
 259 #define AGGREGATE_PADDING_FIXED TARGET_64BIT
 260 #define AGGREGATES_PAD_UPWARD_ALWAYS 0
 261
 262 /* Specify padding for the last element of a block move between
 263    registers and memory.  FIRST is nonzero if this is the only
 264    element.  */
 265 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 266   (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
 267
 268 /* __throw will restore its own return address to be the same as the
 269    return address of the function that the throw is being made to.
 270    This is unfortunate, because we want to check the original
 271    return address to see if we need to restore the TOC.
 272    So we have to squirrel it away with this.  */
 273 #define SETUP_FRAME_ADDRESSES() \
 274   do { if (TARGET_64BIT) rs6000_aix_emit_builtin_unwind_init (); } while (0)
 275
 276 /* Override svr4.h  */
 277 #undef MD_EXEC_PREFIX
 278 #undef MD_STARTFILE_PREFIX
 279
 280 /* Linux doesn't support saving and restoring 64-bit regs in a 32-bit
 281    process.  */
 282 #define OS_MISSING_POWERPC64 !TARGET_64BIT
 283
 284 /* glibc has float and long double forms of math functions.  */
 285 #undef  TARGET_C99_FUNCTIONS
 286 #define TARGET_C99_FUNCTIONS (OPTION_GLIBC)
 287
 288 #undef  TARGET_OS_CPP_BUILTINS
 289 #define TARGET_OS_CPP_BUILTINS()                        \
 290   do                                                    \
 291     {                                                   \
 292       if (TARGET_64BIT)                                 \
 293         {                                               \
 294           builtin_define ("__PPC__");                   \
 295           builtin_define ("__PPC64__");                 \
 296           builtin_define ("__powerpc__");               \
 297           builtin_define ("__powerpc64__");             \
 298           builtin_assert ("cpu=powerpc64");             \
 299           builtin_assert ("machine=powerpc64");         \
 300         }                                               \
 301       else                                              \
 302         {                                               \
 303           builtin_define_std ("PPC");                   \
 304           builtin_define_std ("powerpc");               \
 305           builtin_assert ("cpu=powerpc");               \
 306           builtin_assert ("machine=powerpc");           \
 307           TARGET_OS_SYSV_CPP_BUILTINS ();               \
 308         }                                               \
 309     }                                                   \
 310   while (0)
 311
 312 #undef  CPP_OS_DEFAULT_SPEC
 313 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux)"
 314
 315 /* The GNU C++ standard library currently requires _GNU_SOURCE being
 316    defined on glibc-based systems. This temporary hack accomplishes this,
 317    it should go away as soon as libstdc++-v3 has a real fix.  */
 318 #undef  CPLUSPLUS_CPP_SPEC
 319 #define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
 320
 321 #undef  LINK_SHLIB_SPEC
 322 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
 323
 324 #undef  LIB_DEFAULT_SPEC
 325 #define LIB_DEFAULT_SPEC "%(lib_linux)"
 326
 327 #undef  STARTFILE_DEFAULT_SPEC
 328 #define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
 329
 330 #undef  ENDFILE_DEFAULT_SPEC
 331 #define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
 332
 333 #undef  LINK_START_DEFAULT_SPEC
 334 #define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
 335
 336 #undef  LINK_OS_DEFAULT_SPEC
 337 #define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
 338
 339 #define GLIBC_DYNAMIC_LINKER32 "/lib/ld.so.1"
 340 #define GLIBC_DYNAMIC_LINKER64 "/lib64/ld64.so.1"
 341 #define UCLIBC_DYNAMIC_LINKER32 "/lib/ld-uClibc.so.0"
 342 #define UCLIBC_DYNAMIC_LINKER64 "/lib/ld64-uClibc.so.0"
 343 #if UCLIBC_DEFAULT
 344 #define CHOOSE_DYNAMIC_LINKER(G, U) "%{mglibc:%{muclibc:%e-mglibc and -muclibc used together}" G ";:" U "}"
 345 #else
 346 #define CHOOSE_DYNAMIC_LINKER(G, U) "%{muclibc:%{mglibc:%e-mglibc and -muclibc used together}" U ";:" G "}"
 347 #endif
 348 #define LINUX_DYNAMIC_LINKER32 \
 349   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32)
 350 #define LINUX_DYNAMIC_LINKER64 \
 351   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64)
 352
 353
 354 #define LINK_OS_LINUX_SPEC32 "-m elf32ppclinux %{!shared: %{!static: \
 355   %{rdynamic:-export-dynamic} \
 356   %{!dynamic-linker:-dynamic-linker " LINUX_DYNAMIC_LINKER32 "}}}"
 357
 358 #define LINK_OS_LINUX_SPEC64 "-m elf64ppc %{!shared: %{!static: \
 359   %{rdynamic:-export-dynamic} \
 360   %{!dynamic-linker:-dynamic-linker " LINUX_DYNAMIC_LINKER64 "}}}"
 361
 362 #undef  TOC_SECTION_ASM_OP
 363 #define TOC_SECTION_ASM_OP \
 364   (TARGET_64BIT                                         \
 365    ? "\t.section\t\".toc\",\"aw\""                      \
 366    : "\t.section\t\".got\",\"aw\"")
 367
 368 #undef  MINIMAL_TOC_SECTION_ASM_OP
 369 #define MINIMAL_TOC_SECTION_ASM_OP \
 370   (TARGET_64BIT                                         \
 371    ? "\t.section\t\".toc1\",\"aw\""                     \
 372    : ((TARGET_RELOCATABLE || flag_pic)                  \
 373       ? "\t.section\t\".got2\",\"aw\""                  \
 374       : "\t.section\t\".got1\",\"aw\""))
 375
 376 #undef  TARGET_VERSION
 377 #define TARGET_VERSION fprintf (stderr, " (PowerPC64 GNU/Linux)");
 378
 379 /* Must be at least as big as our pointer type.  */
 380 #undef  SIZE_TYPE
 381 #define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int")
 382
 383 #undef  PTRDIFF_TYPE
 384 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
 385
 386 #undef  WCHAR_TYPE
 387 #define WCHAR_TYPE (TARGET_64BIT ? "int" : "long int")
 388 #undef  WCHAR_TYPE_SIZE
 389 #define WCHAR_TYPE_SIZE 32
 390
 391 /* Override rs6000.h definition.  */
 392 #undef  ASM_APP_ON
 393 #define ASM_APP_ON "#APP\n"
 394
 395 /* Override rs6000.h definition.  */
 396 #undef  ASM_APP_OFF
 397 #define ASM_APP_OFF "#NO_APP\n"
 398
 399 /* PowerPC no-op instruction.  */
 400 #undef  RS6000_CALL_GLUE
 401 #define RS6000_CALL_GLUE (TARGET_64BIT ? "nop" : "cror 31,31,31")
 402
 403 #undef  RS6000_MCOUNT
 404 #define RS6000_MCOUNT "_mcount"
 405
 406 #ifdef __powerpc64__
 407 /* _init and _fini functions are built from bits spread across many
 408    object files, each potentially with a different TOC pointer.  For
 409    that reason, place a nop after the call so that the linker can
 410    restore the TOC pointer if a TOC adjusting call stub is needed.  */
 411 #if DOT_SYMBOLS
 412 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 413   asm (SECTION_OP "\n"                                  \
 414 "       bl ." #FUNC "\n"                                \
 415 "       nop\n"                                          \
 416 "       .previous");
 417 #else
 418 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 419   asm (SECTION_OP "\n"                                  \
 420 "       bl " #FUNC "\n"                                 \
 421 "       nop\n"                                          \
 422 "       .previous");
 423 #endif
 424 #endif
 425
 426 /* FP save and restore routines.  */
 427 #undef  SAVE_FP_PREFIX
 428 #define SAVE_FP_PREFIX (TARGET_64BIT ? "._savef" : "_savefpr_")
 429 #undef  SAVE_FP_SUFFIX
 430 #define SAVE_FP_SUFFIX (TARGET_64BIT ? "" : "_l")
 431 #undef  RESTORE_FP_PREFIX
 432 #define RESTORE_FP_PREFIX (TARGET_64BIT ? "._restf" : "_restfpr_")
 433 #undef  RESTORE_FP_SUFFIX
 434 #define RESTORE_FP_SUFFIX (TARGET_64BIT ? "" : "_l")
 435
 436 /* Dwarf2 debugging.  */
 437 #undef  PREFERRED_DEBUGGING_TYPE
 438 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 439
 440 /* This is how to declare the size of a function.  */
 441 #undef  ASM_DECLARE_FUNCTION_SIZE
 442 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 443   do                                                                    \
 444     {                                                                   \
 445       if (!flag_inhibit_size_directive)                                 \
 446         {                                                               \
 447           fputs ("\t.size\t", (FILE));                                  \
 448           if (TARGET_64BIT && DOT_SYMBOLS)                              \
 449             putc ('.', (FILE));                                         \
 450           assemble_name ((FILE), (FNAME));                              \
 451           fputs (",.-", (FILE));                                        \
 452           rs6000_output_function_entry (FILE, FNAME);                   \
 453           putc ('\n', (FILE));                                          \
 454         }                                                               \
 455     }                                                                   \
 456   while (0)
 457
 458 /* Return nonzero if this entry is to be written into the constant
 459    pool in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF
 460    or a CONST containing one of them.  If -mfp-in-toc (the default),
 461    we also do this for floating-point constants.  We actually can only
 462    do this if the FP formats of the target and host machines are the
 463    same, but we can't check that since not every file that uses
 464    GO_IF_LEGITIMATE_ADDRESS_P includes real.h.  We also do this when
 465    we can write the entry into the TOC and the entry is not larger
 466    than a TOC entry.  */
 467
 468 #undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
 469 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
 470   (TARGET_TOC                                                           \
 471    && (GET_CODE (X) == SYMBOL_REF                                       \
 472        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
 473            && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)           \
 474        || GET_CODE (X) == LABEL_REF                                     \
 475        || (GET_CODE (X) == CONST_INT                                    \
 476            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
 477        || (GET_CODE (X) == CONST_DOUBLE                                 \
 478            && ((TARGET_64BIT                                            \
 479                 && (TARGET_POWERPC64                                    \
 480                     || TARGET_MINIMAL_TOC                               \
 481                     || (SCALAR_FLOAT_MODE_P (GET_MODE (X))              \
 482                         && ! TARGET_NO_FP_IN_TOC)))                     \
 483                || (!TARGET_64BIT                                        \
 484                    && !TARGET_NO_FP_IN_TOC                              \
 485                    && !TARGET_RELOCATABLE                               \
 486                    && SCALAR_FLOAT_MODE_P (GET_MODE (X))                \
 487                    && BITS_PER_WORD == HOST_BITS_PER_INT)))))
 488
 489 /* Select a format to encode pointers in exception handling data.  CODE
 490    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
 491    true if the symbol may be affected by dynamic relocations.  */
 492 #undef  ASM_PREFERRED_EH_DATA_FORMAT
 493 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 494   ((TARGET_64BIT || flag_pic || TARGET_RELOCATABLE)                     \
 495    ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel               \
 496       | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4))             \
 497    : DW_EH_PE_absptr)
 498
 499 /* For backward compatibility, we must continue to use the AIX
 500    structure return convention.  */
 501 #undef DRAFT_V4_STRUCT_RET
 502 #define DRAFT_V4_STRUCT_RET (!TARGET_64BIT)
 503
 504 #define TARGET_ASM_FILE_END rs6000_elf_end_indicate_exec_stack
 505
 506 #define TARGET_POSIX_IO
 507
 508 #define LINK_GCC_C_SEQUENCE_SPEC \
 509   "%{static:--start-group} %G %L %{static:--end-group}%{!static:%G}"
 510
 511 /* Use --as-needed -lgcc_s for eh support.  */
 512 #ifdef HAVE_LD_AS_NEEDED
 513 #define USE_LD_AS_NEEDED 1
 514 #endif
 515
 516 #define MD_UNWIND_SUPPORT "config/rs6000/linux-unwind.h"
 517
 518 #ifdef TARGET_LIBC_PROVIDES_SSP
 519 /* ppc32 glibc provides __stack_chk_guard in -0x7008(2),
 520    ppc64 glibc provides it at -0x7010(13).  */
 521 #define TARGET_THREAD_SSP_OFFSET        (TARGET_64BIT ? -0x7010 : -0x7008)
 522 #endif
 523
 524 #define POWERPC_LINUX
 525
 526 /* ppc{32,64} linux has 128-bit long double support in glibc 2.4 and later.  */
 527 #ifdef TARGET_DEFAULT_LONG_DOUBLE_128
 528 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
 529 #endif