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   (target_flags & target_flags_explicit & 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 (!rs6000_explicit_options.alignment)                   \
  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 (target_flags & MASK_RELOCATABLE)                  \
 107             {                                                   \
 108               target_flags &= ~MASK_RELOCATABLE;                \
 109               error (INVALID_64BIT, "relocatable");             \
 110             }                                                   \
 111           if (target_flags & MASK_EABI)                         \
 112             {                                                   \
 113               target_flags &= ~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 ((target_flags & MASK_POWERPC64) == 0)             \
 122             {                                                   \
 123               target_flags |= MASK_POWERPC64;                   \
 124               error ("-m64 requires a PowerPC64 cpu");          \
 125             }                                                   \
 126           if ((target_flags_explicit & MASK_MINIMAL_TOC) != 0)  \
 127             {                                                   \
 128               if (rs6000_explicit_options.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 (!rs6000_explicit_options.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 (rs6000_explicit_options.cmodel)                   \
 154             {                                                   \
 155               SET_CMODEL (CMODEL_SMALL);                        \
 156               error (INVALID_32BIT, "cmodel");                  \
 157             }                                                   \
 158         }                                                       \
 159     }                                                           \
 160   while (0)
 161
 162 #ifdef  RS6000_BI_ARCH
 163
 164 #undef  OPTION_TARGET_CPU_DEFAULT
 165 #define OPTION_TARGET_CPU_DEFAULT \
 166   (((TARGET_DEFAULT ^ target_flags) & MASK_64BIT) \
 167    ? (char *) 0 : TARGET_CPU_DEFAULT)
 168
 169 #endif
 170
 171 #undef  ASM_DEFAULT_SPEC
 172 #undef  ASM_SPEC
 173 #undef  LINK_OS_LINUX_SPEC
 174
 175 /* FIXME: This will quite possibly choose the wrong dynamic linker.  */
 176 #undef  LINK_OS_GNU_SPEC
 177 #define LINK_OS_GNU_SPEC LINK_OS_LINUX_SPEC
 178
 179 #ifndef RS6000_BI_ARCH
 180 #define ASM_DEFAULT_SPEC "-mppc64"
 181 #define ASM_SPEC         "%(asm_spec64) %(asm_spec_common)"
 182 #define LINK_OS_LINUX_SPEC "%(link_os_linux_spec64)"
 183 #else
 184 #if DEFAULT_ARCH64_P
 185 #define ASM_DEFAULT_SPEC "-mppc%{!m32:64}"
 186 #define ASM_SPEC         "%{m32:%(asm_spec32)}%{!m32:%(asm_spec64)} %(asm_spec_common)"
 187 #define LINK_OS_LINUX_SPEC "%{m32:%(link_os_linux_spec32)}%{!m32:%(link_os_linux_spec64)}"
 188 #else
 189 #define ASM_DEFAULT_SPEC "-mppc%{m64:64}"
 190 #define ASM_SPEC         "%{!m64:%(asm_spec32)}%{m64:%(asm_spec64)} %(asm_spec_common)"
 191 #define LINK_OS_LINUX_SPEC "%{!m64:%(link_os_linux_spec32)}%{m64:%(link_os_linux_spec64)}"
 192 #endif
 193 #endif
 194
 195 #define ASM_SPEC32 "-a32 \
 196 %{mrelocatable} %{mrelocatable-lib} %{fpic:-K PIC} %{fPIC:-K PIC} \
 197 %{memb} %{!memb: %{msdata=eabi: -memb}} \
 198 %{!mlittle: %{!mlittle-endian: %{!mbig: %{!mbig-endian: \
 199     %{mcall-freebsd: -mbig} \
 200     %{mcall-i960-old: -mlittle} \
 201     %{mcall-linux: -mbig} \
 202     %{mcall-gnu: -mbig} \
 203     %{mcall-netbsd: -mbig} \
 204 }}}}"
 205
 206 #define ASM_SPEC64 "-a64"
 207
 208 #define ASM_SPEC_COMMON "%(asm_cpu) \
 209 %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}} \
 210 %{mlittle} %{mlittle-endian} %{mbig} %{mbig-endian}"
 211
 212 #undef  SUBSUBTARGET_EXTRA_SPECS
 213 #define SUBSUBTARGET_EXTRA_SPECS \
 214   { "asm_spec_common",          ASM_SPEC_COMMON },                      \
 215   { "asm_spec32",               ASM_SPEC32 },                           \
 216   { "asm_spec64",               ASM_SPEC64 },                           \
 217   { "link_os_linux_spec32",     LINK_OS_LINUX_SPEC32 },                 \
 218   { "link_os_linux_spec64",     LINK_OS_LINUX_SPEC64 },
 219
 220 #undef  MULTILIB_DEFAULTS
 221 #if DEFAULT_ARCH64_P
 222 #define MULTILIB_DEFAULTS { "m64" }
 223 #else
 224 #define MULTILIB_DEFAULTS { "m32" }
 225 #endif
 226
 227 #ifndef RS6000_BI_ARCH
 228
 229 /* 64-bit PowerPC Linux is always big-endian.  */
 230 #undef  TARGET_LITTLE_ENDIAN
 231 #define TARGET_LITTLE_ENDIAN    0
 232
 233 /* 64-bit PowerPC Linux always has a TOC.  */
 234 #undef  TARGET_TOC
 235 #define TARGET_TOC              1
 236
 237 /* Some things from sysv4.h we don't do when 64 bit.  */
 238 #undef  TARGET_RELOCATABLE
 239 #define TARGET_RELOCATABLE      0
 240 #undef  TARGET_EABI
 241 #define TARGET_EABI             0
 242 #undef  TARGET_PROTOTYPE
 243 #define TARGET_PROTOTYPE        0
 244 #undef RELOCATABLE_NEEDS_FIXUP
 245 #define RELOCATABLE_NEEDS_FIXUP 0
 246
 247 #endif
 248
 249 /* We use glibc _mcount for profiling.  */
 250 #define NO_PROFILE_COUNTERS 1
 251 #define PROFILE_HOOK(LABEL) \
 252   do { if (TARGET_64BIT) output_profile_hook (LABEL); } while (0)
 253
 254 /* PowerPC64 Linux word-aligns FP doubles when -malign-power is given.  */
 255 #undef  ADJUST_FIELD_ALIGN
 256 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
 257   ((TARGET_ALTIVEC && TREE_CODE (TREE_TYPE (FIELD)) == VECTOR_TYPE)     \
 258    ? 128                                                                \
 259    : (TARGET_64BIT                                                      \
 260       && TARGET_ALIGN_NATURAL == 0                                      \
 261       && TYPE_MODE (strip_array_types (TREE_TYPE (FIELD))) == DFmode)   \
 262    ? MIN ((COMPUTED), 32)                                               \
 263    : (COMPUTED))
 264
 265 /* PowerPC64 Linux increases natural record alignment to doubleword if
 266    the first field is an FP double, only if in power alignment mode.  */
 267 #undef  ROUND_TYPE_ALIGN
 268 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                   \
 269   ((TARGET_64BIT                                                        \
 270     && (TREE_CODE (STRUCT) == RECORD_TYPE                               \
 271         || TREE_CODE (STRUCT) == UNION_TYPE                             \
 272         || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                       \
 273     && TARGET_ALIGN_NATURAL == 0)                                       \
 274    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)      \
 275    : MAX ((COMPUTED), (SPECIFIED)))
 276
 277 /* Use the default for compiling target libs.  */
 278 #ifdef IN_TARGET_LIBS
 279 #undef TARGET_ALIGN_NATURAL
 280 #define TARGET_ALIGN_NATURAL 1
 281 #endif
 282
 283 /* Indicate that jump tables go in the text section.  */
 284 #undef  JUMP_TABLES_IN_TEXT_SECTION
 285 #define JUMP_TABLES_IN_TEXT_SECTION TARGET_64BIT
 286
 287 /* The linux ppc64 ABI isn't explicit on whether aggregates smaller
 288    than a doubleword should be padded upward or downward.  You could
 289    reasonably assume that they follow the normal rules for structure
 290    layout treating the parameter area as any other block of memory,
 291    then map the reg param area to registers.  i.e. pad upward.
 292    Setting both of the following defines results in this behavior.
 293    Setting just the first one will result in aggregates that fit in a
 294    doubleword being padded downward, and others being padded upward.
 295    Not a bad idea as this results in struct { int x; } being passed
 296    the same way as an int.  */
 297 #define AGGREGATE_PADDING_FIXED TARGET_64BIT
 298 #define AGGREGATES_PAD_UPWARD_ALWAYS 0
 299
 300 /* Specify padding for the last element of a block move between
 301    registers and memory.  FIRST is nonzero if this is the only
 302    element.  */
 303 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 304   (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
 305
 306 /* Linux doesn't support saving and restoring 64-bit regs in a 32-bit
 307    process.  */
 308 #define OS_MISSING_POWERPC64 !TARGET_64BIT
 309
 310 #ifdef SINGLE_LIBC
 311 #define OPTION_GLIBC  (DEFAULT_LIBC == LIBC_GLIBC)
 312 #else
 313 #define OPTION_GLIBC  (linux_libc == LIBC_GLIBC)
 314 #endif
 315
 316 /* glibc has float and long double forms of math functions.  */
 317 #undef  TARGET_C99_FUNCTIONS
 318 #define TARGET_C99_FUNCTIONS (OPTION_GLIBC)
 319
 320 /* Whether we have sincos that follows the GNU extension.  */
 321 #undef  TARGET_HAS_SINCOS
 322 #define TARGET_HAS_SINCOS (OPTION_GLIBC)
 323
 324 #undef  TARGET_OS_CPP_BUILTINS
 325 #define TARGET_OS_CPP_BUILTINS()                        \
 326   do                                                    \
 327     {                                                   \
 328       if (TARGET_64BIT)                                 \
 329         {                                               \
 330           builtin_define ("__PPC__");                   \
 331           builtin_define ("__PPC64__");                 \
 332           builtin_define ("__powerpc__");               \
 333           builtin_define ("__powerpc64__");             \
 334           builtin_assert ("cpu=powerpc64");             \
 335           builtin_assert ("machine=powerpc64");         \
 336         }                                               \
 337       else                                              \
 338         {                                               \
 339           builtin_define_std ("PPC");                   \
 340           builtin_define_std ("powerpc");               \
 341           builtin_assert ("cpu=powerpc");               \
 342           builtin_assert ("machine=powerpc");           \
 343           TARGET_OS_SYSV_CPP_BUILTINS ();               \
 344         }                                               \
 345     }                                                   \
 346   while (0)
 347
 348 #undef  CPP_OS_DEFAULT_SPEC
 349 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux)"
 350
 351 /* The GNU C++ standard library currently requires _GNU_SOURCE being
 352    defined on glibc-based systems. This temporary hack accomplishes this,
 353    it should go away as soon as libstdc++-v3 has a real fix.  */
 354 #undef  CPLUSPLUS_CPP_SPEC
 355 #define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
 356
 357 #undef  LINK_SHLIB_SPEC
 358 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
 359
 360 #undef  LIB_DEFAULT_SPEC
 361 #define LIB_DEFAULT_SPEC "%(lib_linux)"
 362
 363 #undef  STARTFILE_DEFAULT_SPEC
 364 #define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
 365
 366 #undef  ENDFILE_DEFAULT_SPEC
 367 #define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
 368
 369 #undef  LINK_START_DEFAULT_SPEC
 370 #define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
 371
 372 #undef  LINK_OS_DEFAULT_SPEC
 373 #define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
 374
 375 #define GLIBC_DYNAMIC_LINKER32 "/lib/ld.so.1"
 376 #define GLIBC_DYNAMIC_LINKER64 "/lib64/ld64.so.1"
 377 #define UCLIBC_DYNAMIC_LINKER32 "/lib/ld-uClibc.so.0"
 378 #define UCLIBC_DYNAMIC_LINKER64 "/lib/ld64-uClibc.so.0"
 379 #if DEFAULT_LIBC == LIBC_UCLIBC
 380 #define CHOOSE_DYNAMIC_LINKER(G, U) "%{mglibc:" G ";:" U "}"
 381 #elif DEFAULT_LIBC == LIBC_GLIBC
 382 #define CHOOSE_DYNAMIC_LINKER(G, U) "%{muclibc:" U ";:" G "}"
 383 #else
 384 #error "Unsupported DEFAULT_LIBC"
 385 #endif
 386 #define LINUX_DYNAMIC_LINKER32 \
 387   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32)
 388 #define LINUX_DYNAMIC_LINKER64 \
 389   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64)
 390
 391
 392 #define LINK_OS_LINUX_SPEC32 "-m elf32ppclinux %{!shared: %{!static: \
 393   %{rdynamic:-export-dynamic} \
 394   -dynamic-linker " LINUX_DYNAMIC_LINKER32 "}}"
 395
 396 #define LINK_OS_LINUX_SPEC64 "-m elf64ppc %{!shared: %{!static: \
 397   %{rdynamic:-export-dynamic} \
 398   -dynamic-linker " LINUX_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 #undef  TARGET_VERSION
 415 #define TARGET_VERSION fprintf (stderr, " (PowerPC64 GNU/Linux)");
 416
 417 /* Must be at least as big as our pointer type.  */
 418 #undef  SIZE_TYPE
 419 #define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int")
 420
 421 #undef  PTRDIFF_TYPE
 422 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
 423
 424 #undef  WCHAR_TYPE
 425 #define WCHAR_TYPE (TARGET_64BIT ? "int" : "long int")
 426 #undef  WCHAR_TYPE_SIZE
 427 #define WCHAR_TYPE_SIZE 32
 428
 429 /* Override rs6000.h definition.  */
 430 #undef  ASM_APP_ON
 431 #define ASM_APP_ON "#APP\n"
 432
 433 /* Override rs6000.h definition.  */
 434 #undef  ASM_APP_OFF
 435 #define ASM_APP_OFF "#NO_APP\n"
 436
 437 /* PowerPC no-op instruction.  */
 438 #undef  RS6000_CALL_GLUE
 439 #define RS6000_CALL_GLUE (TARGET_64BIT ? "nop" : "cror 31,31,31")
 440
 441 #undef  RS6000_MCOUNT
 442 #define RS6000_MCOUNT "_mcount"
 443
 444 #ifdef __powerpc64__
 445 /* _init and _fini functions are built from bits spread across many
 446    object files, each potentially with a different TOC pointer.  For
 447    that reason, place a nop after the call so that the linker can
 448    restore the TOC pointer if a TOC adjusting call stub is needed.  */
 449 #if DOT_SYMBOLS
 450 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 451   asm (SECTION_OP "\n"                                  \
 452 "       bl ." #FUNC "\n"                                \
 453 "       nop\n"                                          \
 454 "       .previous");
 455 #else
 456 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 457   asm (SECTION_OP "\n"                                  \
 458 "       bl " #FUNC "\n"                                 \
 459 "       nop\n"                                          \
 460 "       .previous");
 461 #endif
 462 #endif
 463
 464 /* FP save and restore routines.  */
 465 #undef  SAVE_FP_PREFIX
 466 #define SAVE_FP_PREFIX (TARGET_64BIT ? "._savef" : "_savefpr_")
 467 #undef  SAVE_FP_SUFFIX
 468 #define SAVE_FP_SUFFIX ""
 469 #undef  RESTORE_FP_PREFIX
 470 #define RESTORE_FP_PREFIX (TARGET_64BIT ? "._restf" : "_restfpr_")
 471 #undef  RESTORE_FP_SUFFIX
 472 #define RESTORE_FP_SUFFIX ""
 473
 474 /* Dwarf2 debugging.  */
 475 #undef  PREFERRED_DEBUGGING_TYPE
 476 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 477
 478 /* This is how to declare the size of a function.  */
 479 #undef  ASM_DECLARE_FUNCTION_SIZE
 480 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 481   do                                                                    \
 482     {                                                                   \
 483       if (!flag_inhibit_size_directive)                                 \
 484         {                                                               \
 485           fputs ("\t.size\t", (FILE));                                  \
 486           if (TARGET_64BIT && DOT_SYMBOLS)                              \
 487             putc ('.', (FILE));                                         \
 488           assemble_name ((FILE), (FNAME));                              \
 489           fputs (",.-", (FILE));                                        \
 490           rs6000_output_function_entry (FILE, FNAME);                   \
 491           putc ('\n', (FILE));                                          \
 492         }                                                               \
 493     }                                                                   \
 494   while (0)
 495
 496 /* Return nonzero if this entry is to be written into the constant
 497    pool in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF
 498    or a CONST containing one of them.  If -mfp-in-toc (the default),
 499    we also do this for floating-point constants.  We actually can only
 500    do this if the FP formats of the target and host machines are the
 501    same, but we can't check that since not every file that uses
 502    the macros includes real.h.  We also do this when we can write the
 503    entry into the TOC and the entry is not larger than a TOC entry.  */
 504
 505 #undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
 506 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
 507   (TARGET_TOC                                                           \
 508    && (GET_CODE (X) == SYMBOL_REF                                       \
 509        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
 510            && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)           \
 511        || GET_CODE (X) == LABEL_REF                                     \
 512        || (GET_CODE (X) == CONST_INT                                    \
 513            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
 514        || (GET_CODE (X) == CONST_DOUBLE                                 \
 515            && ((TARGET_64BIT                                            \
 516                 && (TARGET_MINIMAL_TOC                                  \
 517                     || (SCALAR_FLOAT_MODE_P (GET_MODE (X))              \
 518                         && ! TARGET_NO_FP_IN_TOC)))                     \
 519                || (!TARGET_64BIT                                        \
 520                    && !TARGET_NO_FP_IN_TOC                              \
 521                    && !TARGET_RELOCATABLE                               \
 522                    && SCALAR_FLOAT_MODE_P (GET_MODE (X))                \
 523                    && BITS_PER_WORD == HOST_BITS_PER_INT)))))
 524
 525 /* Select a format to encode pointers in exception handling data.  CODE
 526    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
 527    true if the symbol may be affected by dynamic relocations.  */
 528 #undef  ASM_PREFERRED_EH_DATA_FORMAT
 529 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 530   ((TARGET_64BIT || flag_pic || TARGET_RELOCATABLE)                     \
 531    ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel               \
 532       | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4))             \
 533    : DW_EH_PE_absptr)
 534
 535 /* For backward compatibility, we must continue to use the AIX
 536    structure return convention.  */
 537 #undef DRAFT_V4_STRUCT_RET
 538 #define DRAFT_V4_STRUCT_RET (!TARGET_64BIT)
 539
 540 #define TARGET_POSIX_IO
 541
 542 #define LINK_GCC_C_SEQUENCE_SPEC \
 543   "%{static:--start-group} %G %L %{static:--end-group}%{!static:%G}"
 544
 545 /* Use --as-needed -lgcc_s for eh support.  */
 546 #ifdef HAVE_LD_AS_NEEDED
 547 #define USE_LD_AS_NEEDED 1
 548 #endif
 549
 550 #define MD_UNWIND_SUPPORT "config/rs6000/linux-unwind.h"
 551
 552 #ifdef TARGET_LIBC_PROVIDES_SSP
 553 /* ppc32 glibc provides __stack_chk_guard in -0x7008(2),
 554    ppc64 glibc provides it at -0x7010(13).  */
 555 #define TARGET_THREAD_SSP_OFFSET        (TARGET_64BIT ? -0x7010 : -0x7008)
 556 #endif
 557
 558 #define POWERPC_LINUX
 559
 560 /* ppc{32,64} linux has 128-bit long double support in glibc 2.4 and later.  */
 561 #ifdef TARGET_DEFAULT_LONG_DOUBLE_128
 562 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
 563 #endif
 564
 565 /* Static stack checking is supported by means of probes.  */
 566 #define STACK_CHECK_STATIC_BUILTIN 1
 567
 568 /* The default value isn't sufficient in 64-bit mode.  */
 569 #define STACK_CHECK_PROTECT (TARGET_64BIT ? 16 * 1024 : 12 * 1024)