gcc/config/rs6000/linux64.h

   1 /* Definitions of target machine for GNU compiler,
   2    for 64 bit PowerPC linux.
   3    Copyright (C) 2000-2015 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  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 #define TARGET_PROFILE_KERNEL profile_kernel
  61
  62 #define TARGET_USES_LINUX64_OPT 1
  63 #ifdef HAVE_LD_LARGE_TOC
  64 #undef TARGET_CMODEL
  65 #define TARGET_CMODEL rs6000_current_cmodel
  66 #define SET_CMODEL(opt) rs6000_current_cmodel = opt
  67 #else
  68 #define SET_CMODEL(opt) do {} while (0)
  69 #endif
  70
  71 #undef  PROCESSOR_DEFAULT
  72 #define PROCESSOR_DEFAULT PROCESSOR_POWER7
  73 #undef  PROCESSOR_DEFAULT64
  74 #define PROCESSOR_DEFAULT64 PROCESSOR_POWER8
  75
  76 /* We don't need to generate entries in .fixup, except when
  77    -mrelocatable or -mrelocatable-lib is given.  */
  78 #undef RELOCATABLE_NEEDS_FIXUP
  79 #define RELOCATABLE_NEEDS_FIXUP \
  80   (rs6000_isa_flags & rs6000_isa_flags_explicit & OPTION_MASK_RELOCATABLE)
  81
  82 #undef  RS6000_ABI_NAME
  83 #define RS6000_ABI_NAME "linux"
  84
  85 #define INVALID_64BIT "-m%s not supported in this configuration"
  86 #define INVALID_32BIT INVALID_64BIT
  87
  88 #ifdef LINUX64_DEFAULT_ABI_ELFv2
  89 #define ELFv2_ABI_CHECK (rs6000_elf_abi != 1)
  90 #else
  91 #define ELFv2_ABI_CHECK (rs6000_elf_abi == 2)
  92 #endif
  93
  94 #undef  SUBSUBTARGET_OVERRIDE_OPTIONS
  95 #define SUBSUBTARGET_OVERRIDE_OPTIONS                           \
  96   do                                                            \
  97     {                                                           \
  98       if (!global_options_set.x_rs6000_alignment_flags)         \
  99         rs6000_alignment_flags = MASK_ALIGN_NATURAL;            \
 100       if (rs6000_isa_flags & OPTION_MASK_64BIT)                 \
 101         {                                                       \
 102           if (DEFAULT_ABI != ABI_AIX)                           \
 103             {                                                   \
 104               rs6000_current_abi = ABI_AIX;                     \
 105               error (INVALID_64BIT, "call");                    \
 106             }                                                   \
 107           dot_symbols = !strcmp (rs6000_abi_name, "aixdesc");   \
 108           if (ELFv2_ABI_CHECK)                                  \
 109             {                                                   \
 110               rs6000_current_abi = ABI_ELFv2;                   \
 111               if (dot_symbols)                                  \
 112                 error ("-mcall-aixdesc incompatible with -mabi=elfv2"); \
 113             }                                                   \
 114           if (rs6000_isa_flags & OPTION_MASK_RELOCATABLE)       \
 115             {                                                   \
 116               rs6000_isa_flags &= ~OPTION_MASK_RELOCATABLE;     \
 117               error (INVALID_64BIT, "relocatable");             \
 118             }                                                   \
 119           if (rs6000_isa_flags & OPTION_MASK_EABI)              \
 120             {                                                   \
 121               rs6000_isa_flags &= ~OPTION_MASK_EABI;            \
 122               error (INVALID_64BIT, "eabi");                    \
 123             }                                                   \
 124           if (TARGET_PROTOTYPE)                                 \
 125             {                                                   \
 126               target_prototype = 0;                             \
 127               error (INVALID_64BIT, "prototype");               \
 128             }                                                   \
 129           if ((rs6000_isa_flags & OPTION_MASK_POWERPC64) == 0)  \
 130             {                                                   \
 131               rs6000_isa_flags |= OPTION_MASK_POWERPC64;        \
 132               error ("-m64 requires a PowerPC64 cpu");          \
 133             }                                                   \
 134           if ((rs6000_isa_flags_explicit                        \
 135                & OPTION_MASK_MINIMAL_TOC) != 0)                 \
 136             {                                                   \
 137               if (global_options_set.x_rs6000_current_cmodel    \
 138                   && rs6000_current_cmodel != CMODEL_SMALL)     \
 139                 error ("-mcmodel incompatible with other toc options"); \
 140               SET_CMODEL (CMODEL_SMALL);                        \
 141             }                                                   \
 142           else                                                  \
 143             {                                                   \
 144               if (!global_options_set.x_rs6000_current_cmodel)  \
 145                 SET_CMODEL (CMODEL_MEDIUM);                     \
 146               if (rs6000_current_cmodel != CMODEL_SMALL)        \
 147                 {                                               \
 148                   if (!global_options_set.x_TARGET_NO_FP_IN_TOC) \
 149                     TARGET_NO_FP_IN_TOC                         \
 150                       = rs6000_current_cmodel == CMODEL_MEDIUM; \
 151                   if (!global_options_set.x_TARGET_NO_SUM_IN_TOC) \
 152                     TARGET_NO_SUM_IN_TOC = 0;                   \
 153                 }                                               \
 154             }                                                   \
 155         }                                                       \
 156       else                                                      \
 157         {                                                       \
 158           if (!RS6000_BI_ARCH_P)                                \
 159             error (INVALID_32BIT, "32");                        \
 160           if (TARGET_PROFILE_KERNEL)                            \
 161             {                                                   \
 162               TARGET_PROFILE_KERNEL = 0;                        \
 163               error (INVALID_32BIT, "profile-kernel");          \
 164             }                                                   \
 165           if (global_options_set.x_rs6000_current_cmodel)       \
 166             {                                                   \
 167               SET_CMODEL (CMODEL_SMALL);                        \
 168               error (INVALID_32BIT, "cmodel");                  \
 169             }                                                   \
 170         }                                                       \
 171     }                                                           \
 172   while (0)
 173
 174 #undef  ASM_DEFAULT_SPEC
 175 #undef  ASM_SPEC
 176 #undef  LINK_OS_LINUX_SPEC
 177
 178 #ifndef RS6000_BI_ARCH
 179 #define ASM_DEFAULT_SPEC "-mppc64"
 180 #define ASM_SPEC         "%(asm_spec64) %(asm_spec_common)"
 181 #define LINK_OS_LINUX_SPEC "%(link_os_linux_spec64)"
 182 #else
 183 #if DEFAULT_ARCH64_P
 184 #define ASM_DEFAULT_SPEC "-mppc%{!m32:64}"
 185 #define ASM_SPEC         "%{m32:%(asm_spec32)}%{!m32:%(asm_spec64)} %(asm_spec_common)"
 186 #define LINK_OS_LINUX_SPEC "%{m32:%(link_os_linux_spec32)}%{!m32:%(link_os_linux_spec64)}"
 187 #else
 188 #define ASM_DEFAULT_SPEC "-mppc%{m64:64}"
 189 #define ASM_SPEC         "%{!m64:%(asm_spec32)}%{m64:%(asm_spec64)} %(asm_spec_common)"
 190 #define LINK_OS_LINUX_SPEC "%{!m64:%(link_os_linux_spec32)}%{m64:%(link_os_linux_spec64)}"
 191 #endif
 192 #endif
 193
 194 #define ASM_SPEC32 "-a32 \
 195 %{mrelocatable} %{mrelocatable-lib} %{fpic|fpie|fPIC|fPIE:-K PIC} \
 196 %{memb|msdata=eabi: -memb}"
 197
 198 #define ASM_SPEC64 "-a64"
 199
 200 #define ASM_SPEC_COMMON "%(asm_cpu) \
 201 %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}}" \
 202   ENDIAN_SELECT(" -mbig", " -mlittle", DEFAULT_ASM_ENDIAN)
 203
 204 #undef  SUBSUBTARGET_EXTRA_SPECS
 205 #define SUBSUBTARGET_EXTRA_SPECS \
 206   { "asm_spec_common",          ASM_SPEC_COMMON },                      \
 207   { "asm_spec32",               ASM_SPEC32 },                           \
 208   { "asm_spec64",               ASM_SPEC64 },                           \
 209   { "link_os_linux_spec32",     LINK_OS_LINUX_SPEC32 },                 \
 210   { "link_os_linux_spec64",     LINK_OS_LINUX_SPEC64 },
 211
 212 #undef  MULTILIB_DEFAULTS
 213 #if DEFAULT_ARCH64_P
 214 #define MULTILIB_DEFAULTS { "m64" }
 215 #else
 216 #define MULTILIB_DEFAULTS { "m32" }
 217 #endif
 218
 219 #ifndef RS6000_BI_ARCH
 220
 221 /* 64-bit PowerPC Linux always has a TOC.  */
 222 #undef  TARGET_TOC
 223 #define TARGET_TOC              1
 224
 225 /* Some things from sysv4.h we don't do when 64 bit.  */
 226 #undef  OPTION_RELOCATABLE
 227 #define OPTION_RELOCATABLE      0
 228 #undef  OPTION_EABI
 229 #define OPTION_EABI             0
 230 #undef  OPTION_PROTOTYPE
 231 #define OPTION_PROTOTYPE        0
 232 #undef RELOCATABLE_NEEDS_FIXUP
 233 #define RELOCATABLE_NEEDS_FIXUP 0
 234
 235 #endif
 236
 237 /* We use glibc _mcount for profiling.  */
 238 #define NO_PROFILE_COUNTERS 1
 239 #define PROFILE_HOOK(LABEL) \
 240   do { if (TARGET_64BIT) output_profile_hook (LABEL); } while (0)
 241
 242 /* PowerPC64 Linux word-aligns FP doubles when -malign-power is given.  */
 243 #undef  ADJUST_FIELD_ALIGN
 244 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
 245   (rs6000_special_adjust_field_align_p ((FIELD), (COMPUTED))            \
 246    ? 128                                                                \
 247    : (TARGET_64BIT                                                      \
 248       && TARGET_ALIGN_NATURAL == 0                                      \
 249       && TYPE_MODE (strip_array_types (TREE_TYPE (FIELD))) == DFmode)   \
 250    ? MIN ((COMPUTED), 32)                                               \
 251    : (COMPUTED))
 252
 253 /* PowerPC64 Linux increases natural record alignment to doubleword if
 254    the first field is an FP double, only if in power alignment mode.  */
 255 #undef  ROUND_TYPE_ALIGN
 256 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                   \
 257   ((TARGET_64BIT                                                        \
 258     && (TREE_CODE (STRUCT) == RECORD_TYPE                               \
 259         || TREE_CODE (STRUCT) == UNION_TYPE                             \
 260         || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                       \
 261     && TARGET_ALIGN_NATURAL == 0)                                       \
 262    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)      \
 263    : MAX ((COMPUTED), (SPECIFIED)))
 264
 265 /* Use the default for compiling target libs.  */
 266 #ifdef IN_TARGET_LIBS
 267 #undef TARGET_ALIGN_NATURAL
 268 #define TARGET_ALIGN_NATURAL 1
 269 #endif
 270
 271 /* Indicate that jump tables go in the text section.  */
 272 #undef  JUMP_TABLES_IN_TEXT_SECTION
 273 #define JUMP_TABLES_IN_TEXT_SECTION TARGET_64BIT
 274
 275 /* The linux ppc64 ABI isn't explicit on whether aggregates smaller
 276    than a doubleword should be padded upward or downward.  You could
 277    reasonably assume that they follow the normal rules for structure
 278    layout treating the parameter area as any other block of memory,
 279    then map the reg param area to registers.  i.e. pad upward.
 280    Setting both of the following defines results in this behavior.
 281    Setting just the first one will result in aggregates that fit in a
 282    doubleword being padded downward, and others being padded upward.
 283    Not a bad idea as this results in struct { int x; } being passed
 284    the same way as an int.  */
 285 #define AGGREGATE_PADDING_FIXED TARGET_64BIT
 286 #define AGGREGATES_PAD_UPWARD_ALWAYS 0
 287
 288 /* Specify padding for the last element of a block move between
 289    registers and memory.  FIRST is nonzero if this is the only
 290    element.  */
 291 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 292   (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
 293
 294 /* Linux doesn't support saving and restoring 64-bit regs in a 32-bit
 295    process.  */
 296 #define OS_MISSING_POWERPC64 !TARGET_64BIT
 297
 298 #ifdef SINGLE_LIBC
 299 #define OPTION_GLIBC  (DEFAULT_LIBC == LIBC_GLIBC)
 300 #define OPTION_UCLIBC (DEFAULT_LIBC == LIBC_UCLIBC)
 301 #define OPTION_BIONIC (DEFAULT_LIBC == LIBC_BIONIC)
 302 #else
 303 #define OPTION_GLIBC  (linux_libc == LIBC_GLIBC)
 304 #define OPTION_UCLIBC (linux_libc == LIBC_UCLIBC)
 305 #define OPTION_BIONIC (linux_libc == LIBC_BIONIC)
 306 #endif
 307
 308 /* Determine what functions are present at the runtime;
 309    this includes full c99 runtime and sincos.  */
 310 #undef TARGET_LIBC_HAS_FUNCTION
 311 #define TARGET_LIBC_HAS_FUNCTION linux_libc_has_function
 312
 313 #undef  TARGET_OS_CPP_BUILTINS
 314 #define TARGET_OS_CPP_BUILTINS()                        \
 315   do                                                    \
 316     {                                                   \
 317       if (TARGET_64BIT)                                 \
 318         {                                               \
 319           builtin_define ("__PPC__");                   \
 320           builtin_define ("__PPC64__");                 \
 321           builtin_define ("__powerpc__");               \
 322           builtin_define ("__powerpc64__");             \
 323           if (!DOT_SYMBOLS)                             \
 324             builtin_define ("_CALL_LINUX");             \
 325           builtin_assert ("cpu=powerpc64");             \
 326           builtin_assert ("machine=powerpc64");         \
 327         }                                               \
 328       else                                              \
 329         {                                               \
 330           builtin_define_std ("PPC");                   \
 331           builtin_define_std ("powerpc");               \
 332           builtin_assert ("cpu=powerpc");               \
 333           builtin_assert ("machine=powerpc");           \
 334           TARGET_OS_SYSV_CPP_BUILTINS ();               \
 335         }                                               \
 336     }                                                   \
 337   while (0)
 338
 339 #undef  CPP_OS_DEFAULT_SPEC
 340 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux)"
 341
 342 #undef  LINK_SHLIB_SPEC
 343 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
 344
 345 #undef  LIB_DEFAULT_SPEC
 346 #define LIB_DEFAULT_SPEC "%(lib_linux)"
 347
 348 #undef  STARTFILE_DEFAULT_SPEC
 349 #define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
 350
 351 #undef  ENDFILE_DEFAULT_SPEC
 352 #define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
 353
 354 #undef  LINK_START_DEFAULT_SPEC
 355 #define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
 356
 357 #undef  LINK_OS_DEFAULT_SPEC
 358 #define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
 359
 360 #define GLIBC_DYNAMIC_LINKER32 "/lib/ld.so.1"
 361 #ifdef LINUX64_DEFAULT_ABI_ELFv2
 362 #define GLIBC_DYNAMIC_LINKER64 "%{mabi=elfv1:/lib64/ld64.so.1;:/lib64/ld64.so.2}"
 363 #else
 364 #define GLIBC_DYNAMIC_LINKER64 "%{mabi=elfv2:/lib64/ld64.so.2;:/lib64/ld64.so.1}"
 365 #endif
 366 #define UCLIBC_DYNAMIC_LINKER32 "/lib/ld-uClibc.so.0"
 367 #define UCLIBC_DYNAMIC_LINKER64 "/lib/ld64-uClibc.so.0"
 368 #if DEFAULT_LIBC == LIBC_UCLIBC
 369 #define CHOOSE_DYNAMIC_LINKER(G, U) "%{mglibc:" G ";:" U "}"
 370 #elif DEFAULT_LIBC == LIBC_GLIBC
 371 #define CHOOSE_DYNAMIC_LINKER(G, U) "%{muclibc:" U ";:" G "}"
 372 #else
 373 #error "Unsupported DEFAULT_LIBC"
 374 #endif
 375 #define GNU_USER_DYNAMIC_LINKER32 \
 376   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32)
 377 #define GNU_USER_DYNAMIC_LINKER64 \
 378   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64)
 379
 380 #undef  DEFAULT_ASM_ENDIAN
 381 #if (TARGET_DEFAULT & MASK_LITTLE_ENDIAN)
 382 #define DEFAULT_ASM_ENDIAN " -mlittle"
 383 #define LINK_OS_LINUX_EMUL32 ENDIAN_SELECT(" -m elf32ppclinux",         \
 384                                            " -m elf32lppclinux",        \
 385                                            " -m elf32lppclinux")
 386 #define LINK_OS_LINUX_EMUL64 ENDIAN_SELECT(" -m elf64ppc",              \
 387                                            " -m elf64lppc",             \
 388                                            " -m elf64lppc")
 389 #else
 390 #define DEFAULT_ASM_ENDIAN " -mbig"
 391 #define LINK_OS_LINUX_EMUL32 ENDIAN_SELECT(" -m elf32ppclinux",         \
 392                                            " -m elf32lppclinux",        \
 393                                            " -m elf32ppclinux")
 394 #define LINK_OS_LINUX_EMUL64 ENDIAN_SELECT(" -m elf64ppc",              \
 395                                            " -m elf64lppc",             \
 396                                            " -m elf64ppc")
 397 #endif
 398
 399 #define LINK_OS_LINUX_SPEC32 LINK_OS_LINUX_EMUL32 " %{!shared: %{!static: \
 400   %{rdynamic:-export-dynamic} \
 401   -dynamic-linker " GNU_USER_DYNAMIC_LINKER32 "}}"
 402
 403 #define LINK_OS_LINUX_SPEC64 LINK_OS_LINUX_EMUL64 " %{!shared: %{!static: \
 404   %{rdynamic:-export-dynamic} \
 405   -dynamic-linker " GNU_USER_DYNAMIC_LINKER64 "}}"
 406
 407 #undef  TOC_SECTION_ASM_OP
 408 #define TOC_SECTION_ASM_OP \
 409   (TARGET_64BIT                                         \
 410    ? "\t.section\t\".toc\",\"aw\""                      \
 411    : "\t.section\t\".got\",\"aw\"")
 412
 413 #undef  MINIMAL_TOC_SECTION_ASM_OP
 414 #define MINIMAL_TOC_SECTION_ASM_OP \
 415   (TARGET_64BIT                                         \
 416    ? "\t.section\t\".toc1\",\"aw\""                     \
 417    : ((TARGET_RELOCATABLE || flag_pic)                  \
 418       ? "\t.section\t\".got2\",\"aw\""                  \
 419       : "\t.section\t\".got1\",\"aw\""))
 420
 421 /* Must be at least as big as our pointer type.  */
 422 #undef  SIZE_TYPE
 423 #define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int")
 424
 425 #undef  PTRDIFF_TYPE
 426 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
 427
 428 #undef  WCHAR_TYPE
 429 #define WCHAR_TYPE (TARGET_64BIT ? "int" : "long int")
 430 #undef  WCHAR_TYPE_SIZE
 431 #define WCHAR_TYPE_SIZE 32
 432
 433 #undef  RS6000_MCOUNT
 434 #define RS6000_MCOUNT "_mcount"
 435
 436 #ifdef __powerpc64__
 437 /* _init and _fini functions are built from bits spread across many
 438    object files, each potentially with a different TOC pointer.  For
 439    that reason, place a nop after the call so that the linker can
 440    restore the TOC pointer if a TOC adjusting call stub is needed.  */
 441 #if DOT_SYMBOLS
 442 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 443   asm (SECTION_OP "\n"                                  \
 444 "       bl ." #FUNC "\n"                                \
 445 "       nop\n"                                          \
 446 "       .previous");
 447 #else
 448 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 449   asm (SECTION_OP "\n"                                  \
 450 "       bl " #FUNC "\n"                                 \
 451 "       nop\n"                                          \
 452 "       .previous");
 453 #endif
 454 #endif
 455
 456 /* FP save and restore routines.  */
 457 #undef  SAVE_FP_PREFIX
 458 #define SAVE_FP_PREFIX (TARGET_64BIT ? "._savef" : "_savefpr_")
 459 #undef  SAVE_FP_SUFFIX
 460 #define SAVE_FP_SUFFIX ""
 461 #undef  RESTORE_FP_PREFIX
 462 #define RESTORE_FP_PREFIX (TARGET_64BIT ? "._restf" : "_restfpr_")
 463 #undef  RESTORE_FP_SUFFIX
 464 #define RESTORE_FP_SUFFIX ""
 465
 466 /* Dwarf2 debugging.  */
 467 #undef  PREFERRED_DEBUGGING_TYPE
 468 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 469
 470 /* This is how to declare the size of a function.  */
 471 #undef  ASM_DECLARE_FUNCTION_SIZE
 472 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 473   do                                                                    \
 474     {                                                                   \
 475       if (!flag_inhibit_size_directive)                                 \
 476         {                                                               \
 477           fputs ("\t.size\t", (FILE));                                  \
 478           if (TARGET_64BIT && DOT_SYMBOLS)                              \
 479             putc ('.', (FILE));                                         \
 480           assemble_name ((FILE), (FNAME));                              \
 481           fputs (",.-", (FILE));                                        \
 482           rs6000_output_function_entry (FILE, FNAME);                   \
 483           putc ('\n', (FILE));                                          \
 484         }                                                               \
 485     }                                                                   \
 486   while (0)
 487
 488 /* Return nonzero if this entry is to be written into the constant
 489    pool in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF
 490    or a CONST containing one of them.  If -mfp-in-toc (the default),
 491    we also do this for floating-point constants.  We actually can only
 492    do this if the FP formats of the target and host machines are the
 493    same, but we can't check that since not every file that uses
 494    the macros includes real.h.  We also do this when we can write the
 495    entry into the TOC and the entry is not larger than a TOC entry.  */
 496
 497 #undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
 498 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
 499   (TARGET_TOC                                                           \
 500    && (GET_CODE (X) == SYMBOL_REF                                       \
 501        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
 502            && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)           \
 503        || GET_CODE (X) == LABEL_REF                                     \
 504        || (GET_CODE (X) == CONST_INT                                    \
 505            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
 506        || (GET_CODE (X) == CONST_DOUBLE                                 \
 507            && ((TARGET_64BIT                                            \
 508                 && (TARGET_MINIMAL_TOC                                  \
 509                     || (SCALAR_FLOAT_MODE_P (GET_MODE (X))              \
 510                         && ! TARGET_NO_FP_IN_TOC)))                     \
 511                || (!TARGET_64BIT                                        \
 512                    && !TARGET_NO_FP_IN_TOC                              \
 513                    && !TARGET_RELOCATABLE                               \
 514                    && SCALAR_FLOAT_MODE_P (GET_MODE (X))                \
 515                    && BITS_PER_WORD == HOST_BITS_PER_INT)))))
 516
 517 /* Select a format to encode pointers in exception handling data.  CODE
 518    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
 519    true if the symbol may be affected by dynamic relocations.  */
 520 #undef  ASM_PREFERRED_EH_DATA_FORMAT
 521 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 522   ((TARGET_64BIT || flag_pic || TARGET_RELOCATABLE)                     \
 523    ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel               \
 524       | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4))             \
 525    : DW_EH_PE_absptr)
 526
 527 /* For backward compatibility, we must continue to use the AIX
 528    structure return convention.  */
 529 #undef DRAFT_V4_STRUCT_RET
 530 #define DRAFT_V4_STRUCT_RET (!TARGET_64BIT)
 531
 532 #ifdef TARGET_LIBC_PROVIDES_SSP
 533 /* ppc32 glibc provides __stack_chk_guard in -0x7008(2),
 534    ppc64 glibc provides it at -0x7010(13).  */
 535 #define TARGET_THREAD_SSP_OFFSET        (TARGET_64BIT ? -0x7010 : -0x7008)
 536 #endif
 537
 538 #define POWERPC_LINUX
 539
 540 /* ppc{32,64} linux has 128-bit long double support in glibc 2.4 and later.  */
 541 #ifdef TARGET_DEFAULT_LONG_DOUBLE_128
 542 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
 543 #endif
 544
 545 /* Static stack checking is supported by means of probes.  */
 546 #define STACK_CHECK_STATIC_BUILTIN 1
 547
 548 /* The default value isn't sufficient in 64-bit mode.  */
 549 #define STACK_CHECK_PROTECT (TARGET_64BIT ? 16 * 1024 : 12 * 1024)
 550
 551 /* Software floating point support for exceptions and rounding modes
 552    depends on the C library in use.  */
 553 #undef TARGET_FLOAT_EXCEPTIONS_ROUNDING_SUPPORTED_P
 554 #define TARGET_FLOAT_EXCEPTIONS_ROUNDING_SUPPORTED_P \
 555   rs6000_linux_float_exceptions_rounding_supported_p
 556
 557 /* Support for TARGET_ATOMIC_ASSIGN_EXPAND_FENV without FPRs depends
 558    on glibc 2.19 or greater.  */
 559 #if TARGET_GLIBC_MAJOR > 2 \
 560   || (TARGET_GLIBC_MAJOR == 2 && TARGET_GLIBC_MINOR >= 19)
 561 #define RS6000_GLIBC_ATOMIC_FENV 1
 562 #endif