gcc/config/rs6000/linux64.h

   1 /* Definitions of target machine for GNU compiler,
   2    for 64 bit PowerPC linux.
   3    Copyright (C) 2000-2014 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 #ifdef LINUX64_DEFAULT_ABI_ELFv2
  75 #define PROCESSOR_DEFAULT64 PROCESSOR_POWER8
  76 #else
  77 #define PROCESSOR_DEFAULT64 PROCESSOR_POWER7
  78 #endif
  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   (rs6000_isa_flags & rs6000_isa_flags_explicit & OPTION_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 #ifdef LINUX64_DEFAULT_ABI_ELFv2
  93 #define ELFv2_ABI_CHECK (rs6000_elf_abi != 1)
  94 #else
  95 #define ELFv2_ABI_CHECK (rs6000_elf_abi == 2)
  96 #endif
  97
  98 #undef  SUBSUBTARGET_OVERRIDE_OPTIONS
  99 #define SUBSUBTARGET_OVERRIDE_OPTIONS                           \
 100   do                                                            \
 101     {                                                           \
 102       if (!global_options_set.x_rs6000_alignment_flags)         \
 103         rs6000_alignment_flags = MASK_ALIGN_NATURAL;            \
 104       if (TARGET_64BIT)                                         \
 105         {                                                       \
 106           if (DEFAULT_ABI != ABI_AIX)                           \
 107             {                                                   \
 108               rs6000_current_abi = ABI_AIX;                     \
 109               error (INVALID_64BIT, "call");                    \
 110             }                                                   \
 111           dot_symbols = !strcmp (rs6000_abi_name, "aixdesc");   \
 112           if (ELFv2_ABI_CHECK)                                  \
 113             {                                                   \
 114               rs6000_current_abi = ABI_ELFv2;                   \
 115               if (dot_symbols)                                  \
 116                 error ("-mcall-aixdesc incompatible with -mabi=elfv2"); \
 117             }                                                   \
 118           if (rs6000_isa_flags & OPTION_MASK_RELOCATABLE)       \
 119             {                                                   \
 120               rs6000_isa_flags &= ~OPTION_MASK_RELOCATABLE;     \
 121               error (INVALID_64BIT, "relocatable");             \
 122             }                                                   \
 123           if (rs6000_isa_flags & OPTION_MASK_EABI)              \
 124             {                                                   \
 125               rs6000_isa_flags &= ~OPTION_MASK_EABI;            \
 126               error (INVALID_64BIT, "eabi");                    \
 127             }                                                   \
 128           if (TARGET_PROTOTYPE)                                 \
 129             {                                                   \
 130               target_prototype = 0;                             \
 131               error (INVALID_64BIT, "prototype");               \
 132             }                                                   \
 133           if ((rs6000_isa_flags & OPTION_MASK_POWERPC64) == 0)  \
 134             {                                                   \
 135               rs6000_isa_flags |= OPTION_MASK_POWERPC64;        \
 136               error ("-m64 requires a PowerPC64 cpu");          \
 137             }                                                   \
 138           if ((rs6000_isa_flags_explicit                        \
 139                & OPTION_MASK_MINIMAL_TOC) != 0)                 \
 140             {                                                   \
 141               if (global_options_set.x_rs6000_current_cmodel    \
 142                   && rs6000_current_cmodel != CMODEL_SMALL)     \
 143                 error ("-mcmodel incompatible with other toc options"); \
 144               SET_CMODEL (CMODEL_SMALL);                        \
 145             }                                                   \
 146           else                                                  \
 147             {                                                   \
 148               if (!global_options_set.x_rs6000_current_cmodel)  \
 149                 SET_CMODEL (CMODEL_MEDIUM);                     \
 150               if (rs6000_current_cmodel != CMODEL_SMALL)        \
 151                 {                                               \
 152                   if (!global_options_set.x_TARGET_NO_FP_IN_TOC) \
 153                     TARGET_NO_FP_IN_TOC                         \
 154                       = rs6000_current_cmodel == CMODEL_MEDIUM; \
 155                   if (!global_options_set.x_TARGET_NO_SUM_IN_TOC) \
 156                     TARGET_NO_SUM_IN_TOC = 0;                   \
 157                 }                                               \
 158             }                                                   \
 159         }                                                       \
 160       else                                                      \
 161         {                                                       \
 162           if (!RS6000_BI_ARCH_P)                                \
 163             error (INVALID_32BIT, "32");                        \
 164           if (TARGET_PROFILE_KERNEL)                            \
 165             {                                                   \
 166               TARGET_PROFILE_KERNEL = 0;                        \
 167               error (INVALID_32BIT, "profile-kernel");          \
 168             }                                                   \
 169           if (global_options_set.x_rs6000_current_cmodel)       \
 170             {                                                   \
 171               SET_CMODEL (CMODEL_SMALL);                        \
 172               error (INVALID_32BIT, "cmodel");                  \
 173             }                                                   \
 174         }                                                       \
 175     }                                                           \
 176   while (0)
 177
 178 #undef  ASM_DEFAULT_SPEC
 179 #undef  ASM_SPEC
 180 #undef  LINK_OS_LINUX_SPEC
 181
 182 #ifndef RS6000_BI_ARCH
 183 #define ASM_DEFAULT_SPEC "-mppc64"
 184 #define ASM_SPEC         "%(asm_spec64) %(asm_spec_common)"
 185 #define LINK_OS_LINUX_SPEC "%(link_os_linux_spec64)"
 186 #else
 187 #if DEFAULT_ARCH64_P
 188 #define ASM_DEFAULT_SPEC "-mppc%{!m32:64}"
 189 #define ASM_SPEC         "%{m32:%(asm_spec32)}%{!m32:%(asm_spec64)} %(asm_spec_common)"
 190 #define LINK_OS_LINUX_SPEC "%{m32:%(link_os_linux_spec32)}%{!m32:%(link_os_linux_spec64)}"
 191 #else
 192 #define ASM_DEFAULT_SPEC "-mppc%{m64:64}"
 193 #define ASM_SPEC         "%{!m64:%(asm_spec32)}%{m64:%(asm_spec64)} %(asm_spec_common)"
 194 #define LINK_OS_LINUX_SPEC "%{!m64:%(link_os_linux_spec32)}%{m64:%(link_os_linux_spec64)}"
 195 #endif
 196 #endif
 197
 198 #define ASM_SPEC32 "-a32 \
 199 %{mrelocatable} %{mrelocatable-lib} %{fpic|fpie|fPIC|fPIE:-K PIC} \
 200 %{memb|msdata=eabi: -memb}"
 201
 202 #define ASM_SPEC64 "-a64"
 203
 204 #define ASM_SPEC_COMMON "%(asm_cpu) \
 205 %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}}" \
 206   ENDIAN_SELECT(" -mbig", " -mlittle", DEFAULT_ASM_ENDIAN)
 207
 208 #undef  SUBSUBTARGET_EXTRA_SPECS
 209 #define SUBSUBTARGET_EXTRA_SPECS \
 210   { "asm_spec_common",          ASM_SPEC_COMMON },                      \
 211   { "asm_spec32",               ASM_SPEC32 },                           \
 212   { "asm_spec64",               ASM_SPEC64 },                           \
 213   { "link_os_linux_spec32",     LINK_OS_LINUX_SPEC32 },                 \
 214   { "link_os_linux_spec64",     LINK_OS_LINUX_SPEC64 },
 215
 216 #undef  MULTILIB_DEFAULTS
 217 #if DEFAULT_ARCH64_P
 218 #define MULTILIB_DEFAULTS { "m64" }
 219 #else
 220 #define MULTILIB_DEFAULTS { "m32" }
 221 #endif
 222
 223 #ifndef RS6000_BI_ARCH
 224
 225 /* 64-bit PowerPC Linux always has a TOC.  */
 226 #undef  TARGET_TOC
 227 #define TARGET_TOC              1
 228
 229 /* Some things from sysv4.h we don't do when 64 bit.  */
 230 #undef  OPTION_RELOCATABLE
 231 #define OPTION_RELOCATABLE      0
 232 #undef  OPTION_EABI
 233 #define OPTION_EABI             0
 234 #undef  OPTION_PROTOTYPE
 235 #define OPTION_PROTOTYPE        0
 236 #undef RELOCATABLE_NEEDS_FIXUP
 237 #define RELOCATABLE_NEEDS_FIXUP 0
 238
 239 #endif
 240
 241 /* We use glibc _mcount for profiling.  */
 242 #define NO_PROFILE_COUNTERS 1
 243 #define PROFILE_HOOK(LABEL) \
 244   do { if (TARGET_64BIT) output_profile_hook (LABEL); } while (0)
 245
 246 /* PowerPC64 Linux word-aligns FP doubles when -malign-power is given.  */
 247 #undef  ADJUST_FIELD_ALIGN
 248 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
 249   (rs6000_special_adjust_field_align_p ((FIELD), (COMPUTED))            \
 250    ? 128                                                                \
 251    : (TARGET_64BIT                                                      \
 252       && TARGET_ALIGN_NATURAL == 0                                      \
 253       && TYPE_MODE (strip_array_types (TREE_TYPE (FIELD))) == DFmode)   \
 254    ? MIN ((COMPUTED), 32)                                               \
 255    : (COMPUTED))
 256
 257 /* PowerPC64 Linux increases natural record alignment to doubleword if
 258    the first field is an FP double, only if in power alignment mode.  */
 259 #undef  ROUND_TYPE_ALIGN
 260 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                   \
 261   ((TARGET_64BIT                                                        \
 262     && (TREE_CODE (STRUCT) == RECORD_TYPE                               \
 263         || TREE_CODE (STRUCT) == UNION_TYPE                             \
 264         || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                       \
 265     && TARGET_ALIGN_NATURAL == 0)                                       \
 266    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)      \
 267    : MAX ((COMPUTED), (SPECIFIED)))
 268
 269 /* Use the default for compiling target libs.  */
 270 #ifdef IN_TARGET_LIBS
 271 #undef TARGET_ALIGN_NATURAL
 272 #define TARGET_ALIGN_NATURAL 1
 273 #endif
 274
 275 /* Indicate that jump tables go in the text section.  */
 276 #undef  JUMP_TABLES_IN_TEXT_SECTION
 277 #define JUMP_TABLES_IN_TEXT_SECTION TARGET_64BIT
 278
 279 /* The linux ppc64 ABI isn't explicit on whether aggregates smaller
 280    than a doubleword should be padded upward or downward.  You could
 281    reasonably assume that they follow the normal rules for structure
 282    layout treating the parameter area as any other block of memory,
 283    then map the reg param area to registers.  i.e. pad upward.
 284    Setting both of the following defines results in this behavior.
 285    Setting just the first one will result in aggregates that fit in a
 286    doubleword being padded downward, and others being padded upward.
 287    Not a bad idea as this results in struct { int x; } being passed
 288    the same way as an int.  */
 289 #define AGGREGATE_PADDING_FIXED TARGET_64BIT
 290 #define AGGREGATES_PAD_UPWARD_ALWAYS 0
 291
 292 /* Specify padding for the last element of a block move between
 293    registers and memory.  FIRST is nonzero if this is the only
 294    element.  */
 295 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 296   (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
 297
 298 /* Linux doesn't support saving and restoring 64-bit regs in a 32-bit
 299    process.  */
 300 #define OS_MISSING_POWERPC64 !TARGET_64BIT
 301
 302 #ifdef SINGLE_LIBC
 303 #define OPTION_GLIBC  (DEFAULT_LIBC == LIBC_GLIBC)
 304 #define OPTION_UCLIBC (DEFAULT_LIBC == LIBC_UCLIBC)
 305 #define OPTION_BIONIC (DEFAULT_LIBC == LIBC_BIONIC)
 306 #else
 307 #define OPTION_GLIBC  (linux_libc == LIBC_GLIBC)
 308 #define OPTION_UCLIBC (linux_libc == LIBC_UCLIBC)
 309 #define OPTION_BIONIC (linux_libc == LIBC_BIONIC)
 310 #endif
 311
 312 /* Determine what functions are present at the runtime;
 313    this includes full c99 runtime and sincos.  */
 314 #undef TARGET_LIBC_HAS_FUNCTION
 315 #define TARGET_LIBC_HAS_FUNCTION linux_libc_has_function
 316
 317 #undef  TARGET_OS_CPP_BUILTINS
 318 #define TARGET_OS_CPP_BUILTINS()                        \
 319   do                                                    \
 320     {                                                   \
 321       if (TARGET_64BIT)                                 \
 322         {                                               \
 323           builtin_define ("__PPC__");                   \
 324           builtin_define ("__PPC64__");                 \
 325           builtin_define ("__powerpc__");               \
 326           builtin_define ("__powerpc64__");             \
 327           if (!DOT_SYMBOLS)                             \
 328             builtin_define ("_CALL_LINUX");             \
 329           builtin_assert ("cpu=powerpc64");             \
 330           builtin_assert ("machine=powerpc64");         \
 331         }                                               \
 332       else                                              \
 333         {                                               \
 334           builtin_define_std ("PPC");                   \
 335           builtin_define_std ("powerpc");               \
 336           builtin_assert ("cpu=powerpc");               \
 337           builtin_assert ("machine=powerpc");           \
 338           TARGET_OS_SYSV_CPP_BUILTINS ();               \
 339         }                                               \
 340     }                                                   \
 341   while (0)
 342
 343 #undef  CPP_OS_DEFAULT_SPEC
 344 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux)"
 345
 346 #undef  LINK_SHLIB_SPEC
 347 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
 348
 349 #undef  LIB_DEFAULT_SPEC
 350 #define LIB_DEFAULT_SPEC "%(lib_linux)"
 351
 352 #undef  STARTFILE_DEFAULT_SPEC
 353 #define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
 354
 355 #undef  ENDFILE_DEFAULT_SPEC
 356 #define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
 357
 358 #undef  LINK_START_DEFAULT_SPEC
 359 #define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
 360
 361 #undef  LINK_OS_DEFAULT_SPEC
 362 #define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
 363
 364 #define GLIBC_DYNAMIC_LINKER32 "/lib/ld.so.1"
 365 #ifdef LINUX64_DEFAULT_ABI_ELFv2
 366 #define GLIBC_DYNAMIC_LINKER64 "%{mabi=elfv1:/lib64/ld64.so.1;:/lib64/ld64.so.2}"
 367 #else
 368 #define GLIBC_DYNAMIC_LINKER64 "%{mabi=elfv2:/lib64/ld64.so.2;:/lib64/ld64.so.1}"
 369 #endif
 370 #define UCLIBC_DYNAMIC_LINKER32 "/lib/ld-uClibc.so.0"
 371 #define UCLIBC_DYNAMIC_LINKER64 "/lib/ld64-uClibc.so.0"
 372 #if DEFAULT_LIBC == LIBC_UCLIBC
 373 #define CHOOSE_DYNAMIC_LINKER(G, U) "%{mglibc:" G ";:" U "}"
 374 #elif DEFAULT_LIBC == LIBC_GLIBC
 375 #define CHOOSE_DYNAMIC_LINKER(G, U) "%{muclibc:" U ";:" G "}"
 376 #else
 377 #error "Unsupported DEFAULT_LIBC"
 378 #endif
 379 #define GNU_USER_DYNAMIC_LINKER32 \
 380   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32)
 381 #define GNU_USER_DYNAMIC_LINKER64 \
 382   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64)
 383
 384 #undef  DEFAULT_ASM_ENDIAN
 385 #if (TARGET_DEFAULT & MASK_LITTLE_ENDIAN)
 386 #define DEFAULT_ASM_ENDIAN " -mlittle"
 387 #define LINK_OS_LINUX_EMUL32 ENDIAN_SELECT(" -m elf32ppclinux",         \
 388                                            " -m elf32lppclinux",        \
 389                                            " -m elf32lppclinux")
 390 #define LINK_OS_LINUX_EMUL64 ENDIAN_SELECT(" -m elf64ppc",              \
 391                                            " -m elf64lppc",             \
 392                                            " -m elf64lppc")
 393 #else
 394 #define DEFAULT_ASM_ENDIAN " -mbig"
 395 #define LINK_OS_LINUX_EMUL32 ENDIAN_SELECT(" -m elf32ppclinux",         \
 396                                            " -m elf32lppclinux",        \
 397                                            " -m elf32ppclinux")
 398 #define LINK_OS_LINUX_EMUL64 ENDIAN_SELECT(" -m elf64ppc",              \
 399                                            " -m elf64lppc",             \
 400                                            " -m elf64ppc")
 401 #endif
 402
 403 #define LINK_OS_LINUX_SPEC32 LINK_OS_LINUX_EMUL32 " %{!shared: %{!static: \
 404   %{rdynamic:-export-dynamic} \
 405   -dynamic-linker " GNU_USER_DYNAMIC_LINKER32 "}}"
 406
 407 #define LINK_OS_LINUX_SPEC64 LINK_OS_LINUX_EMUL64 " %{!shared: %{!static: \
 408   %{rdynamic:-export-dynamic} \
 409   -dynamic-linker " GNU_USER_DYNAMIC_LINKER64 "}}"
 410
 411 #undef  TOC_SECTION_ASM_OP
 412 #define TOC_SECTION_ASM_OP \
 413   (TARGET_64BIT                                         \
 414    ? "\t.section\t\".toc\",\"aw\""                      \
 415    : "\t.section\t\".got\",\"aw\"")
 416
 417 #undef  MINIMAL_TOC_SECTION_ASM_OP
 418 #define MINIMAL_TOC_SECTION_ASM_OP \
 419   (TARGET_64BIT                                         \
 420    ? "\t.section\t\".toc1\",\"aw\""                     \
 421    : ((TARGET_RELOCATABLE || flag_pic)                  \
 422       ? "\t.section\t\".got2\",\"aw\""                  \
 423       : "\t.section\t\".got1\",\"aw\""))
 424
 425 /* Must be at least as big as our pointer type.  */
 426 #undef  SIZE_TYPE
 427 #define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int")
 428
 429 #undef  PTRDIFF_TYPE
 430 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
 431
 432 #undef  WCHAR_TYPE
 433 #define WCHAR_TYPE (TARGET_64BIT ? "int" : "long int")
 434 #undef  WCHAR_TYPE_SIZE
 435 #define WCHAR_TYPE_SIZE 32
 436
 437 #undef  RS6000_MCOUNT
 438 #define RS6000_MCOUNT "_mcount"
 439
 440 #ifdef __powerpc64__
 441 /* _init and _fini functions are built from bits spread across many
 442    object files, each potentially with a different TOC pointer.  For
 443    that reason, place a nop after the call so that the linker can
 444    restore the TOC pointer if a TOC adjusting call stub is needed.  */
 445 #if DOT_SYMBOLS
 446 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 447   asm (SECTION_OP "\n"                                  \
 448 "       bl ." #FUNC "\n"                                \
 449 "       nop\n"                                          \
 450 "       .previous");
 451 #else
 452 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 453   asm (SECTION_OP "\n"                                  \
 454 "       bl " #FUNC "\n"                                 \
 455 "       nop\n"                                          \
 456 "       .previous");
 457 #endif
 458 #endif
 459
 460 /* FP save and restore routines.  */
 461 #undef  SAVE_FP_PREFIX
 462 #define SAVE_FP_PREFIX (TARGET_64BIT ? "._savef" : "_savefpr_")
 463 #undef  SAVE_FP_SUFFIX
 464 #define SAVE_FP_SUFFIX ""
 465 #undef  RESTORE_FP_PREFIX
 466 #define RESTORE_FP_PREFIX (TARGET_64BIT ? "._restf" : "_restfpr_")
 467 #undef  RESTORE_FP_SUFFIX
 468 #define RESTORE_FP_SUFFIX ""
 469
 470 /* Dwarf2 debugging.  */
 471 #undef  PREFERRED_DEBUGGING_TYPE
 472 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 473
 474 /* This is how to declare the size of a function.  */
 475 #undef  ASM_DECLARE_FUNCTION_SIZE
 476 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 477   do                                                                    \
 478     {                                                                   \
 479       if (!flag_inhibit_size_directive)                                 \
 480         {                                                               \
 481           fputs ("\t.size\t", (FILE));                                  \
 482           if (TARGET_64BIT && DOT_SYMBOLS)                              \
 483             putc ('.', (FILE));                                         \
 484           assemble_name ((FILE), (FNAME));                              \
 485           fputs (",.-", (FILE));                                        \
 486           rs6000_output_function_entry (FILE, FNAME);                   \
 487           putc ('\n', (FILE));                                          \
 488         }                                                               \
 489     }                                                                   \
 490   while (0)
 491
 492 /* Return nonzero if this entry is to be written into the constant
 493    pool in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF
 494    or a CONST containing one of them.  If -mfp-in-toc (the default),
 495    we also do this for floating-point constants.  We actually can only
 496    do this if the FP formats of the target and host machines are the
 497    same, but we can't check that since not every file that uses
 498    the macros includes real.h.  We also do this when we can write the
 499    entry into the TOC and the entry is not larger than a TOC entry.  */
 500
 501 #undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
 502 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
 503   (TARGET_TOC                                                           \
 504    && (GET_CODE (X) == SYMBOL_REF                                       \
 505        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
 506            && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)           \
 507        || GET_CODE (X) == LABEL_REF                                     \
 508        || (GET_CODE (X) == CONST_INT                                    \
 509            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
 510        || (GET_CODE (X) == CONST_DOUBLE                                 \
 511            && ((TARGET_64BIT                                            \
 512                 && (TARGET_MINIMAL_TOC                                  \
 513                     || (SCALAR_FLOAT_MODE_P (GET_MODE (X))              \
 514                         && ! TARGET_NO_FP_IN_TOC)))                     \
 515                || (!TARGET_64BIT                                        \
 516                    && !TARGET_NO_FP_IN_TOC                              \
 517                    && !TARGET_RELOCATABLE                               \
 518                    && SCALAR_FLOAT_MODE_P (GET_MODE (X))                \
 519                    && BITS_PER_WORD == HOST_BITS_PER_INT)))))
 520
 521 /* Select a format to encode pointers in exception handling data.  CODE
 522    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
 523    true if the symbol may be affected by dynamic relocations.  */
 524 #undef  ASM_PREFERRED_EH_DATA_FORMAT
 525 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 526   ((TARGET_64BIT || flag_pic || TARGET_RELOCATABLE)                     \
 527    ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel               \
 528       | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4))             \
 529    : DW_EH_PE_absptr)
 530
 531 /* For backward compatibility, we must continue to use the AIX
 532    structure return convention.  */
 533 #undef DRAFT_V4_STRUCT_RET
 534 #define DRAFT_V4_STRUCT_RET (!TARGET_64BIT)
 535
 536 #ifdef TARGET_LIBC_PROVIDES_SSP
 537 /* ppc32 glibc provides __stack_chk_guard in -0x7008(2),
 538    ppc64 glibc provides it at -0x7010(13).  */
 539 #define TARGET_THREAD_SSP_OFFSET        (TARGET_64BIT ? -0x7010 : -0x7008)
 540 #endif
 541
 542 #define POWERPC_LINUX
 543
 544 /* ppc{32,64} linux has 128-bit long double support in glibc 2.4 and later.  */
 545 #ifdef TARGET_DEFAULT_LONG_DOUBLE_128
 546 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
 547 #endif
 548
 549 /* Static stack checking is supported by means of probes.  */
 550 #define STACK_CHECK_STATIC_BUILTIN 1
 551
 552 /* The default value isn't sufficient in 64-bit mode.  */
 553 #define STACK_CHECK_PROTECT (TARGET_64BIT ? 16 * 1024 : 12 * 1024)
 554
 555 /* Software floating point support for exceptions and rounding modes
 556    depends on the C library in use.  */
 557 #undef TARGET_FLOAT_EXCEPTIONS_ROUNDING_SUPPORTED_P
 558 #define TARGET_FLOAT_EXCEPTIONS_ROUNDING_SUPPORTED_P \
 559   rs6000_linux_float_exceptions_rounding_supported_p