gcc/config/powerpcspe/linux64.h

   1 /* Definitions of target machine for GNU compiler,
   2    for 64 bit PowerPC linux.
   3    Copyright (C) 2000-2017 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 #undef TARGET_KEEP_LEAF_WHEN_PROFILED
  63 #define TARGET_KEEP_LEAF_WHEN_PROFILED rs6000_keep_leaf_when_profiled
  64
  65 #define TARGET_USES_LINUX64_OPT 1
  66 #ifdef HAVE_LD_LARGE_TOC
  67 #undef TARGET_CMODEL
  68 #define TARGET_CMODEL rs6000_current_cmodel
  69 #define SET_CMODEL(opt) rs6000_current_cmodel = opt
  70 #else
  71 #define SET_CMODEL(opt) do {} while (0)
  72 #endif
  73
  74 #undef  PROCESSOR_DEFAULT
  75 #define PROCESSOR_DEFAULT PROCESSOR_POWER7
  76 #undef  PROCESSOR_DEFAULT64
  77 #define PROCESSOR_DEFAULT64 PROCESSOR_POWER8
  78
  79 /* We don't need to generate entries in .fixup, except when
  80    -mrelocatable or -mrelocatable-lib is given.  */
  81 #undef RELOCATABLE_NEEDS_FIXUP
  82 #define RELOCATABLE_NEEDS_FIXUP \
  83   (rs6000_isa_flags & rs6000_isa_flags_explicit & OPTION_MASK_RELOCATABLE)
  84
  85 #undef  RS6000_ABI_NAME
  86 #define RS6000_ABI_NAME "linux"
  87
  88 #define INVALID_64BIT "-m%s not supported in this configuration"
  89 #define INVALID_32BIT INVALID_64BIT
  90
  91 #ifdef LINUX64_DEFAULT_ABI_ELFv2
  92 #define ELFv2_ABI_CHECK (rs6000_elf_abi != 1)
  93 #else
  94 #define ELFv2_ABI_CHECK (rs6000_elf_abi == 2)
  95 #endif
  96
  97 #undef  SUBSUBTARGET_OVERRIDE_OPTIONS
  98 #define SUBSUBTARGET_OVERRIDE_OPTIONS                           \
  99   do                                                            \
 100     {                                                           \
 101       if (!global_options_set.x_rs6000_alignment_flags)         \
 102         rs6000_alignment_flags = MASK_ALIGN_NATURAL;            \
 103       if (rs6000_isa_flags & OPTION_MASK_64BIT)                 \
 104         {                                                       \
 105           if (DEFAULT_ABI != ABI_AIX)                           \
 106             {                                                   \
 107               rs6000_current_abi = ABI_AIX;                     \
 108               error (INVALID_64BIT, "call");                    \
 109             }                                                   \
 110           dot_symbols = !strcmp (rs6000_abi_name, "aixdesc");   \
 111           if (ELFv2_ABI_CHECK)                                  \
 112             {                                                   \
 113               rs6000_current_abi = ABI_ELFv2;                   \
 114               if (dot_symbols)                                  \
 115                 error ("-mcall-aixdesc incompatible with -mabi=elfv2"); \
 116             }                                                   \
 117           if (rs6000_isa_flags & OPTION_MASK_RELOCATABLE)       \
 118             {                                                   \
 119               rs6000_isa_flags &= ~OPTION_MASK_RELOCATABLE;     \
 120               error (INVALID_64BIT, "relocatable");             \
 121             }                                                   \
 122           if (rs6000_isa_flags & OPTION_MASK_EABI)              \
 123             {                                                   \
 124               rs6000_isa_flags &= ~OPTION_MASK_EABI;            \
 125               error (INVALID_64BIT, "eabi");                    \
 126             }                                                   \
 127           if (TARGET_PROTOTYPE)                                 \
 128             {                                                   \
 129               target_prototype = 0;                             \
 130               error (INVALID_64BIT, "prototype");               \
 131             }                                                   \
 132           if ((rs6000_isa_flags & OPTION_MASK_POWERPC64) == 0)  \
 133             {                                                   \
 134               rs6000_isa_flags |= OPTION_MASK_POWERPC64;        \
 135               error ("-m64 requires a PowerPC64 cpu");          \
 136             }                                                   \
 137           if ((rs6000_isa_flags_explicit                        \
 138                & OPTION_MASK_MINIMAL_TOC) != 0)                 \
 139             {                                                   \
 140               if (global_options_set.x_rs6000_current_cmodel    \
 141                   && rs6000_current_cmodel != CMODEL_SMALL)     \
 142                 error ("-mcmodel incompatible with other toc options"); \
 143               SET_CMODEL (CMODEL_SMALL);                        \
 144             }                                                   \
 145           else                                                  \
 146             {                                                   \
 147               if (!global_options_set.x_rs6000_current_cmodel)  \
 148                 SET_CMODEL (CMODEL_MEDIUM);                     \
 149               if (rs6000_current_cmodel != CMODEL_SMALL)        \
 150                 {                                               \
 151                   if (!global_options_set.x_TARGET_NO_FP_IN_TOC) \
 152                     TARGET_NO_FP_IN_TOC                         \
 153                       = rs6000_current_cmodel == CMODEL_MEDIUM; \
 154                   if (!global_options_set.x_TARGET_NO_SUM_IN_TOC) \
 155                     TARGET_NO_SUM_IN_TOC = 0;                   \
 156                 }                                               \
 157             }                                                   \
 158         }                                                       \
 159       else                                                      \
 160         {                                                       \
 161           if (!RS6000_BI_ARCH_P)                                \
 162             error (INVALID_32BIT, "32");                        \
 163           if (TARGET_PROFILE_KERNEL)                            \
 164             {                                                   \
 165               TARGET_PROFILE_KERNEL = 0;                        \
 166               error (INVALID_32BIT, "profile-kernel");          \
 167             }                                                   \
 168           if (global_options_set.x_rs6000_current_cmodel)       \
 169             {                                                   \
 170               SET_CMODEL (CMODEL_SMALL);                        \
 171               error (INVALID_32BIT, "cmodel");                  \
 172             }                                                   \
 173         }                                                       \
 174     }                                                           \
 175   while (0)
 176
 177 #undef  ASM_DEFAULT_SPEC
 178 #undef  ASM_SPEC
 179 #undef  LINK_OS_LINUX_SPEC
 180 #undef  LINK_SECURE_PLT_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 #define LINK_SECURE_PLT_SPEC ""
 187 #else
 188 #if DEFAULT_ARCH64_P
 189 #define ASM_DEFAULT_SPEC "-mppc%{!m32:64}"
 190 #define ASM_SPEC         "%{m32:%(asm_spec32)}%{!m32:%(asm_spec64)} %(asm_spec_common)"
 191 #define LINK_OS_LINUX_SPEC "%{m32:%(link_os_linux_spec32)}%{!m32:%(link_os_linux_spec64)}"
 192 #define LINK_SECURE_PLT_SPEC "%{m32: " LINK_SECURE_PLT_DEFAULT_SPEC "}"
 193 #else
 194 #define ASM_DEFAULT_SPEC "-mppc%{m64:64}"
 195 #define ASM_SPEC         "%{!m64:%(asm_spec32)}%{m64:%(asm_spec64)} %(asm_spec_common)"
 196 #define LINK_OS_LINUX_SPEC "%{!m64:%(link_os_linux_spec32)}%{m64:%(link_os_linux_spec64)}"
 197 #define LINK_SECURE_PLT_SPEC "%{!m64: " LINK_SECURE_PLT_DEFAULT_SPEC "}"
 198 #endif
 199 #endif
 200
 201 #define ASM_SPEC32 "-a32 \
 202 %{mrelocatable} %{mrelocatable-lib} %{" FPIE_OR_FPIC_SPEC ":-K PIC} \
 203 %{memb|msdata=eabi: -memb}"
 204
 205 #define ASM_SPEC64 "-a64"
 206
 207 #define ASM_SPEC_COMMON "%(asm_cpu) \
 208 %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}}" \
 209   ENDIAN_SELECT(" -mbig", " -mlittle", DEFAULT_ASM_ENDIAN)
 210
 211 #undef  SUBSUBTARGET_EXTRA_SPECS
 212 #define SUBSUBTARGET_EXTRA_SPECS \
 213   { "asm_spec_common",          ASM_SPEC_COMMON },                      \
 214   { "asm_spec32",               ASM_SPEC32 },                           \
 215   { "asm_spec64",               ASM_SPEC64 },                           \
 216   { "link_os_linux_spec32",     LINK_OS_LINUX_SPEC32 },                 \
 217   { "link_os_linux_spec64",     LINK_OS_LINUX_SPEC64 },                 \
 218   { "link_os_extra_spec32",     LINK_OS_EXTRA_SPEC32 },                 \
 219   { "link_os_extra_spec64",     LINK_OS_EXTRA_SPEC64 },                 \
 220   { "link_os_new_dtags",        LINK_OS_NEW_DTAGS_SPEC },               \
 221   { "include_extra",            INCLUDE_EXTRA_SPEC },                   \
 222   { "dynamic_linker_prefix",    DYNAMIC_LINKER_PREFIX },
 223
 224 /* Optional specs used for overriding the system include directory, default
 225    -rpath links, and prefix for the dynamic linker.  Normally, there are not
 226    defined, but if the user configure with the --with-advance-toolchain=<xxx>
 227    option, the advance-toolchain.h file will override these.  */
 228 #ifndef INCLUDE_EXTRA_SPEC
 229 #define INCLUDE_EXTRA_SPEC      ""
 230 #endif
 231
 232 #ifndef LINK_OS_EXTRA_SPEC32
 233 #define LINK_OS_EXTRA_SPEC32    ""
 234 #endif
 235
 236 #ifndef LINK_OS_EXTRA_SPEC64
 237 #define LINK_OS_EXTRA_SPEC64    ""
 238 #endif
 239
 240 #ifndef LINK_OS_NEW_DTAGS_SPEC
 241 #define LINK_OS_NEW_DTAGS_SPEC  ""
 242 #endif
 243
 244 #ifndef DYNAMIC_LINKER_PREFIX
 245 #define DYNAMIC_LINKER_PREFIX   ""
 246 #endif
 247
 248 #undef  MULTILIB_DEFAULTS
 249 #if DEFAULT_ARCH64_P
 250 #define MULTILIB_DEFAULTS { "m64" }
 251 #else
 252 #define MULTILIB_DEFAULTS { "m32" }
 253 #endif
 254
 255 /* Split stack is only supported for 64 bit, and requires glibc >= 2.18.  */
 256 #if TARGET_GLIBC_MAJOR * 1000 + TARGET_GLIBC_MINOR >= 2018
 257 # ifndef RS6000_BI_ARCH
 258 #  define TARGET_CAN_SPLIT_STACK
 259 # else
 260 #  if DEFAULT_ARCH64_P
 261 /* Supported, and the default is -m64  */
 262 #   define TARGET_CAN_SPLIT_STACK_64BIT 1
 263 #  else
 264 /* Supported, and the default is -m32  */
 265 #   define TARGET_CAN_SPLIT_STACK_64BIT 0
 266 #  endif
 267 # endif
 268 #endif
 269
 270 #ifndef RS6000_BI_ARCH
 271
 272 /* 64-bit PowerPC Linux always has a TOC.  */
 273 #undef  TARGET_TOC
 274 #define TARGET_TOC              1
 275
 276 /* Some things from sysv4.h we don't do when 64 bit.  */
 277 #undef  OPTION_RELOCATABLE
 278 #define OPTION_RELOCATABLE      0
 279 #undef  OPTION_EABI
 280 #define OPTION_EABI             0
 281 #undef  OPTION_PROTOTYPE
 282 #define OPTION_PROTOTYPE        0
 283 #undef RELOCATABLE_NEEDS_FIXUP
 284 #define RELOCATABLE_NEEDS_FIXUP 0
 285
 286 #endif
 287
 288 /* We use glibc _mcount for profiling.  */
 289 #define NO_PROFILE_COUNTERS 1
 290 #define PROFILE_HOOK(LABEL) \
 291   do { if (TARGET_64BIT) output_profile_hook (LABEL); } while (0)
 292
 293 /* PowerPC64 Linux word-aligns FP doubles when -malign-power is given.  */
 294 #undef  ADJUST_FIELD_ALIGN
 295 #define ADJUST_FIELD_ALIGN(FIELD, TYPE, COMPUTED) \
 296   (rs6000_special_adjust_field_align_p ((TYPE), (COMPUTED))             \
 297    ? 128                                                                \
 298    : (TARGET_64BIT                                                      \
 299       && TARGET_ALIGN_NATURAL == 0                                      \
 300       && TYPE_MODE (strip_array_types (TYPE)) == DFmode)                \
 301    ? MIN ((COMPUTED), 32)                                               \
 302    : (COMPUTED))
 303
 304 /* PowerPC64 Linux increases natural record alignment to doubleword if
 305    the first field is an FP double, only if in power alignment mode.  */
 306 #undef  ROUND_TYPE_ALIGN
 307 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                   \
 308   ((TARGET_64BIT                                                        \
 309     && (TREE_CODE (STRUCT) == RECORD_TYPE                               \
 310         || TREE_CODE (STRUCT) == UNION_TYPE                             \
 311         || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                       \
 312     && TARGET_ALIGN_NATURAL == 0)                                       \
 313    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)      \
 314    : MAX ((COMPUTED), (SPECIFIED)))
 315
 316 /* Use the default for compiling target libs.  */
 317 #ifdef IN_TARGET_LIBS
 318 #undef TARGET_ALIGN_NATURAL
 319 #define TARGET_ALIGN_NATURAL 1
 320 #endif
 321
 322 /* Indicate that jump tables go in the text section.  */
 323 #undef  JUMP_TABLES_IN_TEXT_SECTION
 324 #define JUMP_TABLES_IN_TEXT_SECTION TARGET_64BIT
 325
 326 /* The linux ppc64 ABI isn't explicit on whether aggregates smaller
 327    than a doubleword should be padded upward or downward.  You could
 328    reasonably assume that they follow the normal rules for structure
 329    layout treating the parameter area as any other block of memory,
 330    then map the reg param area to registers.  i.e. pad upward.
 331    Setting both of the following defines results in this behavior.
 332    Setting just the first one will result in aggregates that fit in a
 333    doubleword being padded downward, and others being padded upward.
 334    Not a bad idea as this results in struct { int x; } being passed
 335    the same way as an int.  */
 336 #define AGGREGATE_PADDING_FIXED TARGET_64BIT
 337 #define AGGREGATES_PAD_UPWARD_ALWAYS 0
 338
 339 /* Specify padding for the last element of a block move between
 340    registers and memory.  FIRST is nonzero if this is the only
 341    element.  */
 342 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 343   (!(FIRST) ? PAD_UPWARD : targetm.calls.function_arg_padding (MODE, TYPE))
 344
 345 /* Linux doesn't support saving and restoring 64-bit regs in a 32-bit
 346    process.  */
 347 #define OS_MISSING_POWERPC64 !TARGET_64BIT
 348
 349 #ifdef SINGLE_LIBC
 350 #define OPTION_GLIBC  (DEFAULT_LIBC == LIBC_GLIBC)
 351 #define OPTION_UCLIBC (DEFAULT_LIBC == LIBC_UCLIBC)
 352 #define OPTION_BIONIC (DEFAULT_LIBC == LIBC_BIONIC)
 353 #undef OPTION_MUSL
 354 #define OPTION_MUSL   (DEFAULT_LIBC == LIBC_MUSL)
 355 #else
 356 #define OPTION_GLIBC  (linux_libc == LIBC_GLIBC)
 357 #define OPTION_UCLIBC (linux_libc == LIBC_UCLIBC)
 358 #define OPTION_BIONIC (linux_libc == LIBC_BIONIC)
 359 #undef OPTION_MUSL
 360 #define OPTION_MUSL   (linux_libc == LIBC_MUSL)
 361 #endif
 362
 363 /* Determine what functions are present at the runtime;
 364    this includes full c99 runtime and sincos.  */
 365 #undef TARGET_LIBC_HAS_FUNCTION
 366 #define TARGET_LIBC_HAS_FUNCTION linux_libc_has_function
 367
 368 #undef  TARGET_OS_CPP_BUILTINS
 369 #define TARGET_OS_CPP_BUILTINS()                        \
 370   do                                                    \
 371     {                                                   \
 372       if (TARGET_64BIT)                                 \
 373         {                                               \
 374           builtin_define ("__PPC__");                   \
 375           builtin_define ("__PPC64__");                 \
 376           builtin_define ("__powerpc__");               \
 377           builtin_define ("__powerpc64__");             \
 378           if (!DOT_SYMBOLS)                             \
 379             builtin_define ("_CALL_LINUX");             \
 380           builtin_assert ("cpu=powerpc64");             \
 381           builtin_assert ("machine=powerpc64");         \
 382         }                                               \
 383       else                                              \
 384         {                                               \
 385           builtin_define_std ("PPC");                   \
 386           builtin_define_std ("powerpc");               \
 387           builtin_assert ("cpu=powerpc");               \
 388           builtin_assert ("machine=powerpc");           \
 389           TARGET_OS_SYSV_CPP_BUILTINS ();               \
 390         }                                               \
 391     }                                                   \
 392   while (0)
 393
 394 #undef  CPP_OS_DEFAULT_SPEC
 395 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux) %(include_extra)"
 396
 397 #undef  LINK_SHLIB_SPEC
 398 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
 399
 400 #undef  LIB_DEFAULT_SPEC
 401 #define LIB_DEFAULT_SPEC "%(lib_linux)"
 402
 403 #undef  STARTFILE_DEFAULT_SPEC
 404 #define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
 405
 406 #undef  ENDFILE_DEFAULT_SPEC
 407 #define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
 408
 409 #undef  LINK_START_DEFAULT_SPEC
 410 #define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
 411
 412 #undef  LINK_OS_DEFAULT_SPEC
 413 #define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
 414
 415 #define GLIBC_DYNAMIC_LINKER32 "%(dynamic_linker_prefix)/lib/ld.so.1"
 416
 417 #ifdef LINUX64_DEFAULT_ABI_ELFv2
 418 #define GLIBC_DYNAMIC_LINKER64 \
 419 "%{mabi=elfv1:%(dynamic_linker_prefix)/lib64/ld64.so.1;" \
 420 ":%(dynamic_linker_prefix)/lib64/ld64.so.2}"
 421 #else
 422 #define GLIBC_DYNAMIC_LINKER64 \
 423 "%{mabi=elfv2:%(dynamic_linker_prefix)/lib64/ld64.so.2;" \
 424 ":%(dynamic_linker_prefix)/lib64/ld64.so.1}"
 425 #endif
 426
 427 #define MUSL_DYNAMIC_LINKER32 \
 428   "/lib/ld-musl-powerpc" MUSL_DYNAMIC_LINKER_E "%{msoft-float:-sf}.so.1"
 429 #define MUSL_DYNAMIC_LINKER64 \
 430   "/lib/ld-musl-powerpc64" MUSL_DYNAMIC_LINKER_E "%{msoft-float:-sf}.so.1"
 431
 432 #define UCLIBC_DYNAMIC_LINKER32 "/lib/ld-uClibc.so.0"
 433 #define UCLIBC_DYNAMIC_LINKER64 "/lib/ld64-uClibc.so.0"
 434 #if DEFAULT_LIBC == LIBC_UCLIBC
 435 #define CHOOSE_DYNAMIC_LINKER(G, U, M) \
 436   "%{mglibc:" G ";:%{mmusl:" M ";:" U "}}"
 437 #elif DEFAULT_LIBC == LIBC_GLIBC
 438 #define CHOOSE_DYNAMIC_LINKER(G, U, M) \
 439   "%{muclibc:" U ";:%{mmusl:" M ";:" G "}}"
 440 #elif DEFAULT_LIBC == LIBC_MUSL
 441 #define CHOOSE_DYNAMIC_LINKER(G, U, M) \
 442   "%{mglibc:" G ";:%{muclibc:" U ";:" M "}}"
 443 #else
 444 #error "Unsupported DEFAULT_LIBC"
 445 #endif
 446 #define GNU_USER_DYNAMIC_LINKER32 \
 447   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32, \
 448                          MUSL_DYNAMIC_LINKER32)
 449 #define GNU_USER_DYNAMIC_LINKER64 \
 450   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64, \
 451                          MUSL_DYNAMIC_LINKER64)
 452
 453 #undef  DEFAULT_ASM_ENDIAN
 454 #if (TARGET_DEFAULT & MASK_LITTLE_ENDIAN)
 455 #define DEFAULT_ASM_ENDIAN " -mlittle"
 456 #define LINK_OS_LINUX_EMUL32 ENDIAN_SELECT(" -m elf32ppclinux",         \
 457                                            " -m elf32lppclinux",        \
 458                                            " -m elf32lppclinux")
 459 #define LINK_OS_LINUX_EMUL64 ENDIAN_SELECT(" -m elf64ppc",              \
 460                                            " -m elf64lppc",             \
 461                                            " -m elf64lppc")
 462 #else
 463 #define DEFAULT_ASM_ENDIAN " -mbig"
 464 #define LINK_OS_LINUX_EMUL32 ENDIAN_SELECT(" -m elf32ppclinux",         \
 465                                            " -m elf32lppclinux",        \
 466                                            " -m elf32ppclinux")
 467 #define LINK_OS_LINUX_EMUL64 ENDIAN_SELECT(" -m elf64ppc",              \
 468                                            " -m elf64lppc",             \
 469                                            " -m elf64ppc")
 470 #endif
 471
 472 #define LINK_OS_LINUX_SPEC32 LINK_OS_LINUX_EMUL32 " %{!shared: %{!static: \
 473   %{rdynamic:-export-dynamic} \
 474   -dynamic-linker " GNU_USER_DYNAMIC_LINKER32 "}} \
 475   %(link_os_extra_spec32)"
 476
 477 #define LINK_OS_LINUX_SPEC64 LINK_OS_LINUX_EMUL64 " %{!shared: %{!static: \
 478   %{rdynamic:-export-dynamic} \
 479   -dynamic-linker " GNU_USER_DYNAMIC_LINKER64 "}} \
 480   %(link_os_extra_spec64)"
 481
 482 #undef  TOC_SECTION_ASM_OP
 483 #define TOC_SECTION_ASM_OP \
 484   (TARGET_64BIT                                         \
 485    ? "\t.section\t\".toc\",\"aw\""                      \
 486    : "\t.section\t\".got\",\"aw\"")
 487
 488 #undef  MINIMAL_TOC_SECTION_ASM_OP
 489 #define MINIMAL_TOC_SECTION_ASM_OP \
 490   (TARGET_64BIT                                         \
 491    ? "\t.section\t\".toc1\",\"aw\""                     \
 492    : (flag_pic                                          \
 493       ? "\t.section\t\".got2\",\"aw\""                  \
 494       : "\t.section\t\".got1\",\"aw\""))
 495
 496 /* Must be at least as big as our pointer type.  */
 497 #undef  SIZE_TYPE
 498 #define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int")
 499
 500 #undef  PTRDIFF_TYPE
 501 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
 502
 503 #undef  WCHAR_TYPE
 504 #define WCHAR_TYPE (TARGET_64BIT ? "int" : "long int")
 505 #undef  WCHAR_TYPE_SIZE
 506 #define WCHAR_TYPE_SIZE 32
 507
 508 #undef  RS6000_MCOUNT
 509 #define RS6000_MCOUNT "_mcount"
 510
 511 #ifdef __powerpc64__
 512 /* _init and _fini functions are built from bits spread across many
 513    object files, each potentially with a different TOC pointer.  For
 514    that reason, place a nop after the call so that the linker can
 515    restore the TOC pointer if a TOC adjusting call stub is needed.  */
 516 #if DOT_SYMBOLS
 517 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 518   asm (SECTION_OP "\n"                                  \
 519 "       bl ." #FUNC "\n"                                \
 520 "       nop\n"                                          \
 521 "       .previous");
 522 #else
 523 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 524   asm (SECTION_OP "\n"                                  \
 525 "       bl " #FUNC "\n"                                 \
 526 "       nop\n"                                          \
 527 "       .previous");
 528 #endif
 529 #endif
 530
 531 /* FP save and restore routines.  */
 532 #undef  SAVE_FP_PREFIX
 533 #define SAVE_FP_PREFIX (TARGET_64BIT ? "._savef" : "_savefpr_")
 534 #undef  SAVE_FP_SUFFIX
 535 #define SAVE_FP_SUFFIX ""
 536 #undef  RESTORE_FP_PREFIX
 537 #define RESTORE_FP_PREFIX (TARGET_64BIT ? "._restf" : "_restfpr_")
 538 #undef  RESTORE_FP_SUFFIX
 539 #define RESTORE_FP_SUFFIX ""
 540
 541 /* Dwarf2 debugging.  */
 542 #undef  PREFERRED_DEBUGGING_TYPE
 543 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 544
 545 /* This is how to declare the size of a function.  */
 546 #undef  ASM_DECLARE_FUNCTION_SIZE
 547 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 548   do                                                                    \
 549     {                                                                   \
 550       if (!flag_inhibit_size_directive)                                 \
 551         {                                                               \
 552           fputs ("\t.size\t", (FILE));                                  \
 553           if (TARGET_64BIT && DOT_SYMBOLS)                              \
 554             putc ('.', (FILE));                                         \
 555           assemble_name ((FILE), (FNAME));                              \
 556           fputs (",.-", (FILE));                                        \
 557           rs6000_output_function_entry (FILE, FNAME);                   \
 558           putc ('\n', (FILE));                                          \
 559         }                                                               \
 560     }                                                                   \
 561   while (0)
 562
 563 /* Return nonzero if this entry is to be written into the constant
 564    pool in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF
 565    or a CONST containing one of them.  If -mfp-in-toc (the default),
 566    we also do this for floating-point constants.  We actually can only
 567    do this if the FP formats of the target and host machines are the
 568    same, but we can't check that since not every file that uses
 569    the macros includes real.h.  We also do this when we can write the
 570    entry into the TOC and the entry is not larger than a TOC entry.  */
 571
 572 #undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
 573 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
 574   (TARGET_TOC                                                           \
 575    && (GET_CODE (X) == SYMBOL_REF                                       \
 576        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
 577            && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)           \
 578        || GET_CODE (X) == LABEL_REF                                     \
 579        || (GET_CODE (X) == CONST_INT                                    \
 580            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
 581        || (GET_CODE (X) == CONST_DOUBLE                                 \
 582            && ((TARGET_64BIT                                            \
 583                 && (TARGET_MINIMAL_TOC                                  \
 584                     || (SCALAR_FLOAT_MODE_P (GET_MODE (X))              \
 585                         && ! TARGET_NO_FP_IN_TOC)))                     \
 586                || (!TARGET_64BIT                                        \
 587                    && !TARGET_NO_FP_IN_TOC                              \
 588                    && SCALAR_FLOAT_MODE_P (GET_MODE (X))                \
 589                    && BITS_PER_WORD == HOST_BITS_PER_INT)))))
 590
 591 /* Select a format to encode pointers in exception handling data.  CODE
 592    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
 593    true if the symbol may be affected by dynamic relocations.  */
 594 #undef  ASM_PREFERRED_EH_DATA_FORMAT
 595 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 596   (TARGET_64BIT || flag_pic                                             \
 597    ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel               \
 598       | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4))             \
 599    : DW_EH_PE_absptr)
 600
 601 /* For backward compatibility, we must continue to use the AIX
 602    structure return convention.  */
 603 #undef DRAFT_V4_STRUCT_RET
 604 #define DRAFT_V4_STRUCT_RET (!TARGET_64BIT)
 605
 606 #ifdef TARGET_LIBC_PROVIDES_SSP
 607 /* ppc32 glibc provides __stack_chk_guard in -0x7008(2),
 608    ppc64 glibc provides it at -0x7010(13).  */
 609 #define TARGET_THREAD_SSP_OFFSET        (TARGET_64BIT ? -0x7010 : -0x7008)
 610 #endif
 611
 612 #define POWERPC_LINUX
 613
 614 /* ppc{32,64} linux has 128-bit long double support in glibc 2.4 and later.  */
 615 #ifdef TARGET_DEFAULT_LONG_DOUBLE_128
 616 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
 617 #endif
 618
 619 /* Static stack checking is supported by means of probes.  */
 620 #define STACK_CHECK_STATIC_BUILTIN 1
 621
 622 /* The default value isn't sufficient in 64-bit mode.  */
 623 #define STACK_CHECK_PROTECT (TARGET_64BIT ? 16 * 1024 : 12 * 1024)
 624
 625 /* Software floating point support for exceptions and rounding modes
 626    depends on the C library in use.  */
 627 #undef TARGET_FLOAT_EXCEPTIONS_ROUNDING_SUPPORTED_P
 628 #define TARGET_FLOAT_EXCEPTIONS_ROUNDING_SUPPORTED_P \
 629   rs6000_linux_float_exceptions_rounding_supported_p
 630
 631 /* Support for TARGET_ATOMIC_ASSIGN_EXPAND_FENV without FPRs depends
 632    on glibc 2.19 or greater.  */
 633 #if TARGET_GLIBC_MAJOR > 2 \
 634   || (TARGET_GLIBC_MAJOR == 2 && TARGET_GLIBC_MINOR >= 19)
 635 #define RS6000_GLIBC_ATOMIC_FENV 1
 636 #endif
 637
 638 /* The IEEE 128-bit emulator is only built on Linux systems.  Flag that we
 639    should enable the type handling for KFmode on VSX systems even if we are not
 640    enabling the __float128 keyword.  */
 641 #undef  TARGET_FLOAT128_ENABLE_TYPE
 642 #define TARGET_FLOAT128_ENABLE_TYPE 1