gcc/config/rs6000/linux64.h

   1 /* Definitions of target machine for GNU compiler,
   2    for 64 bit PowerPC linux.
   3    Copyright (C) 2000-2018 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 #if TARGET_IEEEQUAD_DEFAULT
 249 #define MULTILIB_DEFAULTS_IEEE "mabi=ieeelongdouble"
 250
 251 #else  /* TARGET_IEEEQUAD_DEFAULT.  */
 252 #define MULTILIB_DEFAULTS_IEEE "mabi=ibmlongdouble"
 253 #endif /* TARGET_IEEEQUAD_DEFAULT.  */
 254
 255 #undef MULTILIB_DEFAULTS
 256 #if DEFAULT_ARCH64_P
 257 #define MULTILIB_DEFAULTS { "m64", MULTILIB_DEFAULTS_IEEE }
 258 #else
 259 #define MULTILIB_DEFAULTS { "m32", MULTILIB_DEFAULTS_IEEE }
 260 #endif
 261
 262 /* Split stack is only supported for 64 bit, and requires glibc >= 2.18.  */
 263 #if TARGET_GLIBC_MAJOR * 1000 + TARGET_GLIBC_MINOR >= 2018
 264 # ifndef RS6000_BI_ARCH
 265 #  define TARGET_CAN_SPLIT_STACK
 266 # else
 267 #  if DEFAULT_ARCH64_P
 268 /* Supported, and the default is -m64  */
 269 #   define TARGET_CAN_SPLIT_STACK_64BIT 1
 270 #  else
 271 /* Supported, and the default is -m32  */
 272 #   define TARGET_CAN_SPLIT_STACK_64BIT 0
 273 #  endif
 274 # endif
 275 #endif
 276
 277 #ifndef RS6000_BI_ARCH
 278
 279 /* 64-bit PowerPC Linux always has a TOC.  */
 280 #undef  TARGET_TOC
 281 #define TARGET_TOC              1
 282
 283 /* Some things from sysv4.h we don't do when 64 bit.  */
 284 #undef  OPTION_RELOCATABLE
 285 #define OPTION_RELOCATABLE      0
 286 #undef  OPTION_EABI
 287 #define OPTION_EABI             0
 288 #undef  OPTION_PROTOTYPE
 289 #define OPTION_PROTOTYPE        0
 290 #undef RELOCATABLE_NEEDS_FIXUP
 291 #define RELOCATABLE_NEEDS_FIXUP 0
 292
 293 #endif
 294
 295 /* We use glibc _mcount for profiling.  */
 296 #define NO_PROFILE_COUNTERS 1
 297 #define PROFILE_HOOK(LABEL) \
 298   do { if (TARGET_64BIT) output_profile_hook (LABEL); } while (0)
 299
 300 /* PowerPC64 Linux word-aligns FP doubles when -malign-power is given.  */
 301 #undef  ADJUST_FIELD_ALIGN
 302 #define ADJUST_FIELD_ALIGN(FIELD, TYPE, COMPUTED) \
 303   (rs6000_special_adjust_field_align_p ((TYPE), (COMPUTED))             \
 304    ? 128                                                                \
 305    : (TARGET_64BIT                                                      \
 306       && TARGET_ALIGN_NATURAL == 0                                      \
 307       && TYPE_MODE (strip_array_types (TYPE)) == DFmode)                \
 308    ? MIN ((COMPUTED), 32)                                               \
 309    : (COMPUTED))
 310
 311 /* PowerPC64 Linux increases natural record alignment to doubleword if
 312    the first field is an FP double, only if in power alignment mode.  */
 313 #undef  ROUND_TYPE_ALIGN
 314 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                   \
 315   ((TARGET_64BIT                                                        \
 316     && (TREE_CODE (STRUCT) == RECORD_TYPE                               \
 317         || TREE_CODE (STRUCT) == UNION_TYPE                             \
 318         || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                       \
 319     && TARGET_ALIGN_NATURAL == 0)                                       \
 320    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)      \
 321    : MAX ((COMPUTED), (SPECIFIED)))
 322
 323 /* Use the default for compiling target libs.  */
 324 #ifdef IN_TARGET_LIBS
 325 #undef TARGET_ALIGN_NATURAL
 326 #define TARGET_ALIGN_NATURAL 1
 327 #endif
 328
 329 /* Indicate that jump tables go in the text section.  */
 330 #undef  JUMP_TABLES_IN_TEXT_SECTION
 331 #define JUMP_TABLES_IN_TEXT_SECTION TARGET_64BIT
 332
 333 /* The linux ppc64 ABI isn't explicit on whether aggregates smaller
 334    than a doubleword should be padded upward or downward.  You could
 335    reasonably assume that they follow the normal rules for structure
 336    layout treating the parameter area as any other block of memory,
 337    then map the reg param area to registers.  i.e. pad upward.
 338    Setting both of the following defines results in this behavior.
 339    Setting just the first one will result in aggregates that fit in a
 340    doubleword being padded downward, and others being padded upward.
 341    Not a bad idea as this results in struct { int x; } being passed
 342    the same way as an int.  */
 343 #define AGGREGATE_PADDING_FIXED TARGET_64BIT
 344 #define AGGREGATES_PAD_UPWARD_ALWAYS 0
 345
 346 /* Specify padding for the last element of a block move between
 347    registers and memory.  FIRST is nonzero if this is the only
 348    element.  */
 349 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 350   (!(FIRST) ? PAD_UPWARD : targetm.calls.function_arg_padding (MODE, TYPE))
 351
 352 /* Linux doesn't support saving and restoring 64-bit regs in a 32-bit
 353    process.  */
 354 #define OS_MISSING_POWERPC64 !TARGET_64BIT
 355
 356 #ifdef SINGLE_LIBC
 357 #define OPTION_GLIBC  (DEFAULT_LIBC == LIBC_GLIBC)
 358 #define OPTION_UCLIBC (DEFAULT_LIBC == LIBC_UCLIBC)
 359 #define OPTION_BIONIC (DEFAULT_LIBC == LIBC_BIONIC)
 360 #undef OPTION_MUSL
 361 #define OPTION_MUSL   (DEFAULT_LIBC == LIBC_MUSL)
 362 #else
 363 #define OPTION_GLIBC  (linux_libc == LIBC_GLIBC)
 364 #define OPTION_UCLIBC (linux_libc == LIBC_UCLIBC)
 365 #define OPTION_BIONIC (linux_libc == LIBC_BIONIC)
 366 #undef OPTION_MUSL
 367 #define OPTION_MUSL   (linux_libc == LIBC_MUSL)
 368 #endif
 369
 370 /* Determine what functions are present at the runtime;
 371    this includes full c99 runtime and sincos.  */
 372 #undef TARGET_LIBC_HAS_FUNCTION
 373 #define TARGET_LIBC_HAS_FUNCTION linux_libc_has_function
 374
 375 #undef  TARGET_OS_CPP_BUILTINS
 376 #define TARGET_OS_CPP_BUILTINS()                        \
 377   do                                                    \
 378     {                                                   \
 379       if (TARGET_64BIT)                                 \
 380         {                                               \
 381           builtin_define ("__PPC__");                   \
 382           builtin_define ("__PPC64__");                 \
 383           builtin_define ("__powerpc__");               \
 384           builtin_define ("__powerpc64__");             \
 385           if (!DOT_SYMBOLS)                             \
 386             builtin_define ("_CALL_LINUX");             \
 387           builtin_assert ("cpu=powerpc64");             \
 388           builtin_assert ("machine=powerpc64");         \
 389         }                                               \
 390       else                                              \
 391         {                                               \
 392           builtin_define_std ("PPC");                   \
 393           builtin_define_std ("powerpc");               \
 394           builtin_assert ("cpu=powerpc");               \
 395           builtin_assert ("machine=powerpc");           \
 396           TARGET_OS_SYSV_CPP_BUILTINS ();               \
 397         }                                               \
 398     }                                                   \
 399   while (0)
 400
 401 #undef  CPP_OS_DEFAULT_SPEC
 402 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux) %(include_extra)"
 403
 404 #undef  LINK_SHLIB_SPEC
 405 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}} \
 406   %{static-pie:-static -pie --no-dynamic-linker -z text}"
 407
 408 #undef  LIB_DEFAULT_SPEC
 409 #define LIB_DEFAULT_SPEC "%(lib_linux)"
 410
 411 #undef  STARTFILE_DEFAULT_SPEC
 412 #define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
 413
 414 #undef  ENDFILE_DEFAULT_SPEC
 415 #define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
 416
 417 #undef  LINK_START_DEFAULT_SPEC
 418 #define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
 419
 420 #undef  LINK_OS_DEFAULT_SPEC
 421 #define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
 422
 423 #define GLIBC_DYNAMIC_LINKER32 "%(dynamic_linker_prefix)/lib/ld.so.1"
 424
 425 #ifdef LINUX64_DEFAULT_ABI_ELFv2
 426 #define GLIBC_DYNAMIC_LINKER64 \
 427 "%{mabi=elfv1:%(dynamic_linker_prefix)/lib64/ld64.so.1;" \
 428 ":%(dynamic_linker_prefix)/lib64/ld64.so.2}"
 429 #else
 430 #define GLIBC_DYNAMIC_LINKER64 \
 431 "%{mabi=elfv2:%(dynamic_linker_prefix)/lib64/ld64.so.2;" \
 432 ":%(dynamic_linker_prefix)/lib64/ld64.so.1}"
 433 #endif
 434
 435 #define MUSL_DYNAMIC_LINKER32 \
 436   "/lib/ld-musl-powerpc" MUSL_DYNAMIC_LINKER_E "%{msoft-float:-sf}.so.1"
 437 #define MUSL_DYNAMIC_LINKER64 \
 438   "/lib/ld-musl-powerpc64" MUSL_DYNAMIC_LINKER_E "%{msoft-float:-sf}.so.1"
 439
 440 #define UCLIBC_DYNAMIC_LINKER32 "/lib/ld-uClibc.so.0"
 441 #define UCLIBC_DYNAMIC_LINKER64 "/lib/ld64-uClibc.so.0"
 442 #if DEFAULT_LIBC == LIBC_UCLIBC
 443 #define CHOOSE_DYNAMIC_LINKER(G, U, M) \
 444   "%{mglibc:" G ";:%{mmusl:" M ";:" U "}}"
 445 #elif DEFAULT_LIBC == LIBC_GLIBC
 446 #define CHOOSE_DYNAMIC_LINKER(G, U, M) \
 447   "%{muclibc:" U ";:%{mmusl:" M ";:" G "}}"
 448 #elif DEFAULT_LIBC == LIBC_MUSL
 449 #define CHOOSE_DYNAMIC_LINKER(G, U, M) \
 450   "%{mglibc:" G ";:%{muclibc:" U ";:" M "}}"
 451 #else
 452 #error "Unsupported DEFAULT_LIBC"
 453 #endif
 454 #define GNU_USER_DYNAMIC_LINKER32 \
 455   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32, \
 456                          MUSL_DYNAMIC_LINKER32)
 457 #define GNU_USER_DYNAMIC_LINKER64 \
 458   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64, \
 459                          MUSL_DYNAMIC_LINKER64)
 460
 461 #undef  DEFAULT_ASM_ENDIAN
 462 #if (TARGET_DEFAULT & MASK_LITTLE_ENDIAN)
 463 #define DEFAULT_ASM_ENDIAN " -mlittle"
 464 #define LINK_OS_LINUX_EMUL32 ENDIAN_SELECT(" -m elf32ppclinux",         \
 465                                            " -m elf32lppclinux",        \
 466                                            " -m elf32lppclinux")
 467 #define LINK_OS_LINUX_EMUL64 ENDIAN_SELECT(" -m elf64ppc",              \
 468                                            " -m elf64lppc",             \
 469                                            " -m elf64lppc")
 470 #else
 471 #define DEFAULT_ASM_ENDIAN " -mbig"
 472 #define LINK_OS_LINUX_EMUL32 ENDIAN_SELECT(" -m elf32ppclinux",         \
 473                                            " -m elf32lppclinux",        \
 474                                            " -m elf32ppclinux")
 475 #define LINK_OS_LINUX_EMUL64 ENDIAN_SELECT(" -m elf64ppc",              \
 476                                            " -m elf64lppc",             \
 477                                            " -m elf64ppc")
 478 #endif
 479
 480 #define LINK_OS_LINUX_SPEC32 LINK_OS_LINUX_EMUL32 " %{!shared: %{!static: \
 481   %{!static-pie: \
 482     %{rdynamic:-export-dynamic} \
 483     -dynamic-linker " GNU_USER_DYNAMIC_LINKER32 "}}} \
 484   %(link_os_extra_spec32)"
 485
 486 #define LINK_OS_LINUX_SPEC64 LINK_OS_LINUX_EMUL64 " %{!shared: %{!static: \
 487   %{!static-pie: \
 488     %{rdynamic:-export-dynamic} \
 489     -dynamic-linker " GNU_USER_DYNAMIC_LINKER64 "}}} \
 490   %(link_os_extra_spec64)"
 491
 492 #undef  TOC_SECTION_ASM_OP
 493 #define TOC_SECTION_ASM_OP \
 494   (TARGET_64BIT                                         \
 495    ? "\t.section\t\".toc\",\"aw\""                      \
 496    : "\t.section\t\".got\",\"aw\"")
 497
 498 #undef  MINIMAL_TOC_SECTION_ASM_OP
 499 #define MINIMAL_TOC_SECTION_ASM_OP \
 500   (TARGET_64BIT                                         \
 501    ? "\t.section\t\".toc1\",\"aw\""                     \
 502    : (flag_pic                                          \
 503       ? "\t.section\t\".got2\",\"aw\""                  \
 504       : "\t.section\t\".got1\",\"aw\""))
 505
 506 /* Must be at least as big as our pointer type.  */
 507 #undef  SIZE_TYPE
 508 #define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int")
 509
 510 #undef  PTRDIFF_TYPE
 511 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
 512
 513 #undef  WCHAR_TYPE
 514 #define WCHAR_TYPE (TARGET_64BIT ? "int" : "long int")
 515 #undef  WCHAR_TYPE_SIZE
 516 #define WCHAR_TYPE_SIZE 32
 517
 518 #undef  RS6000_MCOUNT
 519 #define RS6000_MCOUNT "_mcount"
 520
 521 #ifdef __powerpc64__
 522 /* _init and _fini functions are built from bits spread across many
 523    object files, each potentially with a different TOC pointer.  For
 524    that reason, place a nop after the call so that the linker can
 525    restore the TOC pointer if a TOC adjusting call stub is needed.  */
 526 #if DOT_SYMBOLS
 527 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 528   asm (SECTION_OP "\n"                                  \
 529 "       bl ." #FUNC "\n"                                \
 530 "       nop\n"                                          \
 531 "       .previous");
 532 #else
 533 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 534   asm (SECTION_OP "\n"                                  \
 535 "       bl " #FUNC "\n"                                 \
 536 "       nop\n"                                          \
 537 "       .previous");
 538 #endif
 539 #endif
 540
 541 /* FP save and restore routines.  */
 542 #undef  SAVE_FP_PREFIX
 543 #define SAVE_FP_PREFIX (TARGET_64BIT ? "._savef" : "_savefpr_")
 544 #undef  SAVE_FP_SUFFIX
 545 #define SAVE_FP_SUFFIX ""
 546 #undef  RESTORE_FP_PREFIX
 547 #define RESTORE_FP_PREFIX (TARGET_64BIT ? "._restf" : "_restfpr_")
 548 #undef  RESTORE_FP_SUFFIX
 549 #define RESTORE_FP_SUFFIX ""
 550
 551 /* Dwarf2 debugging.  */
 552 #undef  PREFERRED_DEBUGGING_TYPE
 553 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 554
 555 /* This is how to declare the size of a function.  */
 556 #undef  ASM_DECLARE_FUNCTION_SIZE
 557 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 558   do                                                                    \
 559     {                                                                   \
 560       if (!flag_inhibit_size_directive)                                 \
 561         {                                                               \
 562           fputs ("\t.size\t", (FILE));                                  \
 563           if (TARGET_64BIT && DOT_SYMBOLS)                              \
 564             putc ('.', (FILE));                                         \
 565           assemble_name ((FILE), (FNAME));                              \
 566           fputs (",.-", (FILE));                                        \
 567           rs6000_output_function_entry (FILE, FNAME);                   \
 568           putc ('\n', (FILE));                                          \
 569         }                                                               \
 570     }                                                                   \
 571   while (0)
 572
 573 /* Return nonzero if this entry is to be written into the constant
 574    pool in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF
 575    or a CONST containing one of them.  If -mfp-in-toc (the default),
 576    we also do this for floating-point constants.  We actually can only
 577    do this if the FP formats of the target and host machines are the
 578    same, but we can't check that since not every file that uses
 579    the macros includes real.h.  We also do this when we can write the
 580    entry into the TOC and the entry is not larger than a TOC entry.  */
 581
 582 #undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
 583 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
 584   (TARGET_TOC                                                           \
 585    && (GET_CODE (X) == SYMBOL_REF                                       \
 586        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
 587            && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)           \
 588        || GET_CODE (X) == LABEL_REF                                     \
 589        || (GET_CODE (X) == CONST_INT                                    \
 590            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
 591        || (GET_CODE (X) == CONST_DOUBLE                                 \
 592            && ((TARGET_64BIT                                            \
 593                 && (TARGET_MINIMAL_TOC                                  \
 594                     || (SCALAR_FLOAT_MODE_P (GET_MODE (X))              \
 595                         && ! TARGET_NO_FP_IN_TOC)))                     \
 596                || (!TARGET_64BIT                                        \
 597                    && !TARGET_NO_FP_IN_TOC                              \
 598                    && SCALAR_FLOAT_MODE_P (GET_MODE (X))                \
 599                    && BITS_PER_WORD == HOST_BITS_PER_INT)))))
 600
 601 /* Select a format to encode pointers in exception handling data.  CODE
 602    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
 603    true if the symbol may be affected by dynamic relocations.  */
 604 #undef  ASM_PREFERRED_EH_DATA_FORMAT
 605 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 606   (TARGET_64BIT || flag_pic                                             \
 607    ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel               \
 608       | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4))             \
 609    : DW_EH_PE_absptr)
 610
 611 /* For backward compatibility, we must continue to use the AIX
 612    structure return convention.  */
 613 #undef DRAFT_V4_STRUCT_RET
 614 #define DRAFT_V4_STRUCT_RET (!TARGET_64BIT)
 615
 616 #ifdef TARGET_LIBC_PROVIDES_SSP
 617 /* ppc32 glibc provides __stack_chk_guard in -0x7008(2),
 618    ppc64 glibc provides it at -0x7010(13).  */
 619 #define TARGET_THREAD_SSP_OFFSET        (TARGET_64BIT ? -0x7010 : -0x7008)
 620 #endif
 621
 622 #define POWERPC_LINUX
 623
 624 /* ppc{32,64} linux has 128-bit long double support in glibc 2.4 and later.  */
 625 #ifdef TARGET_DEFAULT_LONG_DOUBLE_128
 626 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
 627 #endif
 628
 629 /* Static stack checking is supported by means of probes.  */
 630 #define STACK_CHECK_STATIC_BUILTIN 1
 631
 632 /* The default value isn't sufficient in 64-bit mode.  */
 633 #define STACK_CHECK_PROTECT (TARGET_64BIT ? 16 * 1024 : 12 * 1024)
 634
 635 /* Software floating point support for exceptions and rounding modes
 636    depends on the C library in use.  */
 637 #undef TARGET_FLOAT_EXCEPTIONS_ROUNDING_SUPPORTED_P
 638 #define TARGET_FLOAT_EXCEPTIONS_ROUNDING_SUPPORTED_P \
 639   rs6000_linux_float_exceptions_rounding_supported_p
 640
 641 /* Support for TARGET_ATOMIC_ASSIGN_EXPAND_FENV without FPRs depends
 642    on glibc 2.19 or greater.  */
 643 #if TARGET_GLIBC_MAJOR > 2 \
 644   || (TARGET_GLIBC_MAJOR == 2 && TARGET_GLIBC_MINOR >= 19)
 645 #define RS6000_GLIBC_ATOMIC_FENV 1
 646 #endif
 647
 648 /* The IEEE 128-bit emulator is only built on Linux systems.  Flag that we
 649    should enable the type handling for KFmode on VSX systems even if we are not
 650    enabling the __float128 keyword.  */
 651 #undef  TARGET_FLOAT128_ENABLE_TYPE
 652 #define TARGET_FLOAT128_ENABLE_TYPE 1