gcc/config/rs6000/linux64.h

   1 /* Definitions of target machine for GNU compiler,
   2    for 64 bit PowerPC linux.
   3    Copyright (C) 2000-2016 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 #undef  LINK_SECURE_PLT_SPEC
 178
 179 #ifndef RS6000_BI_ARCH
 180 #define ASM_DEFAULT_SPEC "-mppc64"
 181 #define ASM_SPEC         "%(asm_spec64) %(asm_spec_common)"
 182 #define LINK_OS_LINUX_SPEC "%(link_os_linux_spec64)"
 183 #define LINK_SECURE_PLT_SPEC ""
 184 #else
 185 #if DEFAULT_ARCH64_P
 186 #define ASM_DEFAULT_SPEC "-mppc%{!m32:64}"
 187 #define ASM_SPEC         "%{m32:%(asm_spec32)}%{!m32:%(asm_spec64)} %(asm_spec_common)"
 188 #define LINK_OS_LINUX_SPEC "%{m32:%(link_os_linux_spec32)}%{!m32:%(link_os_linux_spec64)}"
 189 #define LINK_SECURE_PLT_SPEC "%{m32: " LINK_SECURE_PLT_DEFAULT_SPEC "}"
 190 #else
 191 #define ASM_DEFAULT_SPEC "-mppc%{m64:64}"
 192 #define ASM_SPEC         "%{!m64:%(asm_spec32)}%{m64:%(asm_spec64)} %(asm_spec_common)"
 193 #define LINK_OS_LINUX_SPEC "%{!m64:%(link_os_linux_spec32)}%{m64:%(link_os_linux_spec64)}"
 194 #define LINK_SECURE_PLT_SPEC "%{!m64: " LINK_SECURE_PLT_DEFAULT_SPEC "}"
 195 #endif
 196 #endif
 197
 198 #define ASM_SPEC32 "-a32 \
 199 %{mrelocatable} %{mrelocatable-lib} %{" FPIE_OR_FPIC_SPEC ":-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   { "link_os_extra_spec32",     LINK_OS_EXTRA_SPEC32 },                 \
 216   { "link_os_extra_spec64",     LINK_OS_EXTRA_SPEC64 },                 \
 217   { "link_os_new_dtags",        LINK_OS_NEW_DTAGS_SPEC },               \
 218   { "include_extra",            INCLUDE_EXTRA_SPEC },                   \
 219   { "dynamic_linker_prefix",    DYNAMIC_LINKER_PREFIX },
 220
 221 /* Optional specs used for overriding the system include directory, default
 222    -rpath links, and prefix for the dynamic linker.  Normally, there are not
 223    defined, but if the user configure with the --with-advance-toolchain=<xxx>
 224    option, the advance-toolchain.h file will override these.  */
 225 #ifndef INCLUDE_EXTRA_SPEC
 226 #define INCLUDE_EXTRA_SPEC      ""
 227 #endif
 228
 229 #ifndef LINK_OS_EXTRA_SPEC32
 230 #define LINK_OS_EXTRA_SPEC32    ""
 231 #endif
 232
 233 #ifndef LINK_OS_EXTRA_SPEC64
 234 #define LINK_OS_EXTRA_SPEC64    ""
 235 #endif
 236
 237 #ifndef LINK_OS_NEW_DTAGS_SPEC
 238 #define LINK_OS_NEW_DTAGS_SPEC  ""
 239 #endif
 240
 241 #ifndef DYNAMIC_LINKER_PREFIX
 242 #define DYNAMIC_LINKER_PREFIX   ""
 243 #endif
 244
 245 #undef  MULTILIB_DEFAULTS
 246 #if DEFAULT_ARCH64_P
 247 #define MULTILIB_DEFAULTS { "m64" }
 248 #else
 249 #define MULTILIB_DEFAULTS { "m32" }
 250 #endif
 251
 252 /* Split stack is only supported for 64 bit, and requires glibc >= 2.18.  */
 253 #if TARGET_GLIBC_MAJOR * 1000 + TARGET_GLIBC_MINOR >= 2018
 254 # ifndef RS6000_BI_ARCH
 255 #  define TARGET_CAN_SPLIT_STACK
 256 # else
 257 #  if DEFAULT_ARCH64_P
 258 /* Supported, and the default is -m64  */
 259 #   define TARGET_CAN_SPLIT_STACK_64BIT 1
 260 #  else
 261 /* Supported, and the default is -m32  */
 262 #   define TARGET_CAN_SPLIT_STACK_64BIT 0
 263 #  endif
 264 # endif
 265 #endif
 266
 267 #ifndef RS6000_BI_ARCH
 268
 269 /* 64-bit PowerPC Linux always has a TOC.  */
 270 #undef  TARGET_TOC
 271 #define TARGET_TOC              1
 272
 273 /* Some things from sysv4.h we don't do when 64 bit.  */
 274 #undef  OPTION_RELOCATABLE
 275 #define OPTION_RELOCATABLE      0
 276 #undef  OPTION_EABI
 277 #define OPTION_EABI             0
 278 #undef  OPTION_PROTOTYPE
 279 #define OPTION_PROTOTYPE        0
 280 #undef RELOCATABLE_NEEDS_FIXUP
 281 #define RELOCATABLE_NEEDS_FIXUP 0
 282
 283 #endif
 284
 285 /* We use glibc _mcount for profiling.  */
 286 #define NO_PROFILE_COUNTERS 1
 287 #define PROFILE_HOOK(LABEL) \
 288   do { if (TARGET_64BIT) output_profile_hook (LABEL); } while (0)
 289
 290 /* PowerPC64 Linux word-aligns FP doubles when -malign-power is given.  */
 291 #undef  ADJUST_FIELD_ALIGN
 292 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
 293   (rs6000_special_adjust_field_align_p ((FIELD), (COMPUTED))            \
 294    ? 128                                                                \
 295    : (TARGET_64BIT                                                      \
 296       && TARGET_ALIGN_NATURAL == 0                                      \
 297       && TYPE_MODE (strip_array_types (TREE_TYPE (FIELD))) == DFmode)   \
 298    ? MIN ((COMPUTED), 32)                                               \
 299    : (COMPUTED))
 300
 301 /* PowerPC64 Linux increases natural record alignment to doubleword if
 302    the first field is an FP double, only if in power alignment mode.  */
 303 #undef  ROUND_TYPE_ALIGN
 304 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                   \
 305   ((TARGET_64BIT                                                        \
 306     && (TREE_CODE (STRUCT) == RECORD_TYPE                               \
 307         || TREE_CODE (STRUCT) == UNION_TYPE                             \
 308         || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                       \
 309     && TARGET_ALIGN_NATURAL == 0)                                       \
 310    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)      \
 311    : MAX ((COMPUTED), (SPECIFIED)))
 312
 313 /* Use the default for compiling target libs.  */
 314 #ifdef IN_TARGET_LIBS
 315 #undef TARGET_ALIGN_NATURAL
 316 #define TARGET_ALIGN_NATURAL 1
 317 #endif
 318
 319 /* Indicate that jump tables go in the text section.  */
 320 #undef  JUMP_TABLES_IN_TEXT_SECTION
 321 #define JUMP_TABLES_IN_TEXT_SECTION TARGET_64BIT
 322
 323 /* The linux ppc64 ABI isn't explicit on whether aggregates smaller
 324    than a doubleword should be padded upward or downward.  You could
 325    reasonably assume that they follow the normal rules for structure
 326    layout treating the parameter area as any other block of memory,
 327    then map the reg param area to registers.  i.e. pad upward.
 328    Setting both of the following defines results in this behavior.
 329    Setting just the first one will result in aggregates that fit in a
 330    doubleword being padded downward, and others being padded upward.
 331    Not a bad idea as this results in struct { int x; } being passed
 332    the same way as an int.  */
 333 #define AGGREGATE_PADDING_FIXED TARGET_64BIT
 334 #define AGGREGATES_PAD_UPWARD_ALWAYS 0
 335
 336 /* Specify padding for the last element of a block move between
 337    registers and memory.  FIRST is nonzero if this is the only
 338    element.  */
 339 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 340   (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
 341
 342 /* Linux doesn't support saving and restoring 64-bit regs in a 32-bit
 343    process.  */
 344 #define OS_MISSING_POWERPC64 !TARGET_64BIT
 345
 346 #ifdef SINGLE_LIBC
 347 #define OPTION_GLIBC  (DEFAULT_LIBC == LIBC_GLIBC)
 348 #define OPTION_UCLIBC (DEFAULT_LIBC == LIBC_UCLIBC)
 349 #define OPTION_BIONIC (DEFAULT_LIBC == LIBC_BIONIC)
 350 #undef OPTION_MUSL
 351 #define OPTION_MUSL   (DEFAULT_LIBC == LIBC_MUSL)
 352 #else
 353 #define OPTION_GLIBC  (linux_libc == LIBC_GLIBC)
 354 #define OPTION_UCLIBC (linux_libc == LIBC_UCLIBC)
 355 #define OPTION_BIONIC (linux_libc == LIBC_BIONIC)
 356 #undef OPTION_MUSL
 357 #define OPTION_MUSL   (linux_libc == LIBC_MUSL)
 358 #endif
 359
 360 /* Determine what functions are present at the runtime;
 361    this includes full c99 runtime and sincos.  */
 362 #undef TARGET_LIBC_HAS_FUNCTION
 363 #define TARGET_LIBC_HAS_FUNCTION linux_libc_has_function
 364
 365 #undef  TARGET_OS_CPP_BUILTINS
 366 #define TARGET_OS_CPP_BUILTINS()                        \
 367   do                                                    \
 368     {                                                   \
 369       if (TARGET_64BIT)                                 \
 370         {                                               \
 371           builtin_define ("__PPC__");                   \
 372           builtin_define ("__PPC64__");                 \
 373           builtin_define ("__powerpc__");               \
 374           builtin_define ("__powerpc64__");             \
 375           if (!DOT_SYMBOLS)                             \
 376             builtin_define ("_CALL_LINUX");             \
 377           builtin_assert ("cpu=powerpc64");             \
 378           builtin_assert ("machine=powerpc64");         \
 379         }                                               \
 380       else                                              \
 381         {                                               \
 382           builtin_define_std ("PPC");                   \
 383           builtin_define_std ("powerpc");               \
 384           builtin_assert ("cpu=powerpc");               \
 385           builtin_assert ("machine=powerpc");           \
 386           TARGET_OS_SYSV_CPP_BUILTINS ();               \
 387         }                                               \
 388     }                                                   \
 389   while (0)
 390
 391 #undef  CPP_OS_DEFAULT_SPEC
 392 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux) %(include_extra)"
 393
 394 #undef  LINK_SHLIB_SPEC
 395 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
 396
 397 #undef  LIB_DEFAULT_SPEC
 398 #define LIB_DEFAULT_SPEC "%(lib_linux)"
 399
 400 #undef  STARTFILE_DEFAULT_SPEC
 401 #define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
 402
 403 #undef  ENDFILE_DEFAULT_SPEC
 404 #define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
 405
 406 #undef  LINK_START_DEFAULT_SPEC
 407 #define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
 408
 409 #undef  LINK_OS_DEFAULT_SPEC
 410 #define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
 411
 412 #define GLIBC_DYNAMIC_LINKER32 "%(dynamic_linker_prefix)/lib/ld.so.1"
 413
 414 #ifdef LINUX64_DEFAULT_ABI_ELFv2
 415 #define GLIBC_DYNAMIC_LINKER64 \
 416 "%{mabi=elfv1:%(dynamic_linker_prefix)/lib64/ld64.so.1;" \
 417 ":%(dynamic_linker_prefix)/lib64/ld64.so.2}"
 418 #else
 419 #define GLIBC_DYNAMIC_LINKER64 \
 420 "%{mabi=elfv2:%(dynamic_linker_prefix)/lib64/ld64.so.2;" \
 421 ":%(dynamic_linker_prefix)/lib64/ld64.so.1}"
 422 #endif
 423
 424 #define MUSL_DYNAMIC_LINKER32 \
 425   "/lib/ld-musl-powerpc" MUSL_DYNAMIC_LINKER_E "%{msoft-float:-sf}.so.1"
 426 #define MUSL_DYNAMIC_LINKER64 \
 427   "/lib/ld-musl-powerpc64" MUSL_DYNAMIC_LINKER_E "%{msoft-float:-sf}.so.1"
 428
 429 #define UCLIBC_DYNAMIC_LINKER32 "/lib/ld-uClibc.so.0"
 430 #define UCLIBC_DYNAMIC_LINKER64 "/lib/ld64-uClibc.so.0"
 431 #if DEFAULT_LIBC == LIBC_UCLIBC
 432 #define CHOOSE_DYNAMIC_LINKER(G, U, M) \
 433   "%{mglibc:" G ";:%{mmusl:" M ";:" U "}}"
 434 #elif DEFAULT_LIBC == LIBC_GLIBC
 435 #define CHOOSE_DYNAMIC_LINKER(G, U, M) \
 436   "%{muclibc:" U ";:%{mmusl:" M ";:" G "}}"
 437 #elif DEFAULT_LIBC == LIBC_MUSL
 438 #define CHOOSE_DYNAMIC_LINKER(G, U, M) \
 439   "%{mglibc:" G ";:%{muclibc:" U ";:" M "}}"
 440 #else
 441 #error "Unsupported DEFAULT_LIBC"
 442 #endif
 443 #define GNU_USER_DYNAMIC_LINKER32 \
 444   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32, \
 445                          MUSL_DYNAMIC_LINKER32)
 446 #define GNU_USER_DYNAMIC_LINKER64 \
 447   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64, \
 448                          MUSL_DYNAMIC_LINKER64)
 449
 450 #undef  DEFAULT_ASM_ENDIAN
 451 #if (TARGET_DEFAULT & MASK_LITTLE_ENDIAN)
 452 #define DEFAULT_ASM_ENDIAN " -mlittle"
 453 #define LINK_OS_LINUX_EMUL32 ENDIAN_SELECT(" -m elf32ppclinux",         \
 454                                            " -m elf32lppclinux",        \
 455                                            " -m elf32lppclinux")
 456 #define LINK_OS_LINUX_EMUL64 ENDIAN_SELECT(" -m elf64ppc",              \
 457                                            " -m elf64lppc",             \
 458                                            " -m elf64lppc")
 459 #else
 460 #define DEFAULT_ASM_ENDIAN " -mbig"
 461 #define LINK_OS_LINUX_EMUL32 ENDIAN_SELECT(" -m elf32ppclinux",         \
 462                                            " -m elf32lppclinux",        \
 463                                            " -m elf32ppclinux")
 464 #define LINK_OS_LINUX_EMUL64 ENDIAN_SELECT(" -m elf64ppc",              \
 465                                            " -m elf64lppc",             \
 466                                            " -m elf64ppc")
 467 #endif
 468
 469 #define LINK_OS_LINUX_SPEC32 LINK_OS_LINUX_EMUL32 " %{!shared: %{!static: \
 470   %{rdynamic:-export-dynamic} \
 471   -dynamic-linker " GNU_USER_DYNAMIC_LINKER32 "}} \
 472   %(link_os_extra_spec32)"
 473
 474 #define LINK_OS_LINUX_SPEC64 LINK_OS_LINUX_EMUL64 " %{!shared: %{!static: \
 475   %{rdynamic:-export-dynamic} \
 476   -dynamic-linker " GNU_USER_DYNAMIC_LINKER64 "}} \
 477   %(link_os_extra_spec64)"
 478
 479 #undef  TOC_SECTION_ASM_OP
 480 #define TOC_SECTION_ASM_OP \
 481   (TARGET_64BIT                                         \
 482    ? "\t.section\t\".toc\",\"aw\""                      \
 483    : "\t.section\t\".got\",\"aw\"")
 484
 485 #undef  MINIMAL_TOC_SECTION_ASM_OP
 486 #define MINIMAL_TOC_SECTION_ASM_OP \
 487   (TARGET_64BIT                                         \
 488    ? "\t.section\t\".toc1\",\"aw\""                     \
 489    : ((TARGET_RELOCATABLE || flag_pic)                  \
 490       ? "\t.section\t\".got2\",\"aw\""                  \
 491       : "\t.section\t\".got1\",\"aw\""))
 492
 493 /* Must be at least as big as our pointer type.  */
 494 #undef  SIZE_TYPE
 495 #define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int")
 496
 497 #undef  PTRDIFF_TYPE
 498 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
 499
 500 #undef  WCHAR_TYPE
 501 #define WCHAR_TYPE (TARGET_64BIT ? "int" : "long int")
 502 #undef  WCHAR_TYPE_SIZE
 503 #define WCHAR_TYPE_SIZE 32
 504
 505 #undef  RS6000_MCOUNT
 506 #define RS6000_MCOUNT "_mcount"
 507
 508 #ifdef __powerpc64__
 509 /* _init and _fini functions are built from bits spread across many
 510    object files, each potentially with a different TOC pointer.  For
 511    that reason, place a nop after the call so that the linker can
 512    restore the TOC pointer if a TOC adjusting call stub is needed.  */
 513 #if DOT_SYMBOLS
 514 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 515   asm (SECTION_OP "\n"                                  \
 516 "       bl ." #FUNC "\n"                                \
 517 "       nop\n"                                          \
 518 "       .previous");
 519 #else
 520 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 521   asm (SECTION_OP "\n"                                  \
 522 "       bl " #FUNC "\n"                                 \
 523 "       nop\n"                                          \
 524 "       .previous");
 525 #endif
 526 #endif
 527
 528 /* FP save and restore routines.  */
 529 #undef  SAVE_FP_PREFIX
 530 #define SAVE_FP_PREFIX (TARGET_64BIT ? "._savef" : "_savefpr_")
 531 #undef  SAVE_FP_SUFFIX
 532 #define SAVE_FP_SUFFIX ""
 533 #undef  RESTORE_FP_PREFIX
 534 #define RESTORE_FP_PREFIX (TARGET_64BIT ? "._restf" : "_restfpr_")
 535 #undef  RESTORE_FP_SUFFIX
 536 #define RESTORE_FP_SUFFIX ""
 537
 538 /* Dwarf2 debugging.  */
 539 #undef  PREFERRED_DEBUGGING_TYPE
 540 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 541
 542 /* This is how to declare the size of a function.  */
 543 #undef  ASM_DECLARE_FUNCTION_SIZE
 544 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 545   do                                                                    \
 546     {                                                                   \
 547       if (!flag_inhibit_size_directive)                                 \
 548         {                                                               \
 549           fputs ("\t.size\t", (FILE));                                  \
 550           if (TARGET_64BIT && DOT_SYMBOLS)                              \
 551             putc ('.', (FILE));                                         \
 552           assemble_name ((FILE), (FNAME));                              \
 553           fputs (",.-", (FILE));                                        \
 554           rs6000_output_function_entry (FILE, FNAME);                   \
 555           putc ('\n', (FILE));                                          \
 556         }                                                               \
 557     }                                                                   \
 558   while (0)
 559
 560 /* Return nonzero if this entry is to be written into the constant
 561    pool in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF
 562    or a CONST containing one of them.  If -mfp-in-toc (the default),
 563    we also do this for floating-point constants.  We actually can only
 564    do this if the FP formats of the target and host machines are the
 565    same, but we can't check that since not every file that uses
 566    the macros includes real.h.  We also do this when we can write the
 567    entry into the TOC and the entry is not larger than a TOC entry.  */
 568
 569 #undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
 570 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
 571   (TARGET_TOC                                                           \
 572    && (GET_CODE (X) == SYMBOL_REF                                       \
 573        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
 574            && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)           \
 575        || GET_CODE (X) == LABEL_REF                                     \
 576        || (GET_CODE (X) == CONST_INT                                    \
 577            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
 578        || (GET_CODE (X) == CONST_DOUBLE                                 \
 579            && ((TARGET_64BIT                                            \
 580                 && (TARGET_MINIMAL_TOC                                  \
 581                     || (SCALAR_FLOAT_MODE_P (GET_MODE (X))              \
 582                         && ! TARGET_NO_FP_IN_TOC)))                     \
 583                || (!TARGET_64BIT                                        \
 584                    && !TARGET_NO_FP_IN_TOC                              \
 585                    && !TARGET_RELOCATABLE                               \
 586                    && SCALAR_FLOAT_MODE_P (GET_MODE (X))                \
 587                    && BITS_PER_WORD == HOST_BITS_PER_INT)))))
 588
 589 /* Select a format to encode pointers in exception handling data.  CODE
 590    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
 591    true if the symbol may be affected by dynamic relocations.  */
 592 #undef  ASM_PREFERRED_EH_DATA_FORMAT
 593 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 594   ((TARGET_64BIT || flag_pic || TARGET_RELOCATABLE)                     \
 595    ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel               \
 596       | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4))             \
 597    : DW_EH_PE_absptr)
 598
 599 /* For backward compatibility, we must continue to use the AIX
 600    structure return convention.  */
 601 #undef DRAFT_V4_STRUCT_RET
 602 #define DRAFT_V4_STRUCT_RET (!TARGET_64BIT)
 603
 604 #ifdef TARGET_LIBC_PROVIDES_SSP
 605 /* ppc32 glibc provides __stack_chk_guard in -0x7008(2),
 606    ppc64 glibc provides it at -0x7010(13).  */
 607 #define TARGET_THREAD_SSP_OFFSET        (TARGET_64BIT ? -0x7010 : -0x7008)
 608 #endif
 609
 610 #define POWERPC_LINUX
 611
 612 /* ppc{32,64} linux has 128-bit long double support in glibc 2.4 and later.  */
 613 #ifdef TARGET_DEFAULT_LONG_DOUBLE_128
 614 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
 615 #endif
 616
 617 /* Static stack checking is supported by means of probes.  */
 618 #define STACK_CHECK_STATIC_BUILTIN 1
 619
 620 /* The default value isn't sufficient in 64-bit mode.  */
 621 #define STACK_CHECK_PROTECT (TARGET_64BIT ? 16 * 1024 : 12 * 1024)
 622
 623 /* Software floating point support for exceptions and rounding modes
 624    depends on the C library in use.  */
 625 #undef TARGET_FLOAT_EXCEPTIONS_ROUNDING_SUPPORTED_P
 626 #define TARGET_FLOAT_EXCEPTIONS_ROUNDING_SUPPORTED_P \
 627   rs6000_linux_float_exceptions_rounding_supported_p
 628
 629 /* Support for TARGET_ATOMIC_ASSIGN_EXPAND_FENV without FPRs depends
 630    on glibc 2.19 or greater.  */
 631 #if TARGET_GLIBC_MAJOR > 2 \
 632   || (TARGET_GLIBC_MAJOR == 2 && TARGET_GLIBC_MINOR >= 19)
 633 #define RS6000_GLIBC_ATOMIC_FENV 1
 634 #endif