gcc/config/rs6000/linux64.h

   1 /* Definitions of target machine for GNU compiler,
   2    for 64 bit PowerPC linux.
   3    Copyright (C) 2000-2019 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           if (TARGET_PLTSEQ && DEFAULT_ABI != ABI_ELFv2)        \
 159             {                                                   \
 160               if (global_options_set.x_rs6000_pltseq)           \
 161                 warning (0, "%qs unsupported for this ABI",     \
 162                          "-mpltseq");                           \
 163               rs6000_pltseq = false;                            \
 164             }                                                   \
 165         }                                                       \
 166       else                                                      \
 167         {                                                       \
 168           if (!RS6000_BI_ARCH_P)                                \
 169             error (INVALID_32BIT, "32");                        \
 170           if (TARGET_PROFILE_KERNEL)                            \
 171             {                                                   \
 172               TARGET_PROFILE_KERNEL = 0;                        \
 173               error (INVALID_32BIT, "profile-kernel");          \
 174             }                                                   \
 175           if (global_options_set.x_rs6000_current_cmodel)       \
 176             {                                                   \
 177               SET_CMODEL (CMODEL_SMALL);                        \
 178               error (INVALID_32BIT, "cmodel");                  \
 179             }                                                   \
 180         }                                                       \
 181     }                                                           \
 182   while (0)
 183
 184 #undef  ASM_DEFAULT_SPEC
 185 #undef  ASM_SPEC
 186 #undef  LINK_OS_LINUX_SPEC
 187 #undef  LINK_SECURE_PLT_SPEC
 188
 189 #ifndef RS6000_BI_ARCH
 190 #define ASM_DEFAULT_SPEC "-mppc64"
 191 #define ASM_SPEC         "%(asm_spec64) %(asm_spec_common)"
 192 #define LINK_OS_LINUX_SPEC "%(link_os_linux_spec64)"
 193 #define LINK_SECURE_PLT_SPEC ""
 194 #else
 195 #if DEFAULT_ARCH64_P
 196 #define ASM_DEFAULT_SPEC "-mppc%{!m32:64}"
 197 #define ASM_SPEC         "%{m32:%(asm_spec32)}%{!m32:%(asm_spec64)} %(asm_spec_common)"
 198 #define LINK_OS_LINUX_SPEC "%{m32:%(link_os_linux_spec32)}%{!m32:%(link_os_linux_spec64)}"
 199 #define LINK_SECURE_PLT_SPEC "%{m32: " LINK_SECURE_PLT_DEFAULT_SPEC "}"
 200 #else
 201 #define ASM_DEFAULT_SPEC "-mppc%{m64:64}"
 202 #define ASM_SPEC         "%{!m64:%(asm_spec32)}%{m64:%(asm_spec64)} %(asm_spec_common)"
 203 #define LINK_OS_LINUX_SPEC "%{!m64:%(link_os_linux_spec32)}%{m64:%(link_os_linux_spec64)}"
 204 #define LINK_SECURE_PLT_SPEC "%{!m64: " LINK_SECURE_PLT_DEFAULT_SPEC "}"
 205 #endif
 206 #endif
 207
 208 #define ASM_SPEC32 "-a32 \
 209 %{mrelocatable} %{mrelocatable-lib} %{" FPIE_OR_FPIC_SPEC ":-K PIC} \
 210 %{memb|msdata=eabi: -memb}"
 211
 212 #define ASM_SPEC64 "-a64"
 213
 214 #define ASM_SPEC_COMMON "%(asm_cpu) \
 215 %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}}" \
 216   ENDIAN_SELECT(" -mbig", " -mlittle", DEFAULT_ASM_ENDIAN)
 217
 218 #undef  SUBSUBTARGET_EXTRA_SPECS
 219 #define SUBSUBTARGET_EXTRA_SPECS \
 220   { "asm_spec_common",          ASM_SPEC_COMMON },                      \
 221   { "asm_spec32",               ASM_SPEC32 },                           \
 222   { "asm_spec64",               ASM_SPEC64 },                           \
 223   { "link_os_linux_spec32",     LINK_OS_LINUX_SPEC32 },                 \
 224   { "link_os_linux_spec64",     LINK_OS_LINUX_SPEC64 },                 \
 225   { "link_os_extra_spec32",     LINK_OS_EXTRA_SPEC32 },                 \
 226   { "link_os_extra_spec64",     LINK_OS_EXTRA_SPEC64 },                 \
 227   { "link_os_new_dtags",        LINK_OS_NEW_DTAGS_SPEC },               \
 228   { "include_extra",            INCLUDE_EXTRA_SPEC },                   \
 229   { "dynamic_linker_prefix",    DYNAMIC_LINKER_PREFIX },
 230
 231 /* Optional specs used for overriding the system include directory, default
 232    -rpath links, and prefix for the dynamic linker.  Normally, there are not
 233    defined, but if the user configure with the --with-advance-toolchain=<xxx>
 234    option, the advance-toolchain.h file will override these.  */
 235 #ifndef INCLUDE_EXTRA_SPEC
 236 #define INCLUDE_EXTRA_SPEC      ""
 237 #endif
 238
 239 #ifndef LINK_OS_EXTRA_SPEC32
 240 #define LINK_OS_EXTRA_SPEC32    ""
 241 #endif
 242
 243 #ifndef LINK_OS_EXTRA_SPEC64
 244 #define LINK_OS_EXTRA_SPEC64    ""
 245 #endif
 246
 247 #ifndef LINK_OS_NEW_DTAGS_SPEC
 248 #define LINK_OS_NEW_DTAGS_SPEC  ""
 249 #endif
 250
 251 #ifndef DYNAMIC_LINKER_PREFIX
 252 #define DYNAMIC_LINKER_PREFIX   ""
 253 #endif
 254
 255 #undef  MULTILIB_DEFAULTS
 256 #if DEFAULT_ARCH64_P
 257 #define MULTILIB_DEFAULTS { "m64" }
 258 #else
 259 #define MULTILIB_DEFAULTS { "m32" }
 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 (strcmp (rs6000_abi_name, "linux") == 0)       \
 380         GNU_USER_TARGET_OS_CPP_BUILTINS();              \
 381       if (TARGET_64BIT)                                 \
 382         {                                               \
 383           builtin_define ("__PPC__");                   \
 384           builtin_define ("__PPC64__");                 \
 385           builtin_define ("__powerpc__");               \
 386           builtin_define ("__powerpc64__");             \
 387           if (!DOT_SYMBOLS)                             \
 388             builtin_define ("_CALL_LINUX");             \
 389           builtin_assert ("cpu=powerpc64");             \
 390           builtin_assert ("machine=powerpc64");         \
 391         }                                               \
 392       else                                              \
 393         {                                               \
 394           builtin_define_std ("PPC");                   \
 395           builtin_define_std ("powerpc");               \
 396           builtin_assert ("cpu=powerpc");               \
 397           builtin_assert ("machine=powerpc");           \
 398           TARGET_OS_SYSV_CPP_BUILTINS ();               \
 399         }                                               \
 400     }                                                   \
 401   while (0)
 402
 403 #define GNU_USER_TARGET_D_OS_VERSIONS()         \
 404     do {                                        \
 405         builtin_version ("linux");              \
 406         if (OPTION_GLIBC)                       \
 407           builtin_version ("CRuntime_Glibc");   \
 408         else if (OPTION_UCLIBC)                 \
 409           builtin_version ("CRuntime_UClibc");  \
 410         else if (OPTION_BIONIC)                 \
 411           builtin_version ("CRuntime_Bionic");  \
 412         else if (OPTION_MUSL)                   \
 413           builtin_version ("CRuntime_Musl");    \
 414     } while (0)
 415
 416 #undef  CPP_OS_DEFAULT_SPEC
 417 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux) %(include_extra)"
 418
 419 #undef  LINK_SHLIB_SPEC
 420 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}} \
 421   %{static-pie:-static -pie --no-dynamic-linker -z text}"
 422
 423 #undef  LIB_DEFAULT_SPEC
 424 #define LIB_DEFAULT_SPEC "%(lib_linux)"
 425
 426 #undef  STARTFILE_DEFAULT_SPEC
 427 #define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
 428
 429 #undef  ENDFILE_DEFAULT_SPEC
 430 #define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
 431
 432 #undef  LINK_START_DEFAULT_SPEC
 433 #define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
 434
 435 #undef  LINK_OS_DEFAULT_SPEC
 436 #define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
 437
 438 #define GLIBC_DYNAMIC_LINKER32 "%(dynamic_linker_prefix)/lib/ld.so.1"
 439
 440 #ifdef LINUX64_DEFAULT_ABI_ELFv2
 441 #define GLIBC_DYNAMIC_LINKER64 \
 442 "%{mabi=elfv1:%(dynamic_linker_prefix)/lib64/ld64.so.1;" \
 443 ":%(dynamic_linker_prefix)/lib64/ld64.so.2}"
 444 #else
 445 #define GLIBC_DYNAMIC_LINKER64 \
 446 "%{mabi=elfv2:%(dynamic_linker_prefix)/lib64/ld64.so.2;" \
 447 ":%(dynamic_linker_prefix)/lib64/ld64.so.1}"
 448 #endif
 449
 450 #undef MUSL_DYNAMIC_LINKER32
 451 #define MUSL_DYNAMIC_LINKER32 \
 452   "/lib/ld-musl-powerpc" MUSL_DYNAMIC_LINKER_E "%{msoft-float:-sf}.so.1"
 453 #undef MUSL_DYNAMIC_LINKER64
 454 #define MUSL_DYNAMIC_LINKER64 \
 455   "/lib/ld-musl-powerpc64" MUSL_DYNAMIC_LINKER_E "%{msoft-float:-sf}.so.1"
 456
 457 #undef  DEFAULT_ASM_ENDIAN
 458 #if (TARGET_DEFAULT & MASK_LITTLE_ENDIAN)
 459 #define DEFAULT_ASM_ENDIAN " -mlittle"
 460 #define LINK_OS_LINUX_EMUL32 ENDIAN_SELECT(" -m elf32ppclinux",         \
 461                                            " -m elf32lppclinux",        \
 462                                            " -m elf32lppclinux")
 463 #define LINK_OS_LINUX_EMUL64 ENDIAN_SELECT(" -m elf64ppc",              \
 464                                            " -m elf64lppc",             \
 465                                            " -m elf64lppc")
 466 #else
 467 #define DEFAULT_ASM_ENDIAN " -mbig"
 468 #define LINK_OS_LINUX_EMUL32 ENDIAN_SELECT(" -m elf32ppclinux",         \
 469                                            " -m elf32lppclinux",        \
 470                                            " -m elf32ppclinux")
 471 #define LINK_OS_LINUX_EMUL64 ENDIAN_SELECT(" -m elf64ppc",              \
 472                                            " -m elf64lppc",             \
 473                                            " -m elf64ppc")
 474 #endif
 475
 476 #define LINK_OS_LINUX_SPEC32 LINK_OS_LINUX_EMUL32 " %{!shared: %{!static: \
 477   %{!static-pie: \
 478     %{rdynamic:-export-dynamic} \
 479     -dynamic-linker " GNU_USER_DYNAMIC_LINKER32 "}}} \
 480   %(link_os_extra_spec32)"
 481
 482 #define LINK_OS_LINUX_SPEC64 LINK_OS_LINUX_EMUL64 " %{!shared: %{!static: \
 483   %{!static-pie: \
 484     %{rdynamic:-export-dynamic} \
 485     -dynamic-linker " GNU_USER_DYNAMIC_LINKER64 "}}} \
 486   %(link_os_extra_spec64)"
 487
 488 /* Use gnu-user.h LINK_GCC_SEQUENCE_SPEC for linux.  */
 489 #undef LINK_GCC_C_SEQUENCE_SPEC
 490 #define LINK_GCC_C_SEQUENCE_SPEC \
 491   "%{mads|myellowknife|mmvme|msim:%G %L %G;" \
 492   "!mcall-*|mcall-linux:" GNU_USER_TARGET_LINK_GCC_C_SEQUENCE_SPEC ";" \
 493   ":%G %L %G}"
 494
 495 #undef  TOC_SECTION_ASM_OP
 496 #define TOC_SECTION_ASM_OP \
 497   (TARGET_64BIT                                         \
 498    ? "\t.section\t\".toc\",\"aw\""                      \
 499    : "\t.section\t\".got\",\"aw\"")
 500
 501 #undef  MINIMAL_TOC_SECTION_ASM_OP
 502 #define MINIMAL_TOC_SECTION_ASM_OP \
 503   (TARGET_64BIT                                         \
 504    ? "\t.section\t\".toc1\",\"aw\""                     \
 505    : (flag_pic                                          \
 506       ? "\t.section\t\".got2\",\"aw\""                  \
 507       : "\t.section\t\".got1\",\"aw\""))
 508
 509 /* Must be at least as big as our pointer type.  */
 510 #undef  SIZE_TYPE
 511 #define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int")
 512
 513 #undef  PTRDIFF_TYPE
 514 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
 515
 516 #undef  WCHAR_TYPE
 517 #define WCHAR_TYPE (TARGET_64BIT ? "int" : "long int")
 518 #undef  WCHAR_TYPE_SIZE
 519 #define WCHAR_TYPE_SIZE 32
 520
 521 #undef  RS6000_MCOUNT
 522 #define RS6000_MCOUNT "_mcount"
 523
 524 #ifdef __powerpc64__
 525 /* _init and _fini functions are built from bits spread across many
 526    object files, each potentially with a different TOC pointer.  For
 527    that reason, place a nop after the call so that the linker can
 528    restore the TOC pointer if a TOC adjusting call stub is needed.  */
 529 #if DOT_SYMBOLS
 530 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 531   asm (SECTION_OP "\n"                                  \
 532 "       bl ." #FUNC "\n"                                \
 533 "       nop\n"                                          \
 534 "       .previous");
 535 #else
 536 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 537   asm (SECTION_OP "\n"                                  \
 538 "       bl " #FUNC "\n"                                 \
 539 "       nop\n"                                          \
 540 "       .previous");
 541 #endif
 542 #endif
 543
 544 /* FP save and restore routines.  */
 545 #undef  SAVE_FP_PREFIX
 546 #define SAVE_FP_PREFIX (TARGET_64BIT ? "._savef" : "_savefpr_")
 547 #undef  SAVE_FP_SUFFIX
 548 #define SAVE_FP_SUFFIX ""
 549 #undef  RESTORE_FP_PREFIX
 550 #define RESTORE_FP_PREFIX (TARGET_64BIT ? "._restf" : "_restfpr_")
 551 #undef  RESTORE_FP_SUFFIX
 552 #define RESTORE_FP_SUFFIX ""
 553
 554 /* Dwarf2 debugging.  */
 555 #undef  PREFERRED_DEBUGGING_TYPE
 556 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 557
 558 /* This is how to declare the size of a function.  */
 559 #undef  ASM_DECLARE_FUNCTION_SIZE
 560 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 561   do                                                                    \
 562     {                                                                   \
 563       if (!flag_inhibit_size_directive)                                 \
 564         {                                                               \
 565           fputs ("\t.size\t", (FILE));                                  \
 566           if (TARGET_64BIT && DOT_SYMBOLS)                              \
 567             putc ('.', (FILE));                                         \
 568           assemble_name ((FILE), (FNAME));                              \
 569           fputs (",.-", (FILE));                                        \
 570           rs6000_output_function_entry (FILE, FNAME);                   \
 571           putc ('\n', (FILE));                                          \
 572         }                                                               \
 573     }                                                                   \
 574   while (0)
 575
 576 /* Return nonzero if this entry is to be written into the constant
 577    pool in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF
 578    or a CONST containing one of them.  If -mfp-in-toc (the default),
 579    we also do this for floating-point constants.  We actually can only
 580    do this if the FP formats of the target and host machines are the
 581    same, but we can't check that since not every file that uses
 582    the macros includes real.h.  We also do this when we can write an
 583    integer into the TOC and the entry is not larger than a TOC entry,
 584    but not for -mcmodel=medium where we'll use a toc-relative load for
 585    constants outside the TOC.  */
 586
 587 #undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
 588 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
 589   (TARGET_TOC                                                           \
 590    && (SYMBOL_REF_P (X)                                                 \
 591        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
 592            && SYMBOL_REF_P (XEXP (XEXP (X, 0), 0)))                     \
 593        || GET_CODE (X) == LABEL_REF                                     \
 594        || (CONST_INT_P (X)                                              \
 595            && TARGET_CMODEL != CMODEL_MEDIUM                            \
 596            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
 597        || (CONST_DOUBLE_P (X)                                           \
 598            && ((TARGET_64BIT                                            \
 599                 && (TARGET_MINIMAL_TOC                                  \
 600                     || (SCALAR_FLOAT_MODE_P (GET_MODE (X))              \
 601                         && ! TARGET_NO_FP_IN_TOC)))                     \
 602                || (!TARGET_64BIT                                        \
 603                    && !TARGET_NO_FP_IN_TOC                              \
 604                    && SCALAR_FLOAT_MODE_P (GET_MODE (X))                \
 605                    && BITS_PER_WORD == HOST_BITS_PER_INT)))))
 606
 607 /* Select a format to encode pointers in exception handling data.  CODE
 608    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
 609    true if the symbol may be affected by dynamic relocations.  */
 610 #undef  ASM_PREFERRED_EH_DATA_FORMAT
 611 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 612   (TARGET_64BIT || flag_pic                                             \
 613    ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel               \
 614       | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4))             \
 615    : DW_EH_PE_absptr)
 616
 617 /* For backward compatibility, we must continue to use the AIX
 618    structure return convention.  */
 619 #undef DRAFT_V4_STRUCT_RET
 620 #define DRAFT_V4_STRUCT_RET (!TARGET_64BIT)
 621
 622 #ifdef TARGET_LIBC_PROVIDES_SSP
 623 /* ppc32 glibc provides __stack_chk_guard in -0x7008(2),
 624    ppc64 glibc provides it at -0x7010(13).  */
 625 #define TARGET_THREAD_SSP_OFFSET        (TARGET_64BIT ? -0x7010 : -0x7008)
 626 #endif
 627
 628 #define POWERPC_LINUX
 629
 630 /* ppc{32,64} linux has 128-bit long double support in glibc 2.4 and later.  */
 631 #ifdef TARGET_DEFAULT_LONG_DOUBLE_128
 632 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
 633 #endif
 634
 635 /* Static stack checking is supported by means of probes.  */
 636 #define STACK_CHECK_STATIC_BUILTIN 1
 637
 638 /* The default value isn't sufficient in 64-bit mode.  */
 639 #define STACK_CHECK_PROTECT (TARGET_64BIT ? 16 * 1024 : 12 * 1024)
 640
 641 /* Software floating point support for exceptions and rounding modes
 642    depends on the C library in use.  */
 643 #undef TARGET_FLOAT_EXCEPTIONS_ROUNDING_SUPPORTED_P
 644 #define TARGET_FLOAT_EXCEPTIONS_ROUNDING_SUPPORTED_P \
 645   rs6000_linux_float_exceptions_rounding_supported_p
 646
 647 /* Support for TARGET_ATOMIC_ASSIGN_EXPAND_FENV without FPRs depends
 648    on glibc 2.19 or greater.  */
 649 #if TARGET_GLIBC_MAJOR > 2 \
 650   || (TARGET_GLIBC_MAJOR == 2 && TARGET_GLIBC_MINOR >= 19)
 651 #define RS6000_GLIBC_ATOMIC_FENV 1
 652 #endif
 653
 654 /* The IEEE 128-bit emulator is only built on Linux systems.  Flag that we
 655    should enable the type handling for KFmode on VSX systems even if we are not
 656    enabling the __float128 keyword.  */
 657 #undef  TARGET_FLOAT128_ENABLE_TYPE
 658 #define TARGET_FLOAT128_ENABLE_TYPE 1