gcc/config/rs6000/linux64.h

   1 /* Definitions of target machine for GNU compiler,
   2    for 64 bit PowerPC linux.
   3    Copyright (C) 2000-2024 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 rs6000_linux64_override_options (); while (0)
 100
 101 #undef  ASM_SPEC
 102 #undef  LINK_OS_LINUX_SPEC
 103 #undef  LINK_SECURE_PLT_SPEC
 104
 105 #ifndef RS6000_BI_ARCH
 106 #define ASM_SPEC         "%(asm_spec64) %(asm_spec_common)"
 107 #define LINK_OS_LINUX_SPEC "%(link_os_linux_spec64)"
 108 #define LINK_SECURE_PLT_SPEC ""
 109 #else
 110 #if DEFAULT_ARCH64_P
 111 #define ASM_SPEC         "%{m32:%(asm_spec32)}%{!m32:%(asm_spec64)} %(asm_spec_common)"
 112 #define LINK_OS_LINUX_SPEC "%{m32:%(link_os_linux_spec32)}%{!m32:%(link_os_linux_spec64)}"
 113 #define LINK_SECURE_PLT_SPEC "%{m32: " LINK_SECURE_PLT_DEFAULT_SPEC "}"
 114 #else
 115 #define ASM_SPEC         "%{!m64:%(asm_spec32)}%{m64:%(asm_spec64)} %(asm_spec_common)"
 116 #define LINK_OS_LINUX_SPEC "%{!m64:%(link_os_linux_spec32)}%{m64:%(link_os_linux_spec64)}"
 117 #define LINK_SECURE_PLT_SPEC "%{!m64: " LINK_SECURE_PLT_DEFAULT_SPEC "}"
 118 #endif
 119 #endif
 120
 121 #define ASM_SPEC32 "-a32 \
 122 %{mrelocatable} %{mrelocatable-lib} %{" FPIE_OR_FPIC_SPEC ":-K PIC} \
 123 %{memb|msdata=eabi: -memb}"
 124
 125 #define ASM_SPEC64 "-a64"
 126
 127 #define ASM_SPEC_COMMON "%(asm_cpu) \
 128 %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}}" \
 129   ENDIAN_SELECT(" -mbig", " -mlittle", DEFAULT_ASM_ENDIAN)
 130
 131 #undef  SUBSUBTARGET_EXTRA_SPECS
 132 #define SUBSUBTARGET_EXTRA_SPECS \
 133   { "asm_spec_common",          ASM_SPEC_COMMON },                      \
 134   { "asm_spec32",               ASM_SPEC32 },                           \
 135   { "asm_spec64",               ASM_SPEC64 },                           \
 136   { "link_os_linux_spec32",     LINK_OS_LINUX_SPEC32 },                 \
 137   { "link_os_linux_spec64",     LINK_OS_LINUX_SPEC64 },                 \
 138   { "link_os_extra_spec32",     LINK_OS_EXTRA_SPEC32 },                 \
 139   { "link_os_extra_spec64",     LINK_OS_EXTRA_SPEC64 },                 \
 140   { "link_os_new_dtags",        LINK_OS_NEW_DTAGS_SPEC },               \
 141   { "include_extra",            INCLUDE_EXTRA_SPEC },                   \
 142   { "dynamic_linker_prefix",    DYNAMIC_LINKER_PREFIX },
 143
 144 /* Optional specs used for overriding the system include directory, default
 145    -rpath links, and prefix for the dynamic linker.  Normally, there are not
 146    defined, but if the user configure with the --with-advance-toolchain=<xxx>
 147    option, the advance-toolchain.h file will override these.  */
 148 #ifndef INCLUDE_EXTRA_SPEC
 149 #define INCLUDE_EXTRA_SPEC      ""
 150 #endif
 151
 152 #ifndef LINK_OS_EXTRA_SPEC32
 153 #define LINK_OS_EXTRA_SPEC32    ""
 154 #endif
 155
 156 #ifndef LINK_OS_EXTRA_SPEC64
 157 #define LINK_OS_EXTRA_SPEC64    ""
 158 #endif
 159
 160 #ifndef LINK_OS_NEW_DTAGS_SPEC
 161 #define LINK_OS_NEW_DTAGS_SPEC  ""
 162 #endif
 163
 164 #ifndef DYNAMIC_LINKER_PREFIX
 165 #define DYNAMIC_LINKER_PREFIX   ""
 166 #endif
 167
 168 #undef  MULTILIB_DEFAULTS
 169 #if DEFAULT_ARCH64_P
 170 #define MULTILIB_DEFAULTS { "m64" }
 171 #else
 172 #define MULTILIB_DEFAULTS { "m32" }
 173 #endif
 174
 175 /* Split stack is only supported for 64 bit, and requires glibc >= 2.18.  */
 176 #if TARGET_GLIBC_MAJOR * 1000 + TARGET_GLIBC_MINOR >= 2018
 177 # ifndef RS6000_BI_ARCH
 178 #  define TARGET_CAN_SPLIT_STACK
 179 # else
 180 #  if DEFAULT_ARCH64_P
 181 /* Supported, and the default is -m64  */
 182 #   define TARGET_CAN_SPLIT_STACK_64BIT 1
 183 #  else
 184 /* Supported, and the default is -m32  */
 185 #   define TARGET_CAN_SPLIT_STACK_64BIT 0
 186 #  endif
 187 # endif
 188 #endif
 189
 190 #ifndef RS6000_BI_ARCH
 191
 192 /* 64-bit PowerPC Linux always has a TOC.  */
 193 #undef  TARGET_HAS_TOC
 194 #define TARGET_HAS_TOC          1
 195
 196 /* Some things from sysv4.h we don't do when 64 bit.  */
 197 #undef  OPTION_RELOCATABLE
 198 #define OPTION_RELOCATABLE      0
 199 #undef  OPTION_EABI
 200 #define OPTION_EABI             0
 201 #undef  OPTION_PROTOTYPE
 202 #define OPTION_PROTOTYPE        0
 203 #undef RELOCATABLE_NEEDS_FIXUP
 204 #define RELOCATABLE_NEEDS_FIXUP 0
 205
 206 #endif
 207
 208 /* We use glibc _mcount for profiling.  */
 209 #define NO_PROFILE_COUNTERS 1
 210 #define PROFILE_HOOK(LABEL) \
 211   do { if (TARGET_64BIT) output_profile_hook (LABEL); } while (0)
 212
 213 /* PowerPC64 Linux word-aligns FP doubles when -malign-power is given.  */
 214 #undef  ADJUST_FIELD_ALIGN
 215 #define ADJUST_FIELD_ALIGN(FIELD, TYPE, COMPUTED) \
 216   ((TARGET_64BIT                                                        \
 217     && TARGET_ALIGN_NATURAL == 0                                        \
 218     && TYPE_MODE (strip_array_types (TYPE)) == DFmode)                  \
 219    ? MIN ((COMPUTED), 32)                                               \
 220    : (COMPUTED))
 221
 222 /* PowerPC64 Linux increases natural record alignment to doubleword if
 223    the first field is an FP double, only if in power alignment mode.  */
 224 #undef  ROUND_TYPE_ALIGN
 225 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                   \
 226   ((TARGET_64BIT                                                        \
 227     && RECORD_OR_UNION_TYPE_P (STRUCT)                  \
 228     && TARGET_ALIGN_NATURAL == 0)                                       \
 229    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)      \
 230    : MAX ((COMPUTED), (SPECIFIED)))
 231
 232 /* Use the default for compiling target libs.  */
 233 #ifdef IN_TARGET_LIBS
 234 #undef TARGET_ALIGN_NATURAL
 235 #define TARGET_ALIGN_NATURAL 1
 236 #endif
 237
 238 /* Indicate that jump tables go in the text section.  */
 239 #undef  JUMP_TABLES_IN_TEXT_SECTION
 240 #define JUMP_TABLES_IN_TEXT_SECTION TARGET_64BIT
 241
 242 /* The linux ppc64 ABI isn't explicit on whether aggregates smaller
 243    than a doubleword should be padded upward or downward.  You could
 244    reasonably assume that they follow the normal rules for structure
 245    layout treating the parameter area as any other block of memory,
 246    then map the reg param area to registers.  i.e. pad upward.
 247    Setting both of the following defines results in this behavior.
 248    Setting just the first one will result in aggregates that fit in a
 249    doubleword being padded downward, and others being padded upward.
 250    Not a bad idea as this results in struct { int x; } being passed
 251    the same way as an int.  */
 252 #define AGGREGATE_PADDING_FIXED TARGET_64BIT
 253 #define AGGREGATES_PAD_UPWARD_ALWAYS 0
 254
 255 /* Specify padding for the last element of a block move between
 256    registers and memory.  FIRST is nonzero if this is the only
 257    element.  */
 258 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 259   (!(FIRST) ? PAD_UPWARD : targetm.calls.function_arg_padding (MODE, TYPE))
 260
 261 /* Linux doesn't support saving and restoring 64-bit regs in a 32-bit
 262    process.  */
 263 #define OS_MISSING_POWERPC64 !TARGET_64BIT
 264
 265 #ifdef SINGLE_LIBC
 266 #define OPTION_GLIBC_P(opts)    (DEFAULT_LIBC == LIBC_GLIBC)
 267 #define OPTION_UCLIBC_P(opts)   (DEFAULT_LIBC == LIBC_UCLIBC)
 268 #define OPTION_BIONIC_P(opts)   (DEFAULT_LIBC == LIBC_BIONIC)
 269 #undef OPTION_MUSL_P
 270 #define OPTION_MUSL_P(opts)     (DEFAULT_LIBC == LIBC_MUSL)
 271 #else
 272 #define OPTION_GLIBC_P(opts)    ((opts)->x_linux_libc == LIBC_GLIBC)
 273 #define OPTION_UCLIBC_P(opts)   ((opts)->x_linux_libc == LIBC_UCLIBC)
 274 #define OPTION_BIONIC_P(opts)   ((opts)->x_linux_libc == LIBC_BIONIC)
 275 #undef OPTION_MUSL_P
 276 #define OPTION_MUSL_P(opts)     ((opts)->x_linux_libc == LIBC_MUSL)
 277 #endif
 278 #define OPTION_GLIBC            OPTION_GLIBC_P (&global_options)
 279 #define OPTION_UCLIBC           OPTION_UCLIBC_P (&global_options)
 280 #define OPTION_BIONIC           OPTION_BIONIC_P (&global_options)
 281 #undef OPTION_MUSL
 282 #define OPTION_MUSL             OPTION_MUSL_P (&global_options)
 283
 284 /* Determine what functions are present at the runtime;
 285    this includes full c99 runtime and sincos.  */
 286 #undef TARGET_LIBC_HAS_FUNCTION
 287 #define TARGET_LIBC_HAS_FUNCTION linux_libc_has_function
 288
 289 #undef TARGET_LIBM_FUNCTION_MAX_ERROR
 290 #define TARGET_LIBM_FUNCTION_MAX_ERROR rs6000_linux_libm_function_max_error
 291
 292 #undef  TARGET_OS_CPP_BUILTINS
 293 #define TARGET_OS_CPP_BUILTINS()                        \
 294   do                                                    \
 295     {                                                   \
 296       if (strcmp (rs6000_abi_name, "linux") == 0        \
 297           || strcmp (rs6000_abi_name, "aixdesc") == 0)  \
 298         GNU_USER_TARGET_OS_CPP_BUILTINS();              \
 299       if (TARGET_64BIT)                                 \
 300         {                                               \
 301           builtin_define ("__PPC__");                   \
 302           builtin_define ("__PPC64__");                 \
 303           builtin_define ("__powerpc__");               \
 304           builtin_define ("__powerpc64__");             \
 305           if (!DOT_SYMBOLS)                             \
 306             builtin_define ("_CALL_LINUX");             \
 307           builtin_assert ("cpu=powerpc64");             \
 308           builtin_assert ("machine=powerpc64");         \
 309         }                                               \
 310       else                                              \
 311         {                                               \
 312           builtin_define_std ("PPC");                   \
 313           builtin_define_std ("powerpc");               \
 314           builtin_assert ("cpu=powerpc");               \
 315           builtin_assert ("machine=powerpc");           \
 316           TARGET_OS_SYSV_CPP_BUILTINS ();               \
 317         }                                               \
 318     }                                                   \
 319   while (0)
 320
 321 #undef  CPP_OS_DEFAULT_SPEC
 322 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux) %(include_extra)"
 323
 324 #undef  LINK_SHLIB_SPEC
 325 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}} \
 326   %{static-pie:-static -pie --no-dynamic-linker -z text}"
 327
 328 #undef  LIB_DEFAULT_SPEC
 329 #define LIB_DEFAULT_SPEC "%(lib_linux)"
 330
 331 #undef  STARTFILE_DEFAULT_SPEC
 332 #define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
 333
 334 #undef  ENDFILE_DEFAULT_SPEC
 335 #define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
 336
 337 #undef  LINK_START_DEFAULT_SPEC
 338 #define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
 339
 340 #undef  LINK_OS_DEFAULT_SPEC
 341 #define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
 342
 343 #define GLIBC_DYNAMIC_LINKER32 "%(dynamic_linker_prefix)/lib/ld.so.1"
 344
 345 #ifdef LINUX64_DEFAULT_ABI_ELFv2
 346 #define GLIBC_DYNAMIC_LINKER64 \
 347 "%{mabi=elfv1:%(dynamic_linker_prefix)/lib64/ld64.so.1;" \
 348 ":%(dynamic_linker_prefix)/lib64/ld64.so.2}"
 349 #else
 350 #define GLIBC_DYNAMIC_LINKER64 \
 351 "%{mabi=elfv2:%(dynamic_linker_prefix)/lib64/ld64.so.2;" \
 352 ":%(dynamic_linker_prefix)/lib64/ld64.so.1}"
 353 #endif
 354
 355 #undef MUSL_DYNAMIC_LINKER32
 356 #define MUSL_DYNAMIC_LINKER32 \
 357   "/lib/ld-musl-powerpc" MUSL_DYNAMIC_LINKER_E "%{msoft-float:-sf}.so.1"
 358 #undef MUSL_DYNAMIC_LINKER64
 359 #define MUSL_DYNAMIC_LINKER64 \
 360   "/lib/ld-musl-powerpc64" MUSL_DYNAMIC_LINKER_E "%{msoft-float:-sf}.so.1"
 361
 362 #undef  DEFAULT_ASM_ENDIAN
 363 #if (TARGET_DEFAULT & MASK_LITTLE_ENDIAN)
 364 #define DEFAULT_ASM_ENDIAN " -mlittle"
 365 #define LINK_OS_LINUX_EMUL32 ENDIAN_SELECT(" -m elf32ppclinux",         \
 366                                            " -m elf32lppclinux",        \
 367                                            " -m elf32lppclinux")
 368 #define LINK_OS_LINUX_EMUL64 ENDIAN_SELECT(" -m elf64ppc",              \
 369                                            " -m elf64lppc",             \
 370                                            " -m elf64lppc")
 371 #else
 372 #define DEFAULT_ASM_ENDIAN " -mbig"
 373 #define LINK_OS_LINUX_EMUL32 ENDIAN_SELECT(" -m elf32ppclinux",         \
 374                                            " -m elf32lppclinux",        \
 375                                            " -m elf32ppclinux")
 376 #define LINK_OS_LINUX_EMUL64 ENDIAN_SELECT(" -m elf64ppc",              \
 377                                            " -m elf64lppc",             \
 378                                            " -m elf64ppc")
 379 #endif
 380
 381 #define LINK_OS_LINUX_SPEC32 LINK_OS_LINUX_EMUL32 " %{!shared: %{!static: \
 382   %{!static-pie: \
 383     %{rdynamic:-export-dynamic} \
 384     -dynamic-linker " GNU_USER_DYNAMIC_LINKER32 "}}} \
 385   %(link_os_extra_spec32)"
 386
 387 #define LINK_OS_LINUX_SPEC64 LINK_OS_LINUX_EMUL64 " %{!shared: %{!static: \
 388   %{!static-pie: \
 389     %{rdynamic:-export-dynamic} \
 390     -dynamic-linker " GNU_USER_DYNAMIC_LINKER64 "}}} \
 391   %(link_os_extra_spec64)"
 392
 393 /* Use gnu-user.h LINK_GCC_SEQUENCE_SPEC for linux.  */
 394 #undef LINK_GCC_C_SEQUENCE_SPEC
 395 #define LINK_GCC_C_SEQUENCE_SPEC \
 396   "%{mads|myellowknife|mmvme|msim:%G %L %G;" \
 397   "!mcall-*|mcall-linux:" GNU_USER_TARGET_LINK_GCC_C_SEQUENCE_SPEC ";" \
 398   ":%G %L %G}"
 399
 400 #undef  TOC_SECTION_ASM_OP
 401 #define TOC_SECTION_ASM_OP \
 402   (TARGET_64BIT                                         \
 403    ? "\t.section\t\".toc\",\"aw\""                      \
 404    : "\t.section\t\".got\",\"aw\"")
 405
 406 #undef  MINIMAL_TOC_SECTION_ASM_OP
 407 #define MINIMAL_TOC_SECTION_ASM_OP \
 408   (TARGET_64BIT                                         \
 409    ? "\t.section\t\".toc1\",\"aw\""                     \
 410    : (flag_pic                                          \
 411       ? "\t.section\t\".got2\",\"aw\""                  \
 412       : "\t.section\t\".got1\",\"aw\""))
 413
 414 /* Must be at least as big as our pointer type.  */
 415 #undef  SIZE_TYPE
 416 #define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int")
 417
 418 #undef  PTRDIFF_TYPE
 419 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
 420
 421 #undef  WCHAR_TYPE
 422 #define WCHAR_TYPE (TARGET_64BIT ? "int" : "long int")
 423 #undef  WCHAR_TYPE_SIZE
 424 #define WCHAR_TYPE_SIZE 32
 425
 426 #undef  RS6000_MCOUNT
 427 #define RS6000_MCOUNT "_mcount"
 428
 429 #ifdef __powerpc64__
 430 /* _init and _fini functions are built from bits spread across many
 431    object files, each potentially with a different TOC pointer.  For
 432    that reason, place a nop after the call so that the linker can
 433    restore the TOC pointer if a TOC adjusting call stub is needed.  */
 434 #if DOT_SYMBOLS
 435 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 436   asm (SECTION_OP "\n"                                  \
 437 "       bl ." #FUNC "\n"                                \
 438 "       nop\n"                                          \
 439 "       .previous");
 440 #else
 441 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 442   asm (SECTION_OP "\n"                                  \
 443 "       bl " #FUNC "\n"                                 \
 444 "       nop\n"                                          \
 445 "       .previous");
 446 #endif
 447 #endif
 448
 449 /* FP save and restore routines.  */
 450 #undef  SAVE_FP_PREFIX
 451 #define SAVE_FP_PREFIX (TARGET_64BIT ? "._savef" : "_savefpr_")
 452 #undef  SAVE_FP_SUFFIX
 453 #define SAVE_FP_SUFFIX ""
 454 #undef  RESTORE_FP_PREFIX
 455 #define RESTORE_FP_PREFIX (TARGET_64BIT ? "._restf" : "_restfpr_")
 456 #undef  RESTORE_FP_SUFFIX
 457 #define RESTORE_FP_SUFFIX ""
 458
 459 /* Dwarf2 debugging.  */
 460 #undef  PREFERRED_DEBUGGING_TYPE
 461 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 462
 463 /* This is how to declare the size of a function.  */
 464 #undef  ASM_DECLARE_FUNCTION_SIZE
 465 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 466   do                                                                    \
 467     {                                                                   \
 468       if (!flag_inhibit_size_directive)                                 \
 469         {                                                               \
 470           fputs ("\t.size\t", (FILE));                                  \
 471           if (TARGET_64BIT && DOT_SYMBOLS)                              \
 472             putc ('.', (FILE));                                         \
 473           assemble_name ((FILE), (FNAME));                              \
 474           fputs (",.-", (FILE));                                        \
 475           rs6000_output_function_entry (FILE, FNAME);                   \
 476           putc ('\n', (FILE));                                          \
 477         }                                                               \
 478     }                                                                   \
 479   while (0)
 480
 481 /* Return nonzero if this entry is to be written into the constant
 482    pool in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF
 483    or a CONST containing one of them.  If -mfp-in-toc (the default),
 484    we also do this for floating-point constants.  We actually can only
 485    do this if the FP formats of the target and host machines are the
 486    same, but we can't check that since not every file that uses
 487    the macros includes real.h.  We also do this when we can write an
 488    integer into the TOC and the entry is not larger than a TOC entry,
 489    but not for -mcmodel=medium where we'll use a toc-relative load for
 490    constants outside the TOC.  */
 491
 492 #undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
 493 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
 494   (TARGET_TOC                                                           \
 495    && (SYMBOL_REF_P (X)                                                 \
 496        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
 497            && SYMBOL_REF_P (XEXP (XEXP (X, 0), 0)))                     \
 498        || GET_CODE (X) == LABEL_REF                                     \
 499        || (CONST_INT_P (X)                                              \
 500            && TARGET_CMODEL != CMODEL_MEDIUM                            \
 501            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
 502        || (CONST_DOUBLE_P (X)                                           \
 503            && ((TARGET_64BIT                                            \
 504                 && (TARGET_MINIMAL_TOC                                  \
 505                     || (SCALAR_FLOAT_MODE_P (GET_MODE (X))              \
 506                         && ! TARGET_NO_FP_IN_TOC)))                     \
 507                || (!TARGET_64BIT                                        \
 508                    && !TARGET_NO_FP_IN_TOC                              \
 509                    && SCALAR_FLOAT_MODE_P (GET_MODE (X))                \
 510                    && BITS_PER_WORD == HOST_BITS_PER_INT)))))
 511
 512 /* Select a format to encode pointers in exception handling data.  CODE
 513    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
 514    true if the symbol may be affected by dynamic relocations.  */
 515 #undef  ASM_PREFERRED_EH_DATA_FORMAT
 516 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 517   (TARGET_64BIT || flag_pic                                             \
 518    ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel               \
 519       | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4))             \
 520    : DW_EH_PE_absptr)
 521
 522 /* For backward compatibility, we must continue to use the AIX
 523    structure return convention.  */
 524 #undef DRAFT_V4_STRUCT_RET
 525 #define DRAFT_V4_STRUCT_RET (!TARGET_64BIT)
 526
 527 #ifdef TARGET_LIBC_PROVIDES_SSP
 528 /* ppc32 glibc provides __stack_chk_guard in -0x7008(2),
 529    ppc64 glibc provides it at -0x7010(13).  */
 530 #define TARGET_THREAD_SSP_OFFSET        (TARGET_64BIT ? -0x7010 : -0x7008)
 531 #endif
 532
 533 #define POWERPC_LINUX
 534
 535 /* ppc{32,64} linux has 128-bit long double support in glibc 2.4 and later.  */
 536 #ifdef TARGET_DEFAULT_LONG_DOUBLE_128
 537 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
 538 #endif
 539
 540 /* Static stack checking is supported by means of probes.  */
 541 #define STACK_CHECK_STATIC_BUILTIN 1
 542
 543 /* The default value isn't sufficient in 64-bit mode.  */
 544 #define STACK_CHECK_PROTECT (TARGET_64BIT ? 16 * 1024 : 12 * 1024)
 545
 546 /* Software floating point support for exceptions and rounding modes
 547    depends on the C library in use.  */
 548 #undef TARGET_FLOAT_EXCEPTIONS_ROUNDING_SUPPORTED_P
 549 #define TARGET_FLOAT_EXCEPTIONS_ROUNDING_SUPPORTED_P \
 550   rs6000_linux_float_exceptions_rounding_supported_p
 551
 552 /* Support for TARGET_ATOMIC_ASSIGN_EXPAND_FENV without FPRs depends
 553    on glibc 2.19 or greater.  */
 554 #if TARGET_GLIBC_MAJOR > 2 \
 555   || (TARGET_GLIBC_MAJOR == 2 && TARGET_GLIBC_MINOR >= 19)
 556 #define RS6000_GLIBC_ATOMIC_FENV 1
 557 #endif
 558
 559 /* The IEEE 128-bit emulator is only built on Linux systems.  Flag that we
 560    should enable the type handling for KFmode on VSX systems even if we are not
 561    enabling the __float128 keyword.  */
 562 #undef  TARGET_FLOAT128_ENABLE_TYPE
 563 #define TARGET_FLOAT128_ENABLE_TYPE 1
 564
 565 /* Enable using prefixed PC-relative addressing on POWER10 if the ABI
 566    supports it.  The ELF v2 ABI only supports PC-relative relocations for
 567    the medium code model.  */
 568 #define PCREL_SUPPORTED_BY_OS   (TARGET_POWER10 && TARGET_PREFIXED      \
 569                                  && ELFv2_ABI_CHECK                     \
 570                                  && TARGET_CMODEL == CMODEL_MEDIUM)