gcc/config/rs6000/freebsd64.h

   1 /* Definitions for 64-bit PowerPC running FreeBSD using the ELF format
   2    Copyright (C) 2012-2015 Free Software Foundation, Inc.
   3
   4    This file is part of GCC.
   5
   6    GCC is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU General Public License as published
   8    by the Free Software Foundation; either version 3, or (at your
   9    option) any later version.
  10
  11    GCC is distributed in the hope that it will be useful, but WITHOUT
  12    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  14    License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with GCC; see the file COPYING3.  If not see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 /* Override the defaults, which exist to force the proper definition.  */
  21
  22 #ifdef IN_LIBGCC2
  23 #undef TARGET_64BIT
  24 #ifdef __powerpc64__
  25 #define TARGET_64BIT 1
  26 #else
  27 #define TARGET_64BIT 0
  28 #endif
  29 #endif
  30
  31 #undef  TARGET_AIX
  32 #define TARGET_AIX TARGET_64BIT
  33
  34 #ifdef HAVE_LD_NO_DOT_SYMS
  35 /* New ABI uses a local sym for the function entry point.  */
  36 extern int dot_symbols;
  37 #undef DOT_SYMBOLS
  38 #define DOT_SYMBOLS dot_symbols
  39 #endif
  40
  41 #define TARGET_USES_LINUX64_OPT 1
  42 #ifdef HAVE_LD_LARGE_TOC
  43 #undef TARGET_CMODEL
  44 #define TARGET_CMODEL rs6000_current_cmodel
  45 #define SET_CMODEL(opt) rs6000_current_cmodel = opt
  46 #else
  47 #define SET_CMODEL(opt) do {} while (0)
  48 #endif
  49
  50 /* Until now the 970 is the only Processor where FreeBSD 64-bit runs on.  */
  51 #undef  PROCESSOR_DEFAULT
  52 #define PROCESSOR_DEFAULT PROCESSOR_POWER4
  53 #undef  PROCESSOR_DEFAULT64
  54 #define PROCESSOR_DEFAULT64 PROCESSOR_POWER4
  55
  56 /* We don't need to generate entries in .fixup, except when
  57    -mrelocatable or -mrelocatable-lib is given.  */
  58 #undef RELOCATABLE_NEEDS_FIXUP
  59 #define RELOCATABLE_NEEDS_FIXUP \
  60   (rs6000_isa_flags & rs6000_isa_flags_explicit & OPTION_MASK_RELOCATABLE)
  61
  62 #undef  RS6000_ABI_NAME
  63 #define RS6000_ABI_NAME "freebsd"
  64
  65 #define INVALID_64BIT "-m%s not supported in this configuration"
  66 #define INVALID_32BIT INVALID_64BIT
  67
  68 /* Use LINUX64 instead of FREEBSD64 for compat with e.g. sysv4le.h */
  69 #ifdef LINUX64_DEFAULT_ABI_ELFv2
  70 #define ELFv2_ABI_CHECK (rs6000_elf_abi != 1)
  71 #else
  72 #define ELFv2_ABI_CHECK (rs6000_elf_abi == 2)
  73 #endif
  74
  75 #undef  SUBSUBTARGET_OVERRIDE_OPTIONS
  76 #define SUBSUBTARGET_OVERRIDE_OPTIONS                           \
  77   do                                                            \
  78     {                                                           \
  79       if (!global_options_set.x_rs6000_alignment_flags)         \
  80         rs6000_alignment_flags = MASK_ALIGN_NATURAL;            \
  81       if (TARGET_64BIT)                                         \
  82         {                                                       \
  83           if (DEFAULT_ABI != ABI_AIX)                           \
  84             {                                                   \
  85               rs6000_current_abi = ABI_AIX;                     \
  86               error (INVALID_64BIT, "call");                    \
  87             }                                                   \
  88           dot_symbols = !strcmp (rs6000_abi_name, "aixdesc");   \
  89           if (rs6000_isa_flags & OPTION_MASK_RELOCATABLE)       \
  90             {                                                   \
  91               rs6000_isa_flags &= ~OPTION_MASK_RELOCATABLE;     \
  92               error (INVALID_64BIT, "relocatable");             \
  93             }                                                   \
  94           if (ELFv2_ABI_CHECK)                                  \
  95             {                                                   \
  96               rs6000_current_abi = ABI_ELFv2;                   \
  97               if (dot_symbols)                                  \
  98                 error ("-mcall-aixdesc incompatible with -mabi=elfv2"); \
  99             }                                                   \
 100           if (rs6000_isa_flags & OPTION_MASK_EABI)              \
 101             {                                                   \
 102               rs6000_isa_flags &= ~OPTION_MASK_EABI;            \
 103               error (INVALID_64BIT, "eabi");                    \
 104             }                                                   \
 105           if (TARGET_PROTOTYPE)                                 \
 106             {                                                   \
 107               target_prototype = 0;                             \
 108               error (INVALID_64BIT, "prototype");               \
 109             }                                                   \
 110           if ((rs6000_isa_flags & OPTION_MASK_POWERPC64) == 0)  \
 111             {                                                   \
 112               rs6000_isa_flags |= OPTION_MASK_POWERPC64;        \
 113               error ("-m64 requires a PowerPC64 cpu");          \
 114             }                                                   \
 115            if ((rs6000_isa_flags_explicit                       \
 116                 & OPTION_MASK_MINIMAL_TOC) != 0)                \
 117             {                                                   \
 118               if (global_options_set.x_rs6000_current_cmodel    \
 119                   && rs6000_current_cmodel != CMODEL_SMALL)     \
 120                 error ("-mcmodel incompatible with other toc options"); \
 121               SET_CMODEL (CMODEL_SMALL);                        \
 122             }                                                   \
 123           else                                                  \
 124             {                                                   \
 125               if (!global_options_set.x_rs6000_current_cmodel)  \
 126                 SET_CMODEL (CMODEL_MEDIUM);                     \
 127               if (rs6000_current_cmodel != CMODEL_SMALL)        \
 128                 {                                               \
 129                   TARGET_NO_FP_IN_TOC = 0;                      \
 130                   TARGET_NO_SUM_IN_TOC = 0;                     \
 131                 }                                               \
 132             }                                                   \
 133         }                                                       \
 134     }                                                           \
 135   while (0)
 136
 137 #undef  ASM_DEFAULT_SPEC
 138 #undef  ASM_SPEC
 139 #undef  LINK_OS_FREEBSD_SPEC
 140
 141 #define ASM_DEFAULT_SPEC "-mppc%{!m32:64}"
 142 #define ASM_SPEC         "%{m32:%(asm_spec32)}%{!m32:%(asm_spec64)} %(asm_spec_common)"
 143 #define LINK_OS_FREEBSD_SPEC "%{m32:%(link_os_freebsd_spec32)}%{!m32:%(link_os_freebsd_spec64)}"
 144
 145 #define ASM_SPEC32 "-a32 \
 146 %{mrelocatable} %{mrelocatable-lib} %{" FPIE_OR_FPIC_SPEC ":-K PIC} \
 147 %{memb} %{!memb: %{msdata=eabi: -memb}} \
 148 %{!mlittle: %{!mlittle-endian: %{!mbig: %{!mbig-endian: \
 149     %{mcall-freebsd: -mbig} \
 150     %{mcall-i960-old: -mlittle} \
 151     %{mcall-linux: -mbig} \
 152     %{mcall-gnu: -mbig} \
 153     %{mcall-netbsd: -mbig} \
 154 }}}}"
 155
 156 #define ASM_SPEC64 "-a64"
 157
 158 #define ASM_SPEC_COMMON "%(asm_cpu) \
 159 %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}} \
 160 %{mlittle} %{mlittle-endian} %{mbig} %{mbig-endian}"
 161
 162 #undef  SUBSUBTARGET_EXTRA_SPECS
 163 #define SUBSUBTARGET_EXTRA_SPECS                                        \
 164   { "asm_spec_common",          ASM_SPEC_COMMON },                      \
 165   { "asm_spec32",               ASM_SPEC32 },                           \
 166   { "asm_spec64",               ASM_SPEC64 },                           \
 167   { "link_os_freebsd_spec32",   LINK_OS_FREEBSD_SPEC32 },               \
 168   { "link_os_freebsd_spec64",   LINK_OS_FREEBSD_SPEC64 },
 169
 170 #define FREEBSD_DYNAMIC_LINKER32 "/libexec/ld-elf32.so.1"
 171 #define FREEBSD_DYNAMIC_LINKER64 "/libexec/ld-elf.so.1"
 172
 173 #define LINK_OS_FREEBSD_SPEC_DEF32 "\
 174   %{p:%nconsider using `-pg' instead of `-p' with gprof(1)} \
 175   %{v:-V} \
 176   %{assert*} %{R*} %{rpath*} %{defsym*} \
 177   %{shared:-Bshareable %{h*} %{soname*}} \
 178   %{!shared: \
 179     %{!static: \
 180       %{rdynamic: -export-dynamic} \
 181       %{!dynamic-linker:-dynamic-linker " FREEBSD_DYNAMIC_LINKER32 "}} \
 182     %{static:-Bstatic}} \
 183   %{symbolic:-Bsymbolic}"
 184
 185 #define LINK_OS_FREEBSD_SPEC_DEF64 "\
 186   %{p:%nconsider using `-pg' instead of `-p' with gprof(1)} \
 187   %{v:-V} \
 188   %{assert*} %{R*} %{rpath*} %{defsym*} \
 189   %{shared:-Bshareable %{h*} %{soname*}} \
 190   %{!shared: \
 191     %{!static: \
 192       %{rdynamic: -export-dynamic} \
 193       %{!dynamic-linker:-dynamic-linker " FREEBSD_DYNAMIC_LINKER64 "}} \
 194     %{static:-Bstatic}} \
 195   %{symbolic:-Bsymbolic}"
 196
 197 #define LINK_OS_FREEBSD_SPEC32 "-melf32ppc_fbsd " LINK_OS_FREEBSD_SPEC_DEF32
 198
 199 #define LINK_OS_FREEBSD_SPEC64 "-melf64ppc_fbsd " LINK_OS_FREEBSD_SPEC_DEF64
 200
 201 #undef  MULTILIB_DEFAULTS
 202 #define MULTILIB_DEFAULTS { "m64" }
 203
 204 /* PowerPC-64 FreeBSD increases natural record alignment to doubleword if
 205    the first field is an FP double, only if in power alignment mode.  */
 206 #undef  ROUND_TYPE_ALIGN
 207 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                   \
 208   ((TARGET_64BIT                                                        \
 209     && (TREE_CODE (STRUCT) == RECORD_TYPE                               \
 210         || TREE_CODE (STRUCT) == UNION_TYPE                             \
 211         || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                       \
 212     && TARGET_ALIGN_NATURAL == 0)                                       \
 213    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)      \
 214    : MAX ((COMPUTED), (SPECIFIED)))
 215
 216 /* Use the default for compiling target libs.  */
 217 #ifdef IN_TARGET_LIBS
 218 #undef TARGET_ALIGN_NATURAL
 219 #define TARGET_ALIGN_NATURAL 1
 220 #endif
 221
 222 /* Indicate that jump tables go in the text section.  */
 223 #undef  JUMP_TABLES_IN_TEXT_SECTION
 224 #define JUMP_TABLES_IN_TEXT_SECTION TARGET_64BIT
 225
 226 /* The linux ppc64 ABI isn't explicit on whether aggregates smaller
 227    than a doubleword should be padded upward or downward.  You could
 228    reasonably assume that they follow the normal rules for structure
 229    layout treating the parameter area as any other block of memory,
 230    then map the reg param area to registers.  i.e. pad upward.
 231    Setting both of the following defines results in this behavior.
 232    Setting just the first one will result in aggregates that fit in a
 233    doubleword being padded downward, and others being padded upward.
 234    Not a bad idea as this results in struct { int x; } being passed
 235    the same way as an int.  */
 236 #define AGGREGATE_PADDING_FIXED TARGET_64BIT
 237 #define AGGREGATES_PAD_UPWARD_ALWAYS 0
 238
 239 /* Specify padding for the last element of a block move between
 240    registers and memory.  FIRST is nonzero if this is the only
 241    element.  */
 242 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 243   (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
 244
 245 /* FreeBSD doesn't support saving and restoring 64-bit regs with a 32-bit
 246    kernel. This is supported when running on a 64-bit kernel with
 247    COMPAT_FREEBSD32, but tell GCC it isn't so that our 32-bit binaries
 248    are compatible. */
 249 #define OS_MISSING_POWERPC64 !TARGET_64BIT
 250
 251 #undef  FBSD_TARGET_CPU_CPP_BUILTINS
 252 #define FBSD_TARGET_CPU_CPP_BUILTINS()                  \
 253   do                                                    \
 254     {                                                   \
 255       builtin_define ("__PPC__");                       \
 256       builtin_define ("__ppc__");                       \
 257       builtin_define ("__powerpc__");                   \
 258       if (TARGET_64BIT)                                 \
 259         {                                               \
 260           builtin_define ("__arch64__");                \
 261           builtin_define ("__LP64__");                  \
 262           builtin_define ("__PPC64__");                 \
 263           builtin_define ("__powerpc64__");             \
 264           builtin_assert ("cpu=powerpc64");             \
 265           builtin_assert ("machine=powerpc64");         \
 266         }                                               \
 267       else                                              \
 268         {                                               \
 269           builtin_define_std ("PPC");                   \
 270           builtin_define_std ("powerpc");               \
 271           builtin_assert ("cpu=powerpc");               \
 272           builtin_assert ("machine=powerpc");           \
 273           TARGET_OS_SYSV_CPP_BUILTINS ();               \
 274         }                                               \
 275     }                                                   \
 276   while (0)
 277
 278 #undef  CPP_OS_DEFAULT_SPEC
 279 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_freebsd)"
 280
 281 #undef CPP_OS_FREEBSD_SPEC
 282 #define CPP_OS_FREEBSD_SPEC ""
 283
 284 #undef  STARTFILE_DEFAULT_SPEC
 285 #define STARTFILE_DEFAULT_SPEC "%(startfile_freebsd)"
 286
 287 #undef  ENDFILE_DEFAULT_SPEC
 288 #define ENDFILE_DEFAULT_SPEC "%(endfile_freebsd)"
 289
 290 #undef  LIB_DEFAULT_SPEC
 291 #define LIB_DEFAULT_SPEC "%(lib_freebsd)"
 292
 293 #undef  LINK_START_DEFAULT_SPEC
 294 #define LINK_START_DEFAULT_SPEC "%(link_start_freebsd)"
 295
 296 #undef  LINK_OS_DEFAULT_SPEC
 297 #define LINK_OS_DEFAULT_SPEC "%(link_os_freebsd)"
 298
 299 /* XXX: This is wrong for many platforms in sysv4.h.
 300    We should work on getting that definition fixed.  */
 301 #undef  LINK_SHLIB_SPEC
 302 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
 303
 304
 305 /************************[  Target stuff  ]***********************************/
 306
 307 /* Define the actual types of some ANSI-mandated types.
 308    Needs to agree with <machine/ansi.h>.  GCC defaults come from c-decl.c,
 309    c-common.c, and config/<arch>/<arch>.h.  */
 310
 311
 312 #undef  SIZE_TYPE
 313 #define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int")
 314
 315 #undef  PTRDIFF_TYPE
 316 #define PTRDIFF_TYPE    (TARGET_64BIT ? "long int" : "int")
 317
 318 /* rs6000.h gets this wrong for FreeBSD.  We use the GCC defaults instead.  */
 319 #undef WCHAR_TYPE
 320
 321 #undef  WCHAR_TYPE_SIZE
 322 #define WCHAR_TYPE_SIZE 32
 323
 324
 325 /* Override rs6000.h definition.  */
 326 #undef  ASM_APP_ON
 327 #define ASM_APP_ON "#APP\n"
 328
 329 /* Override rs6000.h definition.  */
 330 #undef  ASM_APP_OFF
 331 #define ASM_APP_OFF "#NO_APP\n"
 332
 333 /* Function profiling bits */
 334 #undef  RS6000_MCOUNT
 335 #define RS6000_MCOUNT "_mcount"
 336
 337 #define PROFILE_HOOK(LABEL) \
 338   do { if (TARGET_64BIT) output_profile_hook (LABEL); } while (0)
 339
 340 /* _init and _fini functions are built from bits spread across many
 341    object files, each potentially with a different TOC pointer.  For
 342    that reason, place a nop after the call so that the linker can
 343    restore the TOC pointer if a TOC adjusting call stub is needed.  */
 344 #ifdef __powerpc64__
 345 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 346   asm (SECTION_OP "\n"                                  \
 347 "       bl " #FUNC "\n"                                 \
 348 "       nop\n"                                          \
 349 "       .previous");
 350 #endif
 351
 352 /* FP save and restore routines.  */
 353 #undef  SAVE_FP_PREFIX
 354 #define SAVE_FP_PREFIX (TARGET_64BIT ? "._savef" : "_savefpr_")
 355 #undef  SAVE_FP_SUFFIX
 356 #define SAVE_FP_SUFFIX ""
 357 #undef  RESTORE_FP_PREFIX
 358 #define RESTORE_FP_PREFIX (TARGET_64BIT ? "._restf" : "_restfpr_")
 359 #undef  RESTORE_FP_SUFFIX
 360 #define RESTORE_FP_SUFFIX ""
 361
 362 /* Select a format to encode pointers in exception handling data.  CODE
 363    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
 364    true if the symbol may be affected by dynamic relocations.  */
 365 #undef  ASM_PREFERRED_EH_DATA_FORMAT
 366 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 367   ((TARGET_64BIT || flag_pic || TARGET_RELOCATABLE)                     \
 368    ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel               \
 369       | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4))             \
 370    : DW_EH_PE_absptr)
 371
 372 /* Static stack checking is supported by means of probes.  */
 373 #define STACK_CHECK_STATIC_BUILTIN 1
 374
 375 /* The default value isn't sufficient in 64-bit mode.  */
 376 #define STACK_CHECK_PROTECT (TARGET_64BIT ? 16 * 1024 : 12 * 1024)
 377
 378 /* Use standard DWARF numbering for DWARF debugging information.  */
 379 #define RS6000_USE_DWARF_NUMBERING
 380
 381 /* PowerPC64 Linux word-aligns FP doubles when -malign-power is given.  */
 382 #undef  ADJUST_FIELD_ALIGN
 383 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
 384   (rs6000_special_adjust_field_align_p ((FIELD), (COMPUTED))            \
 385    ? 128                                                                \
 386    : (TARGET_64BIT                                                      \
 387       && TARGET_ALIGN_NATURAL == 0                                      \
 388       && TYPE_MODE (strip_array_types (TREE_TYPE (FIELD))) == DFmode)   \
 389    ? MIN ((COMPUTED), 32)                                               \
 390    : (COMPUTED))
 391
 392 #undef  TOC_SECTION_ASM_OP
 393 #define TOC_SECTION_ASM_OP \
 394   (TARGET_64BIT                                         \
 395    ? "\t.section\t\".toc\",\"aw\""                      \
 396    : "\t.section\t\".got\",\"aw\"")
 397
 398 #undef  MINIMAL_TOC_SECTION_ASM_OP
 399 #define MINIMAL_TOC_SECTION_ASM_OP \
 400   (TARGET_64BIT                                         \
 401    ? "\t.section\t\".toc1\",\"aw\""                     \
 402    : ((TARGET_RELOCATABLE || flag_pic)                  \
 403       ? "\t.section\t\".got2\",\"aw\""                  \
 404       : "\t.section\t\".got1\",\"aw\""))
 405
 406 /* This is how to declare the size of a function.  */
 407 #undef  ASM_DECLARE_FUNCTION_SIZE
 408 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 409   do                                                                    \
 410     {                                                                   \
 411       if (!flag_inhibit_size_directive)                                 \
 412         {                                                               \
 413           fputs ("\t.size\t", (FILE));                                  \
 414           if (TARGET_64BIT && DOT_SYMBOLS)                              \
 415             putc ('.', (FILE));                                         \
 416           assemble_name ((FILE), (FNAME));                              \
 417           fputs (",.-", (FILE));                                        \
 418           rs6000_output_function_entry (FILE, FNAME);                   \
 419           putc ('\n', (FILE));                                          \
 420         }                                                               \
 421     }                                                                   \
 422   while (0)
 423
 424 #undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
 425 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
 426   (TARGET_TOC                                                           \
 427    && (GET_CODE (X) == SYMBOL_REF                                       \
 428        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
 429            && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)           \
 430        || GET_CODE (X) == LABEL_REF                                     \
 431        || (GET_CODE (X) == CONST_INT                                    \
 432            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
 433        || (GET_CODE (X) == CONST_DOUBLE                                 \
 434            && ((TARGET_64BIT                                            \
 435                 && (TARGET_MINIMAL_TOC                                  \
 436                     || (SCALAR_FLOAT_MODE_P (GET_MODE (X))              \
 437                         && ! TARGET_NO_FP_IN_TOC)))                     \
 438                || (!TARGET_64BIT                                        \
 439                    && !TARGET_NO_FP_IN_TOC                              \
 440                    && !TARGET_RELOCATABLE                               \
 441                    && SCALAR_FLOAT_MODE_P (GET_MODE (X))                \
 442                    && BITS_PER_WORD == HOST_BITS_PER_INT)))))
 443
 444 /* Use --as-needed -lgcc_s for eh support.  */
 445 #ifdef HAVE_LD_AS_NEEDED
 446 #define USE_LD_AS_NEEDED 1
 447 #endif
 448
 449 #define POWERPC_FREEBSD