gcc/config/rs6000/freebsd64.h

   1 /* Definitions for 64-bit PowerPC running FreeBSD using the ELF format
   2    Copyright (C) 2012 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 #undef  SUBSUBTARGET_OVERRIDE_OPTIONS
  69 #define SUBSUBTARGET_OVERRIDE_OPTIONS                           \
  70   do                                                            \
  71     {                                                           \
  72       if (!global_options_set.x_rs6000_alignment_flags)         \
  73         rs6000_alignment_flags = MASK_ALIGN_NATURAL;            \
  74       if (TARGET_64BIT)                                         \
  75         {                                                       \
  76           if (DEFAULT_ABI != ABI_AIX)                           \
  77             {                                                   \
  78               rs6000_current_abi = ABI_AIX;                     \
  79               error (INVALID_64BIT, "call");                    \
  80             }                                                   \
  81           dot_symbols = !strcmp (rs6000_abi_name, "aixdesc");   \
  82           if (rs6000_isa_flags & OPTION_MASK_RELOCATABLE)       \
  83             {                                                   \
  84               rs6000_isa_flags &= ~OPTION_MASK_RELOCATABLE;     \
  85               error (INVALID_64BIT, "relocatable");             \
  86             }                                                   \
  87           if (rs6000_isa_flags & OPTION_MASK_EABI)              \
  88             {                                                   \
  89               rs6000_isa_flags &= ~OPTION_MASK_EABI;            \
  90               error (INVALID_64BIT, "eabi");                    \
  91             }                                                   \
  92           if (TARGET_PROTOTYPE)                                 \
  93             {                                                   \
  94               target_prototype = 0;                             \
  95               error (INVALID_64BIT, "prototype");               \
  96             }                                                   \
  97           if ((rs6000_isa_flags & OPTION_MASK_POWERPC64) == 0)  \
  98             {                                                   \
  99               rs6000_isa_flags |= OPTION_MASK_POWERPC64;        \
 100               error ("-m64 requires a PowerPC64 cpu");          \
 101             }                                                   \
 102            if ((rs6000_isa_flags_explicit                       \
 103                 & OPTION_MASK_MINIMAL_TOC) != 0)                \
 104             {                                                   \
 105               if (global_options_set.x_rs6000_current_cmodel    \
 106                   && rs6000_current_cmodel != CMODEL_SMALL)     \
 107                 error ("-mcmodel incompatible with other toc options"); \
 108               SET_CMODEL (CMODEL_SMALL);                        \
 109             }                                                   \
 110           else                                                  \
 111             {                                                   \
 112               if (!global_options_set.x_rs6000_current_cmodel)  \
 113                 SET_CMODEL (CMODEL_MEDIUM);                     \
 114               if (rs6000_current_cmodel != CMODEL_SMALL)        \
 115                 {                                               \
 116                   TARGET_NO_FP_IN_TOC = 0;                      \
 117                   TARGET_NO_SUM_IN_TOC = 0;                     \
 118                 }                                               \
 119             }                                                   \
 120         }                                                       \
 121     }                                                           \
 122   while (0)
 123
 124 #undef  ASM_DEFAULT_SPEC
 125 #undef  ASM_SPEC
 126 #undef  LINK_OS_FREEBSD_SPEC
 127
 128 #define ASM_DEFAULT_SPEC "-mppc%{!m32:64}"
 129 #define ASM_SPEC         "%{m32:%(asm_spec32)}%{!m32:%(asm_spec64)} %(asm_spec_common)"
 130 #define LINK_OS_FREEBSD_SPEC "%{m32:%(link_os_freebsd_spec32)}%{!m32:%(link_os_freebsd_spec64)}"
 131
 132 #define ASM_SPEC32 "-a32 \
 133 %{mrelocatable} %{mrelocatable-lib} %{fpic:-K PIC} %{fPIC:-K PIC} \
 134 %{memb} %{!memb: %{msdata=eabi: -memb}} \
 135 %{!mlittle: %{!mlittle-endian: %{!mbig: %{!mbig-endian: \
 136     %{mcall-freebsd: -mbig} \
 137     %{mcall-i960-old: -mlittle} \
 138     %{mcall-linux: -mbig} \
 139     %{mcall-gnu: -mbig} \
 140     %{mcall-netbsd: -mbig} \
 141 }}}}"
 142
 143 #define ASM_SPEC64 "-a64"
 144
 145 #define ASM_SPEC_COMMON "%(asm_cpu) \
 146 %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}} \
 147 %{mlittle} %{mlittle-endian} %{mbig} %{mbig-endian}"
 148
 149 #undef  SUBSUBTARGET_EXTRA_SPECS
 150 #define SUBSUBTARGET_EXTRA_SPECS                                        \
 151   { "asm_spec_common",          ASM_SPEC_COMMON },                      \
 152   { "asm_spec32",               ASM_SPEC32 },                           \
 153   { "asm_spec64",               ASM_SPEC64 },                           \
 154   { "link_os_freebsd_spec32",   LINK_OS_FREEBSD_SPEC32 },               \
 155   { "link_os_freebsd_spec64",   LINK_OS_FREEBSD_SPEC64 },
 156
 157 #define FREEBSD_DYNAMIC_LINKER32 "/libexec/ld-elf32.so.1"
 158 #define FREEBSD_DYNAMIC_LINKER64 "/libexec/ld-elf.so.1"
 159
 160 #define LINK_OS_FREEBSD_SPEC_DEF32 "\
 161   %{p:%nconsider using `-pg' instead of `-p' with gprof(1)} \
 162   %{v:-V} \
 163   %{assert*} %{R*} %{rpath*} %{defsym*} \
 164   %{shared:-Bshareable %{h*} %{soname*}} \
 165   %{!shared: \
 166     %{!static: \
 167       %{rdynamic: -export-dynamic} \
 168       %{!dynamic-linker:-dynamic-linker " FREEBSD_DYNAMIC_LINKER32 "}} \
 169     %{static:-Bstatic}} \
 170   %{symbolic:-Bsymbolic}"
 171
 172 #define LINK_OS_FREEBSD_SPEC_DEF64 "\
 173   %{p:%nconsider using `-pg' instead of `-p' with gprof(1)} \
 174   %{v:-V} \
 175   %{assert*} %{R*} %{rpath*} %{defsym*} \
 176   %{shared:-Bshareable %{h*} %{soname*}} \
 177   %{!shared: \
 178     %{!static: \
 179       %{rdynamic: -export-dynamic} \
 180       %{!dynamic-linker:-dynamic-linker " FREEBSD_DYNAMIC_LINKER64 "}} \
 181     %{static:-Bstatic}} \
 182   %{symbolic:-Bsymbolic}"
 183
 184 #define LINK_OS_FREEBSD_SPEC32 "-melf32ppc_fbsd " LINK_OS_FREEBSD_SPEC_DEF32
 185
 186 #define LINK_OS_FREEBSD_SPEC64 "-melf64ppc_fbsd " LINK_OS_FREEBSD_SPEC_DEF64
 187
 188 #undef  MULTILIB_DEFAULTS
 189 #define MULTILIB_DEFAULTS { "m64" }
 190
 191 /* PowerPC-64 FreeBSD increases natural record alignment to doubleword if
 192    the first field is an FP double, only if in power alignment mode.  */
 193 #undef  ROUND_TYPE_ALIGN
 194 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                   \
 195   ((TARGET_64BIT                                                        \
 196     && (TREE_CODE (STRUCT) == RECORD_TYPE                               \
 197         || TREE_CODE (STRUCT) == UNION_TYPE                             \
 198         || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                       \
 199     && TARGET_ALIGN_NATURAL == 0)                                       \
 200    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)      \
 201    : MAX ((COMPUTED), (SPECIFIED)))
 202
 203 /* Use the default for compiling target libs.  */
 204 #ifdef IN_TARGET_LIBS
 205 #undef TARGET_ALIGN_NATURAL
 206 #define TARGET_ALIGN_NATURAL 1
 207 #endif
 208
 209 /* Indicate that jump tables go in the text section.  */
 210 #undef  JUMP_TABLES_IN_TEXT_SECTION
 211 #define JUMP_TABLES_IN_TEXT_SECTION TARGET_64BIT
 212
 213 /* The linux ppc64 ABI isn't explicit on whether aggregates smaller
 214    than a doubleword should be padded upward or downward.  You could
 215    reasonably assume that they follow the normal rules for structure
 216    layout treating the parameter area as any other block of memory,
 217    then map the reg param area to registers.  i.e. pad upward.
 218    Setting both of the following defines results in this behavior.
 219    Setting just the first one will result in aggregates that fit in a
 220    doubleword being padded downward, and others being padded upward.
 221    Not a bad idea as this results in struct { int x; } being passed
 222    the same way as an int.  */
 223 #define AGGREGATE_PADDING_FIXED TARGET_64BIT
 224 #define AGGREGATES_PAD_UPWARD_ALWAYS 0
 225
 226 /* Specify padding for the last element of a block move between
 227    registers and memory.  FIRST is nonzero if this is the only
 228    element.  */
 229 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 230   (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
 231
 232 /* FreeBSD doesn't support saving and restoring 64-bit regs with a 32-bit
 233    kernel. This is supported when running on a 64-bit kernel with
 234    COMPAT_FREEBSD32, but tell GCC it isn't so that our 32-bit binaries
 235    are compatible. */
 236 #define OS_MISSING_POWERPC64 !TARGET_64BIT
 237
 238 #undef  FBSD_TARGET_CPU_CPP_BUILTINS
 239 #define FBSD_TARGET_CPU_CPP_BUILTINS()                  \
 240   do                                                    \
 241     {                                                   \
 242       builtin_define ("__PPC__");                       \
 243       builtin_define ("__ppc__");                       \
 244       builtin_define ("__powerpc__");                   \
 245       if (TARGET_64BIT)                                 \
 246         {                                               \
 247           builtin_define ("__arch64__");                \
 248           builtin_define ("__LP64__");                  \
 249           builtin_define ("__PPC64__");                 \
 250           builtin_define ("__powerpc64__");             \
 251           builtin_assert ("cpu=powerpc64");             \
 252           builtin_assert ("machine=powerpc64");         \
 253         }                                               \
 254       else                                              \
 255         {                                               \
 256           builtin_define_std ("PPC");                   \
 257           builtin_define_std ("powerpc");               \
 258           builtin_assert ("cpu=powerpc");               \
 259           builtin_assert ("machine=powerpc");           \
 260           TARGET_OS_SYSV_CPP_BUILTINS ();               \
 261         }                                               \
 262     }                                                   \
 263   while (0)
 264
 265 #undef  CPP_OS_DEFAULT_SPEC
 266 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_freebsd)"
 267
 268 #undef CPP_OS_FREEBSD_SPEC
 269 #define CPP_OS_FREEBSD_SPEC ""
 270
 271 #undef  STARTFILE_DEFAULT_SPEC
 272 #define STARTFILE_DEFAULT_SPEC "%(startfile_freebsd)"
 273
 274 #undef  ENDFILE_DEFAULT_SPEC
 275 #define ENDFILE_DEFAULT_SPEC "%(endfile_freebsd)"
 276
 277 #undef  LIB_DEFAULT_SPEC
 278 #define LIB_DEFAULT_SPEC "%(lib_freebsd)"
 279
 280 #undef  LINK_START_DEFAULT_SPEC
 281 #define LINK_START_DEFAULT_SPEC "%(link_start_freebsd)"
 282
 283 #undef  LINK_OS_DEFAULT_SPEC
 284 #define LINK_OS_DEFAULT_SPEC "%(link_os_freebsd)"
 285
 286 /* XXX: This is wrong for many platforms in sysv4.h.
 287    We should work on getting that definition fixed.  */
 288 #undef  LINK_SHLIB_SPEC
 289 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
 290
 291
 292 /************************[  Target stuff  ]***********************************/
 293
 294 /* Define the actual types of some ANSI-mandated types.
 295    Needs to agree with <machine/ansi.h>.  GCC defaults come from c-decl.c,
 296    c-common.c, and config/<arch>/<arch>.h.  */
 297
 298
 299 #undef  SIZE_TYPE
 300 #define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int")
 301
 302 #undef  PTRDIFF_TYPE
 303 #define PTRDIFF_TYPE    (TARGET_64BIT ? "long int" : "int")
 304
 305 /* rs6000.h gets this wrong for FreeBSD.  We use the GCC defaults instead.  */
 306 #undef WCHAR_TYPE
 307 #define WCHAR_TYPE      (TARGET_64BIT ? "int" : "long int")
 308 #undef  WCHAR_TYPE_SIZE
 309 #define WCHAR_TYPE_SIZE 32
 310
 311
 312 /* Override rs6000.h definition.  */
 313 #undef  ASM_APP_ON
 314 #define ASM_APP_ON "#APP\n"
 315
 316 /* Override rs6000.h definition.  */
 317 #undef  ASM_APP_OFF
 318 #define ASM_APP_OFF "#NO_APP\n"
 319
 320 /* Function profiling bits */
 321 #undef  RS6000_MCOUNT
 322 #define RS6000_MCOUNT "_mcount"
 323
 324 #define PROFILE_HOOK(LABEL) \
 325   do { if (TARGET_64BIT) output_profile_hook (LABEL); } while (0)
 326
 327 /* _init and _fini functions are built from bits spread across many
 328    object files, each potentially with a different TOC pointer.  For
 329    that reason, place a nop after the call so that the linker can
 330    restore the TOC pointer if a TOC adjusting call stub is needed.  */
 331 #ifdef __powerpc64__
 332 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 333   asm (SECTION_OP "\n"                                  \
 334 "       bl " #FUNC "\n"                                 \
 335 "       nop\n"                                          \
 336 "       .previous");
 337 #endif
 338
 339 /* FP save and restore routines.  */
 340 #undef  SAVE_FP_PREFIX
 341 #define SAVE_FP_PREFIX (TARGET_64BIT ? "._savef" : "_savefpr_")
 342 #undef  SAVE_FP_SUFFIX
 343 #define SAVE_FP_SUFFIX ""
 344 #undef  RESTORE_FP_PREFIX
 345 #define RESTORE_FP_PREFIX (TARGET_64BIT ? "._restf" : "_restfpr_")
 346 #undef  RESTORE_FP_SUFFIX
 347 #define RESTORE_FP_SUFFIX ""
 348
 349 /* Select a format to encode pointers in exception handling data.  CODE
 350    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
 351    true if the symbol may be affected by dynamic relocations.  */
 352 #undef  ASM_PREFERRED_EH_DATA_FORMAT
 353 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 354   ((TARGET_64BIT || flag_pic || TARGET_RELOCATABLE)                     \
 355    ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel               \
 356       | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4))             \
 357    : DW_EH_PE_absptr)
 358
 359 /* Static stack checking is supported by means of probes.  */
 360 #define STACK_CHECK_STATIC_BUILTIN 1
 361
 362 /* The default value isn't sufficient in 64-bit mode.  */
 363 #define STACK_CHECK_PROTECT (TARGET_64BIT ? 16 * 1024 : 12 * 1024)
 364
 365 #define DBX_REGISTER_NUMBER(REGNO) rs6000_dbx_register_number (REGNO)
 366
 367 /* PowerPC64 Linux word-aligns FP doubles when -malign-power is given.  */
 368 #undef  ADJUST_FIELD_ALIGN
 369 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
 370   ((TARGET_ALTIVEC && TREE_CODE (TREE_TYPE (FIELD)) == VECTOR_TYPE)     \
 371    ? 128                                                                \
 372    : (TARGET_64BIT                                                      \
 373       && TARGET_ALIGN_NATURAL == 0                                      \
 374       && TYPE_MODE (strip_array_types (TREE_TYPE (FIELD))) == DFmode)   \
 375    ? MIN ((COMPUTED), 32)                                               \
 376    : (COMPUTED))
 377
 378 #undef  TOC_SECTION_ASM_OP
 379 #define TOC_SECTION_ASM_OP \
 380   (TARGET_64BIT                                         \
 381    ? "\t.section\t\".toc\",\"aw\""                      \
 382    : "\t.section\t\".got\",\"aw\"")
 383
 384 #undef  MINIMAL_TOC_SECTION_ASM_OP
 385 #define MINIMAL_TOC_SECTION_ASM_OP \
 386   (TARGET_64BIT                                         \
 387    ? "\t.section\t\".toc1\",\"aw\""                     \
 388    : ((TARGET_RELOCATABLE || flag_pic)                  \
 389       ? "\t.section\t\".got2\",\"aw\""                  \
 390       : "\t.section\t\".got1\",\"aw\""))
 391
 392 /* This is how to declare the size of a function.  */
 393 #undef  ASM_DECLARE_FUNCTION_SIZE
 394 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 395   do                                                                    \
 396     {                                                                   \
 397       if (!flag_inhibit_size_directive)                                 \
 398         {                                                               \
 399           fputs ("\t.size\t", (FILE));                                  \
 400           if (TARGET_64BIT && DOT_SYMBOLS)                              \
 401             putc ('.', (FILE));                                         \
 402           assemble_name ((FILE), (FNAME));                              \
 403           fputs (",.-", (FILE));                                        \
 404           rs6000_output_function_entry (FILE, FNAME);                   \
 405           putc ('\n', (FILE));                                          \
 406         }                                                               \
 407     }                                                                   \
 408   while (0)
 409
 410 #undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
 411 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
 412   (TARGET_TOC                                                           \
 413    && (GET_CODE (X) == SYMBOL_REF                                       \
 414        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
 415            && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)           \
 416        || GET_CODE (X) == LABEL_REF                                     \
 417        || (GET_CODE (X) == CONST_INT                                    \
 418            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
 419        || (GET_CODE (X) == CONST_DOUBLE                                 \
 420            && ((TARGET_64BIT                                            \
 421                 && (TARGET_MINIMAL_TOC                                  \
 422                     || (SCALAR_FLOAT_MODE_P (GET_MODE (X))              \
 423                         && ! TARGET_NO_FP_IN_TOC)))                     \
 424                || (!TARGET_64BIT                                        \
 425                    && !TARGET_NO_FP_IN_TOC                              \
 426                    && !TARGET_RELOCATABLE                               \
 427                    && SCALAR_FLOAT_MODE_P (GET_MODE (X))                \
 428                    && BITS_PER_WORD == HOST_BITS_PER_INT)))))
 429
 430 /* Use --as-needed -lgcc_s for eh support.  */
 431 #ifdef HAVE_LD_AS_NEEDED
 432 #define USE_LD_AS_NEEDED 1
 433 #endif
 434
 435 #define POWERPC_FREEBSD