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   (target_flags & target_flags_explicit & 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 (target_flags & MASK_RELOCATABLE)                  \
  83             {                                                   \
  84               target_flags &= ~MASK_RELOCATABLE;                \
  85               error (INVALID_64BIT, "relocatable");             \
  86             }                                                   \
  87           if (target_flags & MASK_EABI)                         \
  88             {                                                   \
  89               target_flags &= ~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 ((target_flags & MASK_POWERPC64) == 0)             \
  98             {                                                   \
  99               target_flags |= MASK_POWERPC64;                   \
 100               error ("-m64 requires a PowerPC64 cpu");          \
 101             }                                                   \
 102            if ((target_flags_explicit & MASK_MINIMAL_TOC) != 0) \
 103             {                                                   \
 104               if (global_options_set.x_rs6000_current_cmodel    \
 105                   && rs6000_current_cmodel != CMODEL_SMALL)     \
 106                 error ("-mcmodel incompatible with other toc options"); \
 107               SET_CMODEL (CMODEL_SMALL);                        \
 108             }                                                   \
 109           else                                                  \
 110             {                                                   \
 111               if (!global_options_set.x_rs6000_current_cmodel)  \
 112                 SET_CMODEL (CMODEL_MEDIUM);                     \
 113               if (rs6000_current_cmodel != CMODEL_SMALL)        \
 114                 {                                               \
 115                   TARGET_NO_FP_IN_TOC = 0;                      \
 116                   TARGET_NO_SUM_IN_TOC = 0;                     \
 117                 }                                               \
 118             }                                                   \
 119         }                                                       \
 120     }                                                           \
 121   while (0)
 122
 123 #undef  ASM_DEFAULT_SPEC
 124 #undef  ASM_SPEC
 125 #undef  LINK_OS_FREEBSD_SPEC
 126
 127 #define ASM_DEFAULT_SPEC "-mppc%{!m32:64}"
 128 #define ASM_SPEC         "%{m32:%(asm_spec32)}%{!m32:%(asm_spec64)} %(asm_spec_common)"
 129 #define LINK_OS_FREEBSD_SPEC "%{m32:%(link_os_freebsd_spec32)}%{!m32:%(link_os_freebsd_spec64)}"
 130
 131 #define ASM_SPEC32 "-a32 \
 132 %{mrelocatable} %{mrelocatable-lib} %{fpic:-K PIC} %{fPIC:-K PIC} \
 133 %{memb} %{!memb: %{msdata=eabi: -memb}} \
 134 %{!mlittle: %{!mlittle-endian: %{!mbig: %{!mbig-endian: \
 135     %{mcall-freebsd: -mbig} \
 136     %{mcall-i960-old: -mlittle} \
 137     %{mcall-linux: -mbig} \
 138     %{mcall-gnu: -mbig} \
 139     %{mcall-netbsd: -mbig} \
 140 }}}}"
 141
 142 #define ASM_SPEC64 "-a64"
 143
 144 #define ASM_SPEC_COMMON "%(asm_cpu) \
 145 %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}} \
 146 %{mlittle} %{mlittle-endian} %{mbig} %{mbig-endian}"
 147
 148 #undef  SUBSUBTARGET_EXTRA_SPECS
 149 #define SUBSUBTARGET_EXTRA_SPECS                                        \
 150   { "asm_spec_common",          ASM_SPEC_COMMON },                      \
 151   { "asm_spec32",               ASM_SPEC32 },                           \
 152   { "asm_spec64",               ASM_SPEC64 },                           \
 153   { "link_os_freebsd_spec32",   LINK_OS_FREEBSD_SPEC32 },               \
 154   { "link_os_freebsd_spec64",   LINK_OS_FREEBSD_SPEC64 },
 155
 156 #define FREEBSD_DYNAMIC_LINKER32 "/libexec/ld-elf32.so.1"
 157 #define FREEBSD_DYNAMIC_LINKER64 "/libexec/ld-elf.so.1"
 158
 159 #define LINK_OS_FREEBSD_SPEC_DEF32 "\
 160   %{p:%nconsider using `-pg' instead of `-p' with gprof(1)} \
 161   %{v:-V} \
 162   %{assert*} %{R*} %{rpath*} %{defsym*} \
 163   %{shared:-Bshareable %{h*} %{soname*}} \
 164   %{!shared: \
 165     %{!static: \
 166       %{rdynamic: -export-dynamic} \
 167       %{!dynamic-linker:-dynamic-linker " FREEBSD_DYNAMIC_LINKER32 "}} \
 168     %{static:-Bstatic}} \
 169   %{symbolic:-Bsymbolic}"
 170
 171 #define LINK_OS_FREEBSD_SPEC_DEF64 "\
 172   %{p:%nconsider using `-pg' instead of `-p' with gprof(1)} \
 173   %{v:-V} \
 174   %{assert*} %{R*} %{rpath*} %{defsym*} \
 175   %{shared:-Bshareable %{h*} %{soname*}} \
 176   %{!shared: \
 177     %{!static: \
 178       %{rdynamic: -export-dynamic} \
 179       %{!dynamic-linker:-dynamic-linker " FREEBSD_DYNAMIC_LINKER64 "}} \
 180     %{static:-Bstatic}} \
 181   %{symbolic:-Bsymbolic}"
 182
 183 #define LINK_OS_FREEBSD_SPEC32 "-melf32ppc_fbsd " LINK_OS_FREEBSD_SPEC_DEF32
 184
 185 #define LINK_OS_FREEBSD_SPEC64 "-melf64ppc_fbsd " LINK_OS_FREEBSD_SPEC_DEF64
 186
 187 #undef  MULTILIB_DEFAULTS
 188 #define MULTILIB_DEFAULTS { "m64" }
 189
 190 /* PowerPC-64 FreeBSD increases natural record alignment to doubleword if
 191    the first field is an FP double, only if in power alignment mode.  */
 192 #undef  ROUND_TYPE_ALIGN
 193 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                   \
 194   ((TARGET_64BIT                                                        \
 195     && (TREE_CODE (STRUCT) == RECORD_TYPE                               \
 196         || TREE_CODE (STRUCT) == UNION_TYPE                             \
 197         || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                       \
 198     && TARGET_ALIGN_NATURAL == 0)                                       \
 199    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)      \
 200    : MAX ((COMPUTED), (SPECIFIED)))
 201
 202 /* Use the default for compiling target libs.  */
 203 #ifdef IN_TARGET_LIBS
 204 #undef TARGET_ALIGN_NATURAL
 205 #define TARGET_ALIGN_NATURAL 1
 206 #endif
 207
 208 /* Indicate that jump tables go in the text section.  */
 209 #undef  JUMP_TABLES_IN_TEXT_SECTION
 210 #define JUMP_TABLES_IN_TEXT_SECTION TARGET_64BIT
 211
 212 /* The linux ppc64 ABI isn't explicit on whether aggregates smaller
 213    than a doubleword should be padded upward or downward.  You could
 214    reasonably assume that they follow the normal rules for structure
 215    layout treating the parameter area as any other block of memory,
 216    then map the reg param area to registers.  i.e. pad upward.
 217    Setting both of the following defines results in this behavior.
 218    Setting just the first one will result in aggregates that fit in a
 219    doubleword being padded downward, and others being padded upward.
 220    Not a bad idea as this results in struct { int x; } being passed
 221    the same way as an int.  */
 222 #define AGGREGATE_PADDING_FIXED TARGET_64BIT
 223 #define AGGREGATES_PAD_UPWARD_ALWAYS 0
 224
 225 /* Specify padding for the last element of a block move between
 226    registers and memory.  FIRST is nonzero if this is the only
 227    element.  */
 228 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 229   (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
 230
 231 /* FreeBSD doesn't support saving and restoring 64-bit regs with a 32-bit
 232    kernel. This is supported when running on a 64-bit kernel with
 233    COMPAT_FREEBSD32, but tell GCC it isn't so that our 32-bit binaries
 234    are compatible. */
 235 #define OS_MISSING_POWERPC64 !TARGET_64BIT
 236
 237 #undef  FBSD_TARGET_CPU_CPP_BUILTINS
 238 #define FBSD_TARGET_CPU_CPP_BUILTINS()                  \
 239   do                                                    \
 240     {                                                   \
 241       builtin_define ("__PPC__");                       \
 242       builtin_define ("__ppc__");                       \
 243       builtin_define ("__powerpc__");                   \
 244       if (TARGET_64BIT)                                 \
 245         {                                               \
 246           builtin_define ("__arch64__");                \
 247           builtin_define ("__LP64__");                  \
 248           builtin_define ("__PPC64__");                 \
 249           builtin_define ("__powerpc64__");             \
 250           builtin_assert ("cpu=powerpc64");             \
 251           builtin_assert ("machine=powerpc64");         \
 252         }                                               \
 253       else                                              \
 254         {                                               \
 255           builtin_define_std ("PPC");                   \
 256           builtin_define_std ("powerpc");               \
 257           builtin_assert ("cpu=powerpc");               \
 258           builtin_assert ("machine=powerpc");           \
 259           TARGET_OS_SYSV_CPP_BUILTINS ();               \
 260         }                                               \
 261     }                                                   \
 262   while (0)
 263
 264 #undef  CPP_OS_DEFAULT_SPEC
 265 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_freebsd)"
 266
 267 #undef CPP_OS_FREEBSD_SPEC
 268 #define CPP_OS_FREEBSD_SPEC ""
 269
 270 #undef  STARTFILE_DEFAULT_SPEC
 271 #define STARTFILE_DEFAULT_SPEC "%(startfile_freebsd)"
 272
 273 #undef  ENDFILE_DEFAULT_SPEC
 274 #define ENDFILE_DEFAULT_SPEC "%(endfile_freebsd)"
 275
 276 #undef  LIB_DEFAULT_SPEC
 277 #define LIB_DEFAULT_SPEC "%(lib_freebsd)"
 278
 279 #undef  LINK_START_DEFAULT_SPEC
 280 #define LINK_START_DEFAULT_SPEC "%(link_start_freebsd)"
 281
 282 #undef  LINK_OS_DEFAULT_SPEC
 283 #define LINK_OS_DEFAULT_SPEC "%(link_os_freebsd)"
 284
 285 /* XXX: This is wrong for many platforms in sysv4.h.
 286    We should work on getting that definition fixed.  */
 287 #undef  LINK_SHLIB_SPEC
 288 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
 289
 290
 291 /************************[  Target stuff  ]***********************************/
 292
 293 /* Define the actual types of some ANSI-mandated types.
 294    Needs to agree with <machine/ansi.h>.  GCC defaults come from c-decl.c,
 295    c-common.c, and config/<arch>/<arch>.h.  */
 296
 297
 298 #undef  SIZE_TYPE
 299 #define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int")
 300
 301 #undef  PTRDIFF_TYPE
 302 #define PTRDIFF_TYPE    (TARGET_64BIT ? "long int" : "int")
 303
 304 /* rs6000.h gets this wrong for FreeBSD.  We use the GCC defaults instead.  */
 305 #undef WCHAR_TYPE
 306 #define WCHAR_TYPE      (TARGET_64BIT ? "int" : "long int")
 307 #undef  WCHAR_TYPE_SIZE
 308 #define WCHAR_TYPE_SIZE 32
 309
 310
 311 /* Override rs6000.h definition.  */
 312 #undef  ASM_APP_ON
 313 #define ASM_APP_ON "#APP\n"
 314
 315 /* Override rs6000.h definition.  */
 316 #undef  ASM_APP_OFF
 317 #define ASM_APP_OFF "#NO_APP\n"
 318
 319 /* Function profiling bits */
 320 #undef  RS6000_MCOUNT
 321 #define RS6000_MCOUNT "_mcount"
 322
 323 #define PROFILE_HOOK(LABEL) \
 324   do { if (TARGET_64BIT) output_profile_hook (LABEL); } while (0)
 325
 326 /* _init and _fini functions are built from bits spread across many
 327    object files, each potentially with a different TOC pointer.  For
 328    that reason, place a nop after the call so that the linker can
 329    restore the TOC pointer if a TOC adjusting call stub is needed.  */
 330 #ifdef __powerpc64__
 331 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 332   asm (SECTION_OP "\n"                                  \
 333 "       bl " #FUNC "\n"                                 \
 334 "       nop\n"                                          \
 335 "       .previous");
 336 #endif
 337
 338 /* FP save and restore routines.  */
 339 #undef  SAVE_FP_PREFIX
 340 #define SAVE_FP_PREFIX (TARGET_64BIT ? "._savef" : "_savefpr_")
 341 #undef  SAVE_FP_SUFFIX
 342 #define SAVE_FP_SUFFIX ""
 343 #undef  RESTORE_FP_PREFIX
 344 #define RESTORE_FP_PREFIX (TARGET_64BIT ? "._restf" : "_restfpr_")
 345 #undef  RESTORE_FP_SUFFIX
 346 #define RESTORE_FP_SUFFIX ""
 347
 348 /* Select a format to encode pointers in exception handling data.  CODE
 349    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
 350    true if the symbol may be affected by dynamic relocations.  */
 351 #undef  ASM_PREFERRED_EH_DATA_FORMAT
 352 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 353   ((TARGET_64BIT || flag_pic || TARGET_RELOCATABLE)                     \
 354    ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel               \
 355       | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4))             \
 356    : DW_EH_PE_absptr)
 357
 358 /* Static stack checking is supported by means of probes.  */
 359 #define STACK_CHECK_STATIC_BUILTIN 1
 360
 361 /* The default value isn't sufficient in 64-bit mode.  */
 362 #define STACK_CHECK_PROTECT (TARGET_64BIT ? 16 * 1024 : 12 * 1024)
 363
 364 #define DBX_REGISTER_NUMBER(REGNO) rs6000_dbx_register_number (REGNO)
 365
 366 /* PowerPC64 Linux word-aligns FP doubles when -malign-power is given.  */
 367 #undef  ADJUST_FIELD_ALIGN
 368 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
 369   ((TARGET_ALTIVEC && TREE_CODE (TREE_TYPE (FIELD)) == VECTOR_TYPE)     \
 370    ? 128                                                                \
 371    : (TARGET_64BIT                                                      \
 372       && TARGET_ALIGN_NATURAL == 0                                      \
 373       && TYPE_MODE (strip_array_types (TREE_TYPE (FIELD))) == DFmode)   \
 374    ? MIN ((COMPUTED), 32)                                               \
 375    : (COMPUTED))
 376
 377 #undef  TOC_SECTION_ASM_OP
 378 #define TOC_SECTION_ASM_OP \
 379   (TARGET_64BIT                                         \
 380    ? "\t.section\t\".toc\",\"aw\""                      \
 381    : "\t.section\t\".got\",\"aw\"")
 382
 383 #undef  MINIMAL_TOC_SECTION_ASM_OP
 384 #define MINIMAL_TOC_SECTION_ASM_OP \
 385   (TARGET_64BIT                                         \
 386    ? "\t.section\t\".toc1\",\"aw\""                     \
 387    : ((TARGET_RELOCATABLE || flag_pic)                  \
 388       ? "\t.section\t\".got2\",\"aw\""                  \
 389       : "\t.section\t\".got1\",\"aw\""))
 390
 391 /* This is how to declare the size of a function.  */
 392 #undef  ASM_DECLARE_FUNCTION_SIZE
 393 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 394   do                                                                    \
 395     {                                                                   \
 396       if (!flag_inhibit_size_directive)                                 \
 397         {                                                               \
 398           fputs ("\t.size\t", (FILE));                                  \
 399           if (TARGET_64BIT && DOT_SYMBOLS)                              \
 400             putc ('.', (FILE));                                         \
 401           assemble_name ((FILE), (FNAME));                              \
 402           fputs (",.-", (FILE));                                        \
 403           rs6000_output_function_entry (FILE, FNAME);                   \
 404           putc ('\n', (FILE));                                          \
 405         }                                                               \
 406     }                                                                   \
 407   while (0)
 408
 409 #undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
 410 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
 411   (TARGET_TOC                                                           \
 412    && (GET_CODE (X) == SYMBOL_REF                                       \
 413        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
 414            && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)           \
 415        || GET_CODE (X) == LABEL_REF                                     \
 416        || (GET_CODE (X) == CONST_INT                                    \
 417            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
 418        || (GET_CODE (X) == CONST_DOUBLE                                 \
 419            && ((TARGET_64BIT                                            \
 420                 && (TARGET_MINIMAL_TOC                                  \
 421                     || (SCALAR_FLOAT_MODE_P (GET_MODE (X))              \
 422                         && ! TARGET_NO_FP_IN_TOC)))                     \
 423                || (!TARGET_64BIT                                        \
 424                    && !TARGET_NO_FP_IN_TOC                              \
 425                    && !TARGET_RELOCATABLE                               \
 426                    && SCALAR_FLOAT_MODE_P (GET_MODE (X))                \
 427                    && BITS_PER_WORD == HOST_BITS_PER_INT)))))
 428
 429 /* Use --as-needed -lgcc_s for eh support.  */
 430 #ifdef HAVE_LD_AS_NEEDED
 431 #define USE_LD_AS_NEEDED 1
 432 #endif
 433
 434 #define POWERPC_FREEBSD