gcc/config/rs6000/freebsd64.h

   1 /* Definitions for 64-bit PowerPC running FreeBSD using the ELF format
   2    Copyright (C) 2012-2018 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 LINK_OS_FREEBSD_SPEC_DEF "\
 171   %{p:%nconsider using `-pg' instead of `-p' with gprof(1)} \
 172   %{v:-V} \
 173   %{assert*} %{R*} %{rpath*} %{defsym*} \
 174   %{shared:-Bshareable %{h*} %{soname*}} \
 175   %{!shared: \
 176     %{!static: \
 177       %{rdynamic: -export-dynamic} \
 178       %{!dynamic-linker:-dynamic-linker " FBSD_DYNAMIC_LINKER "}} \
 179     %{static:-Bstatic}} \
 180   %{symbolic:-Bsymbolic}"
 181
 182 #define LINK_OS_FREEBSD_SPEC32 "-melf32ppc_fbsd " LINK_OS_FREEBSD_SPEC_DEF
 183
 184 #define LINK_OS_FREEBSD_SPEC64 "-melf64ppc_fbsd " LINK_OS_FREEBSD_SPEC_DEF
 185
 186 #undef  MULTILIB_DEFAULTS
 187 #define MULTILIB_DEFAULTS { "m64" }
 188
 189 /* PowerPC-64 FreeBSD increases natural record alignment to doubleword if
 190    the first field is an FP double, only if in power alignment mode.  */
 191 #undef  ROUND_TYPE_ALIGN
 192 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                   \
 193   ((TARGET_64BIT                                                        \
 194     && (TREE_CODE (STRUCT) == RECORD_TYPE                               \
 195         || TREE_CODE (STRUCT) == UNION_TYPE                             \
 196         || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                       \
 197     && TARGET_ALIGN_NATURAL == 0)                                       \
 198    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)      \
 199    : MAX ((COMPUTED), (SPECIFIED)))
 200
 201 /* Use the default for compiling target libs.  */
 202 #ifdef IN_TARGET_LIBS
 203 #undef TARGET_ALIGN_NATURAL
 204 #define TARGET_ALIGN_NATURAL 1
 205 #endif
 206
 207 /* Indicate that jump tables go in the text section.  */
 208 #undef  JUMP_TABLES_IN_TEXT_SECTION
 209 #define JUMP_TABLES_IN_TEXT_SECTION TARGET_64BIT
 210
 211 /* The linux ppc64 ABI isn't explicit on whether aggregates smaller
 212    than a doubleword should be padded upward or downward.  You could
 213    reasonably assume that they follow the normal rules for structure
 214    layout treating the parameter area as any other block of memory,
 215    then map the reg param area to registers.  i.e. pad upward.
 216    Setting both of the following defines results in this behavior.
 217    Setting just the first one will result in aggregates that fit in a
 218    doubleword being padded downward, and others being padded upward.
 219    Not a bad idea as this results in struct { int x; } being passed
 220    the same way as an int.  */
 221 #define AGGREGATE_PADDING_FIXED TARGET_64BIT
 222 #define AGGREGATES_PAD_UPWARD_ALWAYS 0
 223
 224 /* Specify padding for the last element of a block move between
 225    registers and memory.  FIRST is nonzero if this is the only
 226    element.  */
 227 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 228   (!(FIRST) ? PAD_UPWARD : targetm.calls.function_arg_padding (MODE, TYPE))
 229
 230 /* FreeBSD doesn't support saving and restoring 64-bit regs with a 32-bit
 231    kernel. This is supported when running on a 64-bit kernel with
 232    COMPAT_FREEBSD32, but tell GCC it isn't so that our 32-bit binaries
 233    are compatible. */
 234 #define OS_MISSING_POWERPC64 !TARGET_64BIT
 235
 236 #undef  FBSD_TARGET_CPU_CPP_BUILTINS
 237 #define FBSD_TARGET_CPU_CPP_BUILTINS()                  \
 238   do                                                    \
 239     {                                                   \
 240       builtin_define ("__PPC__");                       \
 241       builtin_define ("__ppc__");                       \
 242       builtin_define ("__powerpc__");                   \
 243       if (TARGET_64BIT)                                 \
 244         {                                               \
 245           builtin_define ("__arch64__");                \
 246           builtin_define ("__LP64__");                  \
 247           builtin_define ("__PPC64__");                 \
 248           builtin_define ("__powerpc64__");             \
 249           builtin_assert ("cpu=powerpc64");             \
 250           builtin_assert ("machine=powerpc64");         \
 251         }                                               \
 252       else                                              \
 253         {                                               \
 254           builtin_define_std ("PPC");                   \
 255           builtin_define_std ("powerpc");               \
 256           builtin_assert ("cpu=powerpc");               \
 257           builtin_assert ("machine=powerpc");           \
 258           TARGET_OS_SYSV_CPP_BUILTINS ();               \
 259         }                                               \
 260     }                                                   \
 261   while (0)
 262
 263 #undef  CPP_OS_DEFAULT_SPEC
 264 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_freebsd)"
 265
 266 #undef CPP_OS_FREEBSD_SPEC
 267 #define CPP_OS_FREEBSD_SPEC ""
 268
 269 #undef  STARTFILE_DEFAULT_SPEC
 270 #define STARTFILE_DEFAULT_SPEC "%(startfile_freebsd)"
 271
 272 #undef  ENDFILE_DEFAULT_SPEC
 273 #define ENDFILE_DEFAULT_SPEC "%(endfile_freebsd)"
 274
 275 #undef  LIB_DEFAULT_SPEC
 276 #define LIB_DEFAULT_SPEC "%(lib_freebsd)"
 277
 278 #undef  LINK_START_DEFAULT_SPEC
 279 #define LINK_START_DEFAULT_SPEC "%(link_start_freebsd)"
 280
 281 #undef  LINK_OS_DEFAULT_SPEC
 282 #define LINK_OS_DEFAULT_SPEC "%(link_os_freebsd)"
 283
 284 /* XXX: This is wrong for many platforms in sysv4.h.
 285    We should work on getting that definition fixed.  */
 286 #undef  LINK_SHLIB_SPEC
 287 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
 288
 289
 290 /************************[  Target stuff  ]***********************************/
 291
 292 /* Define the actual types of some ANSI-mandated types.
 293    Needs to agree with <machine/ansi.h>.  GCC defaults come from c-decl.c,
 294    c-common.c, and config/<arch>/<arch>.h.  */
 295
 296
 297 #undef  SIZE_TYPE
 298 #define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int")
 299
 300 #undef  PTRDIFF_TYPE
 301 #define PTRDIFF_TYPE    (TARGET_64BIT ? "long int" : "int")
 302
 303 /* rs6000.h gets this wrong for FreeBSD.  We use the GCC defaults instead.  */
 304 #undef WCHAR_TYPE
 305
 306 #undef  WCHAR_TYPE_SIZE
 307 #define WCHAR_TYPE_SIZE 32
 308
 309
 310 /* Override rs6000.h definition.  */
 311 #undef  ASM_APP_ON
 312 #define ASM_APP_ON "#APP\n"
 313
 314 /* Override rs6000.h definition.  */
 315 #undef  ASM_APP_OFF
 316 #define ASM_APP_OFF "#NO_APP\n"
 317
 318 /* Function profiling bits */
 319 #undef  RS6000_MCOUNT
 320 #define RS6000_MCOUNT "_mcount"
 321
 322 #define PROFILE_HOOK(LABEL) \
 323   do { if (TARGET_64BIT) output_profile_hook (LABEL); } while (0)
 324
 325 /* _init and _fini functions are built from bits spread across many
 326    object files, each potentially with a different TOC pointer.  For
 327    that reason, place a nop after the call so that the linker can
 328    restore the TOC pointer if a TOC adjusting call stub is needed.  */
 329 #ifdef __powerpc64__
 330 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 331   asm (SECTION_OP "\n"                                  \
 332 "       bl " #FUNC "\n"                                 \
 333 "       nop\n"                                          \
 334 "       .previous");
 335 #endif
 336
 337 /* FP save and restore routines.  */
 338 #undef  SAVE_FP_PREFIX
 339 #define SAVE_FP_PREFIX (TARGET_64BIT ? "._savef" : "_savefpr_")
 340 #undef  SAVE_FP_SUFFIX
 341 #define SAVE_FP_SUFFIX ""
 342 #undef  RESTORE_FP_PREFIX
 343 #define RESTORE_FP_PREFIX (TARGET_64BIT ? "._restf" : "_restfpr_")
 344 #undef  RESTORE_FP_SUFFIX
 345 #define RESTORE_FP_SUFFIX ""
 346
 347 /* Select a format to encode pointers in exception handling data.  CODE
 348    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
 349    true if the symbol may be affected by dynamic relocations.  */
 350 #undef  ASM_PREFERRED_EH_DATA_FORMAT
 351 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 352   (TARGET_64BIT || flag_pic                                             \
 353    ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel               \
 354       | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4))             \
 355    : DW_EH_PE_absptr)
 356
 357 /* Static stack checking is supported by means of probes.  */
 358 #define STACK_CHECK_STATIC_BUILTIN 1
 359
 360 /* The default value isn't sufficient in 64-bit mode.  */
 361 #define STACK_CHECK_PROTECT (TARGET_64BIT ? 16 * 1024 : 12 * 1024)
 362
 363 /* Use standard DWARF numbering for DWARF debugging information.  */
 364 #define RS6000_USE_DWARF_NUMBERING
 365
 366 /* PowerPC64 Linux word-aligns FP doubles when -malign-power is given.  */
 367 #undef  ADJUST_FIELD_ALIGN
 368 #define ADJUST_FIELD_ALIGN(FIELD, TYPE, COMPUTED) \
 369   (rs6000_special_adjust_field_align_p ((TYPE), (COMPUTED))             \
 370    ? 128                                                                \
 371    : (TARGET_64BIT                                                      \
 372       && TARGET_ALIGN_NATURAL == 0                                      \
 373       && TYPE_MODE (strip_array_types (TYPE)) == 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    : (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                    && SCALAR_FLOAT_MODE_P (GET_MODE (X))                \
 426                    && BITS_PER_WORD == HOST_BITS_PER_INT)))))
 427
 428 /* Use --as-needed -lgcc_s for eh support.  */
 429 #ifdef HAVE_LD_AS_NEEDED
 430 #define USE_LD_AS_NEEDED 1
 431 #endif
 432
 433 #define POWERPC_FREEBSD