gcc/config/rs6000/freebsd64.h

   1 /* Definitions for 64-bit PowerPC running FreeBSD using the ELF format
   2    Copyright (C) 2012-2020 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 /* Undef gnu-user.h macros we don't want.  */
  21 #undef CPLUSPLUS_CPP_SPEC
  22 #undef LINK_GCC_C_SEQUENCE_SPEC
  23
  24 /* Override the defaults, which exist to force the proper definition.  */
  25
  26 #ifdef IN_LIBGCC2
  27 #undef TARGET_64BIT
  28 #ifdef __powerpc64__
  29 #define TARGET_64BIT 1
  30 #else
  31 #define TARGET_64BIT 0
  32 #endif
  33 #endif
  34
  35 #undef  TARGET_AIX
  36 #define TARGET_AIX TARGET_64BIT
  37
  38 #ifdef HAVE_LD_NO_DOT_SYMS
  39 /* New ABI uses a local sym for the function entry point.  */
  40 extern int dot_symbols;
  41 #undef DOT_SYMBOLS
  42 #define DOT_SYMBOLS dot_symbols
  43 #endif
  44
  45 #define TARGET_USES_LINUX64_OPT 1
  46 #ifdef HAVE_LD_LARGE_TOC
  47 #undef TARGET_CMODEL
  48 #define TARGET_CMODEL rs6000_current_cmodel
  49 #define SET_CMODEL(opt) rs6000_current_cmodel = opt
  50 #else
  51 #define SET_CMODEL(opt) do {} while (0)
  52 #endif
  53
  54 /* Until now the 970 is the only Processor where FreeBSD 64-bit runs on.  */
  55 #undef  PROCESSOR_DEFAULT
  56 #define PROCESSOR_DEFAULT PROCESSOR_POWER4
  57 #undef  PROCESSOR_DEFAULT64
  58 #define PROCESSOR_DEFAULT64 PROCESSOR_POWER4
  59
  60 /* We don't need to generate entries in .fixup, except when
  61    -mrelocatable or -mrelocatable-lib is given.  */
  62 #undef RELOCATABLE_NEEDS_FIXUP
  63 #define RELOCATABLE_NEEDS_FIXUP \
  64   (rs6000_isa_flags & rs6000_isa_flags_explicit & OPTION_MASK_RELOCATABLE)
  65
  66 #undef  RS6000_ABI_NAME
  67 #define RS6000_ABI_NAME "freebsd"
  68
  69 #define INVALID_64BIT "-m%s not supported in this configuration"
  70 #define INVALID_32BIT INVALID_64BIT
  71
  72 /* Use LINUX64 instead of FREEBSD64 for compat with e.g. sysv4le.h */
  73 #ifdef LINUX64_DEFAULT_ABI_ELFv2
  74 #define ELFv2_ABI_CHECK (rs6000_elf_abi != 1)
  75 #else
  76 #define ELFv2_ABI_CHECK (rs6000_elf_abi == 2)
  77 #endif
  78
  79 #undef  SUBSUBTARGET_OVERRIDE_OPTIONS
  80 #define SUBSUBTARGET_OVERRIDE_OPTIONS                           \
  81   do                                                            \
  82     {                                                           \
  83       if (!global_options_set.x_rs6000_alignment_flags)         \
  84         rs6000_alignment_flags = MASK_ALIGN_NATURAL;            \
  85       if (TARGET_64BIT)                                         \
  86         {                                                       \
  87           if (DEFAULT_ABI != ABI_AIX)                           \
  88             {                                                   \
  89               rs6000_current_abi = ABI_AIX;                     \
  90               error (INVALID_64BIT, "call");                    \
  91             }                                                   \
  92           dot_symbols = !strcmp (rs6000_abi_name, "aixdesc");   \
  93           if (rs6000_isa_flags & OPTION_MASK_RELOCATABLE)       \
  94             {                                                   \
  95               rs6000_isa_flags &= ~OPTION_MASK_RELOCATABLE;     \
  96               error (INVALID_64BIT, "relocatable");             \
  97             }                                                   \
  98           if (ELFv2_ABI_CHECK)                                  \
  99             {                                                   \
 100               rs6000_current_abi = ABI_ELFv2;                   \
 101               if (dot_symbols)                                  \
 102                 error ("%<-mcall-aixdesc%> incompatible with %<-mabi=elfv2%>"); \
 103             }                                                   \
 104           if (rs6000_isa_flags & OPTION_MASK_EABI)              \
 105             {                                                   \
 106               rs6000_isa_flags &= ~OPTION_MASK_EABI;            \
 107               error (INVALID_64BIT, "eabi");                    \
 108             }                                                   \
 109           if (TARGET_PROTOTYPE)                                 \
 110             {                                                   \
 111               target_prototype = 0;                             \
 112               error (INVALID_64BIT, "prototype");               \
 113             }                                                   \
 114           if ((rs6000_isa_flags & OPTION_MASK_POWERPC64) == 0)  \
 115             {                                                   \
 116               rs6000_isa_flags |= OPTION_MASK_POWERPC64;        \
 117               error ("%<-m64%> requires a PowerPC64 cpu");              \
 118             }                                                   \
 119            if ((rs6000_isa_flags_explicit                       \
 120                 & OPTION_MASK_MINIMAL_TOC) != 0)                \
 121             {                                                   \
 122               if (global_options_set.x_rs6000_current_cmodel    \
 123                   && rs6000_current_cmodel != CMODEL_SMALL)     \
 124                 error ("%<-mcmodel%> incompatible with other toc options"); \
 125               SET_CMODEL (CMODEL_SMALL);                        \
 126             }                                                   \
 127           else                                                  \
 128             {                                                   \
 129               if (!global_options_set.x_rs6000_current_cmodel)  \
 130                 SET_CMODEL (CMODEL_MEDIUM);                     \
 131               if (rs6000_current_cmodel != CMODEL_SMALL)        \
 132                 {                                               \
 133                   TARGET_NO_FP_IN_TOC = 0;                      \
 134                   TARGET_NO_SUM_IN_TOC = 0;                     \
 135                 }                                               \
 136             }                                                   \
 137         }                                                       \
 138     }                                                           \
 139   while (0)
 140
 141 #undef  ASM_SPEC
 142 #undef  LINK_OS_FREEBSD_SPEC
 143
 144 #define ASM_SPEC         "%{m32:%(asm_spec32)}%{!m32:%(asm_spec64)} %(asm_spec_common)"
 145 #define LINK_OS_FREEBSD_SPEC "%{m32:%(link_os_freebsd_spec32)}%{!m32:%(link_os_freebsd_spec64)}"
 146
 147 #define ASM_SPEC32 "-a32 \
 148 %{mrelocatable} %{mrelocatable-lib} %{" FPIE_OR_FPIC_SPEC ":-K PIC} \
 149 %{memb} %{!memb: %{msdata=eabi: -memb}} \
 150 %{!mlittle: %{!mlittle-endian: %{!mbig: %{!mbig-endian: \
 151     %{mcall-freebsd: -mbig} \
 152     %{mcall-i960-old: -mlittle} \
 153     %{mcall-linux: -mbig} \
 154     %{mcall-gnu: -mbig} \
 155     %{mcall-netbsd: -mbig} \
 156 }}}}"
 157
 158 #define ASM_SPEC64 "-a64"
 159
 160 #define ASM_SPEC_COMMON "%(asm_cpu) \
 161 %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}} \
 162 %{mlittle} %{mlittle-endian} %{mbig} %{mbig-endian}"
 163
 164 #undef  SUBSUBTARGET_EXTRA_SPECS
 165 #define SUBSUBTARGET_EXTRA_SPECS                                        \
 166   { "asm_spec_common",          ASM_SPEC_COMMON },                      \
 167   { "asm_spec32",               ASM_SPEC32 },                           \
 168   { "asm_spec64",               ASM_SPEC64 },                           \
 169   { "link_os_freebsd_spec32",   LINK_OS_FREEBSD_SPEC32 },               \
 170   { "link_os_freebsd_spec64",   LINK_OS_FREEBSD_SPEC64 },
 171
 172 #define LINK_OS_FREEBSD_SPEC_DEF "\
 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 " FBSD_DYNAMIC_LINKER "}} \
 181     %{static:-Bstatic}} \
 182   %{symbolic:-Bsymbolic}"
 183
 184 #define LINK_OS_FREEBSD_SPEC32 "-melf32ppc_fbsd " LINK_OS_FREEBSD_SPEC_DEF
 185
 186 #define LINK_OS_FREEBSD_SPEC64 "-melf64ppc_fbsd " LINK_OS_FREEBSD_SPEC_DEF
 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) ? PAD_UPWARD : targetm.calls.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
 308 #undef  WCHAR_TYPE_SIZE
 309 #define WCHAR_TYPE_SIZE 32
 310
 311 /* Function profiling bits */
 312 #undef  RS6000_MCOUNT
 313 #define RS6000_MCOUNT "_mcount"
 314
 315 #define PROFILE_HOOK(LABEL) \
 316   do { if (TARGET_64BIT) output_profile_hook (LABEL); } while (0)
 317
 318 /* _init and _fini functions are built from bits spread across many
 319    object files, each potentially with a different TOC pointer.  For
 320    that reason, place a nop after the call so that the linker can
 321    restore the TOC pointer if a TOC adjusting call stub is needed.  */
 322 #ifdef __powerpc64__
 323 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 324   asm (SECTION_OP "\n"                                  \
 325 "       bl " #FUNC "\n"                                 \
 326 "       nop\n"                                          \
 327 "       .previous");
 328 #endif
 329
 330 /* FP save and restore routines.  */
 331 #undef  SAVE_FP_PREFIX
 332 #define SAVE_FP_PREFIX (TARGET_64BIT ? "._savef" : "_savefpr_")
 333 #undef  SAVE_FP_SUFFIX
 334 #define SAVE_FP_SUFFIX ""
 335 #undef  RESTORE_FP_PREFIX
 336 #define RESTORE_FP_PREFIX (TARGET_64BIT ? "._restf" : "_restfpr_")
 337 #undef  RESTORE_FP_SUFFIX
 338 #define RESTORE_FP_SUFFIX ""
 339
 340 /* Select a format to encode pointers in exception handling data.  CODE
 341    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
 342    true if the symbol may be affected by dynamic relocations.  */
 343 #undef  ASM_PREFERRED_EH_DATA_FORMAT
 344 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 345   (TARGET_64BIT || flag_pic                                             \
 346    ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel               \
 347       | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4))             \
 348    : DW_EH_PE_absptr)
 349
 350 /* Static stack checking is supported by means of probes.  */
 351 #define STACK_CHECK_STATIC_BUILTIN 1
 352
 353 /* The default value isn't sufficient in 64-bit mode.  */
 354 #define STACK_CHECK_PROTECT (TARGET_64BIT ? 16 * 1024 : 12 * 1024)
 355
 356 /* Use standard DWARF numbering for DWARF debugging information.  */
 357 #define RS6000_USE_DWARF_NUMBERING
 358
 359 /* PowerPC64 Linux word-aligns FP doubles when -malign-power is given.  */
 360 #undef  ADJUST_FIELD_ALIGN
 361 #define ADJUST_FIELD_ALIGN(FIELD, TYPE, COMPUTED) \
 362   (rs6000_special_adjust_field_align_p ((TYPE), (COMPUTED))             \
 363    ? 128                                                                \
 364    : (TARGET_64BIT                                                      \
 365       && TARGET_ALIGN_NATURAL == 0                                      \
 366       && TYPE_MODE (strip_array_types (TYPE)) == DFmode)                \
 367    ? MIN ((COMPUTED), 32)                                               \
 368    : (COMPUTED))
 369
 370 #undef  TOC_SECTION_ASM_OP
 371 #define TOC_SECTION_ASM_OP \
 372   (TARGET_64BIT                                         \
 373    ? "\t.section\t\".toc\",\"aw\""                      \
 374    : "\t.section\t\".got\",\"aw\"")
 375
 376 #undef  MINIMAL_TOC_SECTION_ASM_OP
 377 #define MINIMAL_TOC_SECTION_ASM_OP \
 378   (TARGET_64BIT                                         \
 379    ? "\t.section\t\".toc1\",\"aw\""                     \
 380    : (flag_pic                                          \
 381       ? "\t.section\t\".got2\",\"aw\""                  \
 382       : "\t.section\t\".got1\",\"aw\""))
 383
 384 /* This is how to declare the size of a function.  */
 385 #undef  ASM_DECLARE_FUNCTION_SIZE
 386 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 387   do                                                                    \
 388     {                                                                   \
 389       if (!flag_inhibit_size_directive)                                 \
 390         {                                                               \
 391           fputs ("\t.size\t", (FILE));                                  \
 392           if (TARGET_64BIT && DOT_SYMBOLS)                              \
 393             putc ('.', (FILE));                                         \
 394           assemble_name ((FILE), (FNAME));                              \
 395           fputs (",.-", (FILE));                                        \
 396           rs6000_output_function_entry (FILE, FNAME);                   \
 397           putc ('\n', (FILE));                                          \
 398         }                                                               \
 399     }                                                                   \
 400   while (0)
 401
 402 #undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
 403 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
 404   (TARGET_TOC                                                           \
 405    && (SYMBOL_REF_P (X)                                                 \
 406        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
 407            && SYMBOL_REF_P (XEXP (XEXP (X, 0), 0)))                     \
 408        || GET_CODE (X) == LABEL_REF                                     \
 409        || (CONST_INT_P (X)                                              \
 410            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
 411        || (CONST_DOUBLE_P (X)                                           \
 412            && ((TARGET_64BIT                                            \
 413                 && (TARGET_MINIMAL_TOC                                  \
 414                     || (SCALAR_FLOAT_MODE_P (GET_MODE (X))              \
 415                         && ! TARGET_NO_FP_IN_TOC)))                     \
 416                || (!TARGET_64BIT                                        \
 417                    && !TARGET_NO_FP_IN_TOC                              \
 418                    && SCALAR_FLOAT_MODE_P (GET_MODE (X))                \
 419                    && BITS_PER_WORD == HOST_BITS_PER_INT)))))
 420
 421 /* Use --as-needed -lgcc_s for eh support.  */
 422 #ifdef HAVE_LD_AS_NEEDED
 423 #define USE_LD_AS_NEEDED 1
 424 #endif
 425
 426 #define POWERPC_FREEBSD