gcc/config/rs6000/freebsd64.h

   1 /* Definitions for 64-bit PowerPC running FreeBSD using the ELF format
   2    Copyright (C) 2012-2022 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 #undef  PROCESSOR_DEFAULT
  55 #define PROCESSOR_DEFAULT PROCESSOR_PPC7450
  56 #undef  PROCESSOR_DEFAULT64
  57 #define PROCESSOR_DEFAULT64 PROCESSOR_POWER8
  58
  59 /* We don't need to generate entries in .fixup, except when
  60    -mrelocatable or -mrelocatable-lib is given.  */
  61 #undef RELOCATABLE_NEEDS_FIXUP
  62 #define RELOCATABLE_NEEDS_FIXUP \
  63   (rs6000_isa_flags & rs6000_isa_flags_explicit & OPTION_MASK_RELOCATABLE)
  64
  65 #undef  RS6000_ABI_NAME
  66 #define RS6000_ABI_NAME "freebsd"
  67
  68 #define INVALID_64BIT "-m%s not supported in this configuration"
  69 #define INVALID_32BIT INVALID_64BIT
  70
  71 /* Use LINUX64 instead of FREEBSD64 for compat with e.g. sysv4le.h */
  72 #ifdef LINUX64_DEFAULT_ABI_ELFv2
  73 #define ELFv2_ABI_CHECK (rs6000_elf_abi != 1)
  74 #else
  75 #define ELFv2_ABI_CHECK (rs6000_elf_abi == 2)
  76 #endif
  77
  78 #undef  SUBSUBTARGET_OVERRIDE_OPTIONS
  79 #define SUBSUBTARGET_OVERRIDE_OPTIONS                           \
  80   do rs6000_linux64_override_options (); while (0)
  81
  82 #undef  ASM_SPEC
  83 #undef  LINK_OS_FREEBSD_SPEC
  84
  85 #define ASM_SPEC         "%{m32:%(asm_spec32)}%{!m32:%(asm_spec64)} %(asm_spec_common)"
  86 #define LINK_OS_FREEBSD_SPEC "%{m32:%(link_os_freebsd_spec32)}%{!m32:%(link_os_freebsd_spec64)}"
  87
  88 #define ASM_SPEC32 "-a32 \
  89 %{mrelocatable} %{mrelocatable-lib} %{" FPIE_OR_FPIC_SPEC ":-K PIC} \
  90 %{memb} %{!memb: %{msdata=eabi: -memb}} \
  91 %{!mlittle: %{!mlittle-endian: %{!mbig: %{!mbig-endian: \
  92     %{mcall-freebsd: -mbig} \
  93     %{mcall-i960-old: -mlittle} \
  94     %{mcall-linux: -mbig} \
  95     %{mcall-gnu: -mbig} \
  96     %{mcall-netbsd: -mbig} \
  97 }}}}"
  98
  99 #define ASM_SPEC64 "-a64"
 100
 101 #define ASM_SPEC_COMMON "%(asm_cpu) \
 102 %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}}" \
 103   ENDIAN_SELECT(" -mbig", " -mlittle", DEFAULT_ASM_ENDIAN)
 104
 105 #undef  SUBSUBTARGET_EXTRA_SPECS
 106 #define SUBSUBTARGET_EXTRA_SPECS                                        \
 107   { "asm_spec_common",          ASM_SPEC_COMMON },                      \
 108   { "asm_spec32",               ASM_SPEC32 },                           \
 109   { "asm_spec64",               ASM_SPEC64 },                           \
 110   { "link_os_freebsd_spec32",   LINK_OS_FREEBSD_SPEC32 },               \
 111   { "link_os_freebsd_spec64",   LINK_OS_FREEBSD_SPEC64 },
 112
 113 #define LINK_OS_FREEBSD_SPEC_DEF "\
 114   %{p:%nconsider using `-pg' instead of `-p' with gprof(1)} \
 115   %{v:-V} \
 116   %{assert*} %{R*} %{rpath*} %{defsym*} \
 117   %{shared:-Bshareable %{h*} %{soname*}} \
 118   %{!shared: \
 119     %{!static: \
 120       %{rdynamic: -export-dynamic} \
 121       %{!dynamic-linker:-dynamic-linker " FBSD_DYNAMIC_LINKER "}} \
 122     %{static:-Bstatic}} \
 123   %{symbolic:-Bsymbolic}"
 124
 125 #undef  DEFAULT_ASM_ENDIAN
 126 #define LINK_OS_FREEBSD_SPEC32 "-melf32ppc_fbsd " LINK_OS_FREEBSD_SPEC_DEF
 127 #if (TARGET_DEFAULT & MASK_LITTLE_ENDIAN)
 128 #define DEFAULT_ASM_ENDIAN " -mlittle"
 129 #define LINK_OS_FREEBSD_SPEC64 "-melf64lppc_fbsd " LINK_OS_FREEBSD_SPEC_DEF
 130 #else
 131 #define DEFAULT_ASM_ENDIAN " -mbig"
 132 #define LINK_OS_FREEBSD_SPEC64 "-melf64ppc_fbsd " LINK_OS_FREEBSD_SPEC_DEF
 133 #endif
 134
 135 #undef  MULTILIB_DEFAULTS
 136 #define MULTILIB_DEFAULTS { "m64" }
 137
 138 /* PowerPC-64 FreeBSD increases natural record alignment to doubleword if
 139    the first field is an FP double, only if in power alignment mode.  */
 140 #undef  ROUND_TYPE_ALIGN
 141 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                   \
 142   ((TARGET_64BIT                                                        \
 143     && (TREE_CODE (STRUCT) == RECORD_TYPE                               \
 144         || TREE_CODE (STRUCT) == UNION_TYPE                             \
 145         || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                       \
 146     && TARGET_ALIGN_NATURAL == 0)                                       \
 147    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)      \
 148    : MAX ((COMPUTED), (SPECIFIED)))
 149
 150 /* Use the default for compiling target libs.  */
 151 #ifdef IN_TARGET_LIBS
 152 #undef TARGET_ALIGN_NATURAL
 153 #define TARGET_ALIGN_NATURAL 1
 154 #endif
 155
 156 /* Indicate that jump tables go in the text section.  */
 157 #undef  JUMP_TABLES_IN_TEXT_SECTION
 158 #define JUMP_TABLES_IN_TEXT_SECTION TARGET_64BIT
 159
 160 /* The linux ppc64 ABI isn't explicit on whether aggregates smaller
 161    than a doubleword should be padded upward or downward.  You could
 162    reasonably assume that they follow the normal rules for structure
 163    layout treating the parameter area as any other block of memory,
 164    then map the reg param area to registers.  i.e. pad upward.
 165    Setting both of the following defines results in this behavior.
 166    Setting just the first one will result in aggregates that fit in a
 167    doubleword being padded downward, and others being padded upward.
 168    Not a bad idea as this results in struct { int x; } being passed
 169    the same way as an int.  */
 170 #define AGGREGATE_PADDING_FIXED TARGET_64BIT
 171 #define AGGREGATES_PAD_UPWARD_ALWAYS 0
 172
 173 /* Specify padding for the last element of a block move between
 174    registers and memory.  FIRST is nonzero if this is the only
 175    element.  */
 176 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 177   (!(FIRST) ? PAD_UPWARD : targetm.calls.function_arg_padding (MODE, TYPE))
 178
 179 /* FreeBSD doesn't support saving and restoring 64-bit regs with a 32-bit
 180    kernel. This is supported when running on a 64-bit kernel with
 181    COMPAT_FREEBSD32, but tell GCC it isn't so that our 32-bit binaries
 182    are compatible. */
 183 #define OS_MISSING_POWERPC64 !TARGET_64BIT
 184
 185 #undef  FBSD_TARGET_CPU_CPP_BUILTINS
 186 #define FBSD_TARGET_CPU_CPP_BUILTINS()                  \
 187   do                                                    \
 188     {                                                   \
 189       builtin_define ("__PPC__");                       \
 190       builtin_define ("__ppc__");                       \
 191       builtin_define ("__powerpc__");                   \
 192       if (TARGET_64BIT)                                 \
 193         {                                               \
 194           builtin_define ("__arch64__");                \
 195           builtin_define ("__LP64__");                  \
 196           builtin_define ("__PPC64__");                 \
 197           builtin_define ("__powerpc64__");             \
 198           builtin_assert ("cpu=powerpc64");             \
 199           builtin_assert ("machine=powerpc64");         \
 200         }                                               \
 201       else                                              \
 202         {                                               \
 203           builtin_define_std ("PPC");                   \
 204           builtin_define_std ("powerpc");               \
 205           builtin_assert ("cpu=powerpc");               \
 206           builtin_assert ("machine=powerpc");           \
 207           TARGET_OS_SYSV_CPP_BUILTINS ();               \
 208         }                                               \
 209     }                                                   \
 210   while (0)
 211
 212 #undef  CPP_OS_DEFAULT_SPEC
 213 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_freebsd)"
 214
 215 #undef CPP_OS_FREEBSD_SPEC
 216 #define CPP_OS_FREEBSD_SPEC ""
 217
 218 #undef  STARTFILE_DEFAULT_SPEC
 219 #define STARTFILE_DEFAULT_SPEC "%(startfile_freebsd)"
 220
 221 #undef  ENDFILE_DEFAULT_SPEC
 222 #define ENDFILE_DEFAULT_SPEC "%(endfile_freebsd)"
 223
 224 #undef  LIB_DEFAULT_SPEC
 225 #define LIB_DEFAULT_SPEC "%(lib_freebsd)"
 226
 227 #undef  LINK_START_DEFAULT_SPEC
 228 #define LINK_START_DEFAULT_SPEC "%(link_start_freebsd)"
 229
 230 #undef  LINK_OS_DEFAULT_SPEC
 231 #define LINK_OS_DEFAULT_SPEC "%(link_os_freebsd)"
 232
 233 /* XXX: This is wrong for many platforms in sysv4.h.
 234    We should work on getting that definition fixed.  */
 235 #undef  LINK_SHLIB_SPEC
 236 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
 237
 238
 239 /************************[  Target stuff  ]***********************************/
 240
 241 /* Define the actual types of some ANSI-mandated types.
 242    Needs to agree with <machine/ansi.h>.  GCC defaults come from c-decl.cc,
 243    c-common.cc, and config/<arch>/<arch>.h.  */
 244
 245
 246 #undef  SIZE_TYPE
 247 #define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int")
 248
 249 #undef  PTRDIFF_TYPE
 250 #define PTRDIFF_TYPE    (TARGET_64BIT ? "long int" : "int")
 251
 252 /* rs6000.h gets this wrong for FreeBSD.  We use the GCC defaults instead.  */
 253 #undef WCHAR_TYPE
 254
 255 #undef  WCHAR_TYPE_SIZE
 256 #define WCHAR_TYPE_SIZE 32
 257
 258 /* Function profiling bits */
 259 #undef  RS6000_MCOUNT
 260 #define RS6000_MCOUNT "_mcount"
 261
 262 #define PROFILE_HOOK(LABEL) \
 263   do { if (TARGET_64BIT) output_profile_hook (LABEL); } while (0)
 264
 265 /* _init and _fini functions are built from bits spread across many
 266    object files, each potentially with a different TOC pointer.  For
 267    that reason, place a nop after the call so that the linker can
 268    restore the TOC pointer if a TOC adjusting call stub is needed.  */
 269 #ifdef __powerpc64__
 270 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 271   asm (SECTION_OP "\n"                                  \
 272 "       bl " #FUNC "\n"                                 \
 273 "       nop\n"                                          \
 274 "       .previous");
 275 #endif
 276
 277 /* FP save and restore routines.  */
 278 #undef  SAVE_FP_PREFIX
 279 #define SAVE_FP_PREFIX (TARGET_64BIT ? "._savef" : "_savefpr_")
 280 #undef  SAVE_FP_SUFFIX
 281 #define SAVE_FP_SUFFIX ""
 282 #undef  RESTORE_FP_PREFIX
 283 #define RESTORE_FP_PREFIX (TARGET_64BIT ? "._restf" : "_restfpr_")
 284 #undef  RESTORE_FP_SUFFIX
 285 #define RESTORE_FP_SUFFIX ""
 286
 287 /* Select a format to encode pointers in exception handling data.  CODE
 288    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
 289    true if the symbol may be affected by dynamic relocations.  */
 290 #undef  ASM_PREFERRED_EH_DATA_FORMAT
 291 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 292   (TARGET_64BIT || flag_pic                                             \
 293    ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel               \
 294       | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4))             \
 295    : DW_EH_PE_absptr)
 296
 297 /* Static stack checking is supported by means of probes.  */
 298 #define STACK_CHECK_STATIC_BUILTIN 1
 299
 300 /* The default value isn't sufficient in 64-bit mode.  */
 301 #define STACK_CHECK_PROTECT (TARGET_64BIT ? 16 * 1024 : 12 * 1024)
 302
 303 /* Use standard DWARF numbering for DWARF debugging information.  */
 304 #define RS6000_USE_DWARF_NUMBERING
 305
 306 /* PowerPC64 Linux word-aligns FP doubles when -malign-power is given.  */
 307 #undef  ADJUST_FIELD_ALIGN
 308 #define ADJUST_FIELD_ALIGN(FIELD, TYPE, COMPUTED) \
 309   ((TARGET_64BIT                                                        \
 310     && TARGET_ALIGN_NATURAL == 0                                        \
 311     && TYPE_MODE (strip_array_types (TYPE)) == DFmode)                  \
 312    ? MIN ((COMPUTED), 32)                                               \
 313    : (COMPUTED))
 314
 315 #undef  TOC_SECTION_ASM_OP
 316 #define TOC_SECTION_ASM_OP \
 317   (TARGET_64BIT                                         \
 318    ? "\t.section\t\".toc\",\"aw\""                      \
 319    : "\t.section\t\".got\",\"aw\"")
 320
 321 #undef  MINIMAL_TOC_SECTION_ASM_OP
 322 #define MINIMAL_TOC_SECTION_ASM_OP \
 323   (TARGET_64BIT                                         \
 324    ? "\t.section\t\".toc1\",\"aw\""                     \
 325    : (flag_pic                                          \
 326       ? "\t.section\t\".got2\",\"aw\""                  \
 327       : "\t.section\t\".got1\",\"aw\""))
 328
 329 /* This is how to declare the size of a function.  */
 330 #undef  ASM_DECLARE_FUNCTION_SIZE
 331 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 332   do                                                                    \
 333     {                                                                   \
 334       if (!flag_inhibit_size_directive)                                 \
 335         {                                                               \
 336           fputs ("\t.size\t", (FILE));                                  \
 337           if (TARGET_64BIT && DOT_SYMBOLS)                              \
 338             putc ('.', (FILE));                                         \
 339           assemble_name ((FILE), (FNAME));                              \
 340           fputs (",.-", (FILE));                                        \
 341           rs6000_output_function_entry (FILE, FNAME);                   \
 342           putc ('\n', (FILE));                                          \
 343         }                                                               \
 344     }                                                                   \
 345   while (0)
 346
 347 #undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
 348 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
 349   (TARGET_TOC                                                           \
 350    && (SYMBOL_REF_P (X)                                                 \
 351        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
 352            && SYMBOL_REF_P (XEXP (XEXP (X, 0), 0)))                     \
 353        || GET_CODE (X) == LABEL_REF                                     \
 354        || (CONST_INT_P (X)                                              \
 355            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
 356        || (CONST_DOUBLE_P (X)                                           \
 357            && ((TARGET_64BIT                                            \
 358                 && (TARGET_MINIMAL_TOC                                  \
 359                     || (SCALAR_FLOAT_MODE_P (GET_MODE (X))              \
 360                         && ! TARGET_NO_FP_IN_TOC)))                     \
 361                || (!TARGET_64BIT                                        \
 362                    && !TARGET_NO_FP_IN_TOC                              \
 363                    && SCALAR_FLOAT_MODE_P (GET_MODE (X))                \
 364                    && BITS_PER_WORD == HOST_BITS_PER_INT)))))
 365
 366 /* Use --as-needed -lgcc_s for eh support.  */
 367 #ifdef HAVE_LD_AS_NEEDED
 368 #define USE_LD_AS_NEEDED 1
 369 #endif
 370
 371 #define POWERPC_FREEBSD