gcc/config/rs6000/freebsd64.h

   1 /* Definitions for 64-bit PowerPC running FreeBSD using the ELF format
   2    Copyright (C) 2012-2024 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   " FBSD_LINK_PG_NOTE " \
 116   %{v:-V} \
 117   %{assert*} %{R*} %{rpath*} %{defsym*} \
 118   %{shared:-Bshareable %{h*} %{soname*}} \
 119   %{!shared: \
 120     %{!static: \
 121       %{rdynamic: -export-dynamic} \
 122       %{!dynamic-linker:-dynamic-linker " FBSD_DYNAMIC_LINKER "}} \
 123     %{static:-Bstatic}} \
 124   %{symbolic:-Bsymbolic}"
 125
 126 #undef  DEFAULT_ASM_ENDIAN
 127 #define LINK_OS_FREEBSD_SPEC32 "-melf32ppc_fbsd " LINK_OS_FREEBSD_SPEC_DEF
 128 #if (TARGET_DEFAULT & MASK_LITTLE_ENDIAN)
 129 #define DEFAULT_ASM_ENDIAN " -mlittle"
 130 #define LINK_OS_FREEBSD_SPEC64 "-melf64lppc_fbsd " LINK_OS_FREEBSD_SPEC_DEF
 131 #else
 132 #define DEFAULT_ASM_ENDIAN " -mbig"
 133 #define LINK_OS_FREEBSD_SPEC64 "-melf64ppc_fbsd " LINK_OS_FREEBSD_SPEC_DEF
 134 #endif
 135
 136 #undef  MULTILIB_DEFAULTS
 137 #define MULTILIB_DEFAULTS { "m64" }
 138
 139 /* PowerPC-64 FreeBSD increases natural record alignment to doubleword if
 140    the first field is an FP double, only if in power alignment mode.  */
 141 #undef  ROUND_TYPE_ALIGN
 142 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                   \
 143   ((TARGET_64BIT                                                        \
 144     && RECORD_OR_UNION_TYPE_P (STRUCT)                  \
 145     && TARGET_ALIGN_NATURAL == 0)                                       \
 146    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)      \
 147    : MAX ((COMPUTED), (SPECIFIED)))
 148
 149 /* Use the default for compiling target libs.  */
 150 #ifdef IN_TARGET_LIBS
 151 #undef TARGET_ALIGN_NATURAL
 152 #define TARGET_ALIGN_NATURAL 1
 153 #endif
 154
 155 /* Indicate that jump tables go in the text section.  */
 156 #undef  JUMP_TABLES_IN_TEXT_SECTION
 157 #define JUMP_TABLES_IN_TEXT_SECTION TARGET_64BIT
 158
 159 /* The linux ppc64 ABI isn't explicit on whether aggregates smaller
 160    than a doubleword should be padded upward or downward.  You could
 161    reasonably assume that they follow the normal rules for structure
 162    layout treating the parameter area as any other block of memory,
 163    then map the reg param area to registers.  i.e. pad upward.
 164    Setting both of the following defines results in this behavior.
 165    Setting just the first one will result in aggregates that fit in a
 166    doubleword being padded downward, and others being padded upward.
 167    Not a bad idea as this results in struct { int x; } being passed
 168    the same way as an int.  */
 169 #define AGGREGATE_PADDING_FIXED TARGET_64BIT
 170 #define AGGREGATES_PAD_UPWARD_ALWAYS 0
 171
 172 /* Specify padding for the last element of a block move between
 173    registers and memory.  FIRST is nonzero if this is the only
 174    element.  */
 175 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 176   (!(FIRST) ? PAD_UPWARD : targetm.calls.function_arg_padding (MODE, TYPE))
 177
 178 /* FreeBSD doesn't support saving and restoring 64-bit regs with a 32-bit
 179    kernel. This is supported when running on a 64-bit kernel with
 180    COMPAT_FREEBSD32, but tell GCC it isn't so that our 32-bit binaries
 181    are compatible. */
 182 #define OS_MISSING_POWERPC64 !TARGET_64BIT
 183
 184 #undef  FBSD_TARGET_CPU_CPP_BUILTINS
 185 #define FBSD_TARGET_CPU_CPP_BUILTINS()                  \
 186   do                                                    \
 187     {                                                   \
 188       builtin_define ("__PPC__");                       \
 189       builtin_define ("__ppc__");                       \
 190       builtin_define ("__powerpc__");                   \
 191       if (TARGET_64BIT)                                 \
 192         {                                               \
 193           builtin_define ("__arch64__");                \
 194           builtin_define ("__LP64__");                  \
 195           builtin_define ("__PPC64__");                 \
 196           builtin_define ("__powerpc64__");             \
 197           builtin_assert ("cpu=powerpc64");             \
 198           builtin_assert ("machine=powerpc64");         \
 199         }                                               \
 200       else                                              \
 201         {                                               \
 202           builtin_define_std ("PPC");                   \
 203           builtin_define_std ("powerpc");               \
 204           builtin_assert ("cpu=powerpc");               \
 205           builtin_assert ("machine=powerpc");           \
 206           TARGET_OS_SYSV_CPP_BUILTINS ();               \
 207         }                                               \
 208     }                                                   \
 209   while (0)
 210
 211 #undef  CPP_OS_DEFAULT_SPEC
 212 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_freebsd)"
 213
 214 #undef CPP_OS_FREEBSD_SPEC
 215 #define CPP_OS_FREEBSD_SPEC ""
 216
 217 #undef  STARTFILE_DEFAULT_SPEC
 218 #define STARTFILE_DEFAULT_SPEC "%(startfile_freebsd)"
 219
 220 #undef  ENDFILE_DEFAULT_SPEC
 221 #define ENDFILE_DEFAULT_SPEC "%(endfile_freebsd)"
 222
 223 #undef  LIB_DEFAULT_SPEC
 224 #define LIB_DEFAULT_SPEC "%(lib_freebsd)"
 225
 226 #undef  LINK_START_DEFAULT_SPEC
 227 #define LINK_START_DEFAULT_SPEC "%(link_start_freebsd)"
 228
 229 #undef  LINK_OS_DEFAULT_SPEC
 230 #define LINK_OS_DEFAULT_SPEC "%(link_os_freebsd)"
 231
 232 /* XXX: This is wrong for many platforms in sysv4.h.
 233    We should work on getting that definition fixed.  */
 234 #undef  LINK_SHLIB_SPEC
 235 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
 236
 237
 238 /************************[  Target stuff  ]***********************************/
 239
 240 /* Define the actual types of some ANSI-mandated types.
 241    Needs to agree with <machine/ansi.h>.  GCC defaults come from c-decl.cc,
 242    c-common.cc, and config/<arch>/<arch>.h.  */
 243
 244
 245 #undef  SIZE_TYPE
 246 #define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int")
 247
 248 #undef  PTRDIFF_TYPE
 249 #define PTRDIFF_TYPE    (TARGET_64BIT ? "long int" : "int")
 250
 251 /* rs6000.h gets this wrong for FreeBSD.  We use the GCC defaults instead.  */
 252 #undef WCHAR_TYPE
 253
 254 #undef  WCHAR_TYPE_SIZE
 255 #define WCHAR_TYPE_SIZE 32
 256
 257 /* Function profiling bits */
 258 #undef  RS6000_MCOUNT
 259 #define RS6000_MCOUNT "_mcount"
 260
 261 #define PROFILE_HOOK(LABEL) \
 262   do { if (TARGET_64BIT) output_profile_hook (LABEL); } while (0)
 263
 264 /* _init and _fini functions are built from bits spread across many
 265    object files, each potentially with a different TOC pointer.  For
 266    that reason, place a nop after the call so that the linker can
 267    restore the TOC pointer if a TOC adjusting call stub is needed.  */
 268 #ifdef __powerpc64__
 269 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 270   asm (SECTION_OP "\n"                                  \
 271 "       bl " #FUNC "\n"                                 \
 272 "       nop\n"                                          \
 273 "       .previous");
 274 #endif
 275
 276 /* FP save and restore routines.  */
 277 #undef  SAVE_FP_PREFIX
 278 #define SAVE_FP_PREFIX (TARGET_64BIT ? "._savef" : "_savefpr_")
 279 #undef  SAVE_FP_SUFFIX
 280 #define SAVE_FP_SUFFIX ""
 281 #undef  RESTORE_FP_PREFIX
 282 #define RESTORE_FP_PREFIX (TARGET_64BIT ? "._restf" : "_restfpr_")
 283 #undef  RESTORE_FP_SUFFIX
 284 #define RESTORE_FP_SUFFIX ""
 285
 286 /* Select a format to encode pointers in exception handling data.  CODE
 287    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
 288    true if the symbol may be affected by dynamic relocations.  */
 289 #undef  ASM_PREFERRED_EH_DATA_FORMAT
 290 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 291   (TARGET_64BIT || flag_pic                                             \
 292    ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel               \
 293       | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4))             \
 294    : DW_EH_PE_absptr)
 295
 296 /* Static stack checking is supported by means of probes.  */
 297 #define STACK_CHECK_STATIC_BUILTIN 1
 298
 299 /* The default value isn't sufficient in 64-bit mode.  */
 300 #define STACK_CHECK_PROTECT (TARGET_64BIT ? 16 * 1024 : 12 * 1024)
 301
 302 /* Use standard DWARF numbering for DWARF debugging information.  */
 303 #define RS6000_USE_DWARF_NUMBERING
 304
 305 /* PowerPC64 Linux word-aligns FP doubles when -malign-power is given.  */
 306 #undef  ADJUST_FIELD_ALIGN
 307 #define ADJUST_FIELD_ALIGN(FIELD, TYPE, COMPUTED) \
 308   ((TARGET_64BIT                                                        \
 309     && TARGET_ALIGN_NATURAL == 0                                        \
 310     && TYPE_MODE (strip_array_types (TYPE)) == DFmode)                  \
 311    ? MIN ((COMPUTED), 32)                                               \
 312    : (COMPUTED))
 313
 314 #undef  TOC_SECTION_ASM_OP
 315 #define TOC_SECTION_ASM_OP \
 316   (TARGET_64BIT                                         \
 317    ? "\t.section\t\".toc\",\"aw\""                      \
 318    : "\t.section\t\".got\",\"aw\"")
 319
 320 #undef  MINIMAL_TOC_SECTION_ASM_OP
 321 #define MINIMAL_TOC_SECTION_ASM_OP \
 322   (TARGET_64BIT                                         \
 323    ? "\t.section\t\".toc1\",\"aw\""                     \
 324    : (flag_pic                                          \
 325       ? "\t.section\t\".got2\",\"aw\""                  \
 326       : "\t.section\t\".got1\",\"aw\""))
 327
 328 /* This is how to declare the size of a function.  */
 329 #undef  ASM_DECLARE_FUNCTION_SIZE
 330 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 331   do                                                                    \
 332     {                                                                   \
 333       if (!flag_inhibit_size_directive)                                 \
 334         {                                                               \
 335           fputs ("\t.size\t", (FILE));                                  \
 336           if (TARGET_64BIT && DOT_SYMBOLS)                              \
 337             putc ('.', (FILE));                                         \
 338           assemble_name ((FILE), (FNAME));                              \
 339           fputs (",.-", (FILE));                                        \
 340           rs6000_output_function_entry (FILE, FNAME);                   \
 341           putc ('\n', (FILE));                                          \
 342         }                                                               \
 343     }                                                                   \
 344   while (0)
 345
 346 #undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
 347 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
 348   (TARGET_TOC                                                           \
 349    && (SYMBOL_REF_P (X)                                                 \
 350        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
 351            && SYMBOL_REF_P (XEXP (XEXP (X, 0), 0)))                     \
 352        || GET_CODE (X) == LABEL_REF                                     \
 353        || (CONST_INT_P (X)                                              \
 354            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
 355        || (CONST_DOUBLE_P (X)                                           \
 356            && ((TARGET_64BIT                                            \
 357                 && (TARGET_MINIMAL_TOC                                  \
 358                     || (SCALAR_FLOAT_MODE_P (GET_MODE (X))              \
 359                         && ! TARGET_NO_FP_IN_TOC)))                     \
 360                || (!TARGET_64BIT                                        \
 361                    && !TARGET_NO_FP_IN_TOC                              \
 362                    && SCALAR_FLOAT_MODE_P (GET_MODE (X))                \
 363                    && BITS_PER_WORD == HOST_BITS_PER_INT)))))
 364
 365 /* Use --as-needed -lgcc_s for eh support.  */
 366 #ifdef HAVE_LD_AS_NEEDED
 367 #define USE_LD_AS_NEEDED 1
 368 #endif
 369
 370 #define POWERPC_FREEBSD