gcc/config/i386/darwin.h

   1 /* Target definitions for x86 running Darwin.
   2    Copyright (C) 2001-2017 Free Software Foundation, Inc.
   3    Contributed by Apple Computer Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 /* Enable Mach-O bits in generic x86 code.  */
  22 #undef TARGET_MACHO
  23 #define TARGET_MACHO 1
  24
  25 #undef DARWIN_X86
  26 #define DARWIN_X86 1
  27
  28 #undef  TARGET_64BIT
  29 #undef  TARGET_64BIT_P
  30 #define TARGET_64BIT TARGET_ISA_64BIT
  31 #define TARGET_64BIT_P(x) TARGET_ISA_64BIT_P(x)
  32
  33 #ifdef IN_LIBGCC2
  34 #undef TARGET_64BIT
  35 #ifdef __x86_64__
  36 #define TARGET_64BIT 1
  37 #else
  38 #define TARGET_64BIT 0
  39 #endif
  40 #endif
  41
  42 /* WORKAROUND pr80556:
  43    For x86_64 Darwin10 and later, the unwinder is in libunwind (redirected
  44    from libSystem).  This doesn't use the keymgr (see keymgr.c) and therefore
  45    the calls that libgcc makes to obtain the KEYMGR_GCC3_DW2_OBJ_LIST are not
  46    updated to include new images, and might not even be valid for a single
  47    image.
  48    Therefore, for 64b exes at least, we must use the libunwind implementation,
  49    even when static-libgcc is specified.  We put libSystem first so that
  50    unwinder symbols are satisfied from there. */
  51 #undef REAL_LIBGCC_SPEC
  52 #define REAL_LIBGCC_SPEC                                                   \
  53    "%{static-libgcc|static:                                                \
  54       %{m64:%:version-compare(>= 10.6 mmacosx-version-min= -lSystem)}      \
  55         -lgcc_eh -lgcc;                                                    \
  56       shared-libgcc|fexceptions|fgnu-runtime:                              \
  57        %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_s.10.4)        \
  58        %:version-compare(>< 10.5 10.6 mmacosx-version-min= -lgcc_s.10.5)   \
  59        %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_ext.10.4)      \
  60        %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_ext.10.5)      \
  61        -lgcc ;                                                             \
  62       :%:version-compare(>< 10.3.9 10.5 mmacosx-version-min= -lgcc_s.10.4) \
  63        %:version-compare(>< 10.5 10.6 mmacosx-version-min= -lgcc_s.10.5)   \
  64        %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_ext.10.4)      \
  65        %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_ext.10.5)      \
  66        -lgcc }"
  67
  68 /* Size of the Obj-C jump buffer.  */
  69 #define OBJC_JBLEN ((TARGET_64BIT) ? ((9 * 2) + 3 + 16) : (18))
  70
  71 #undef TARGET_FPMATH_DEFAULT
  72 #define TARGET_FPMATH_DEFAULT (TARGET_SSE ? FPMATH_SSE : FPMATH_387)
  73
  74 #define TARGET_OS_CPP_BUILTINS()                \
  75   do                                            \
  76     {                                           \
  77       builtin_define ("__LITTLE_ENDIAN__");     \
  78       darwin_cpp_builtins (pfile);              \
  79     }                                           \
  80   while (0)
  81
  82 #undef PTRDIFF_TYPE
  83 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
  84
  85 #undef WCHAR_TYPE
  86 #define WCHAR_TYPE "int"
  87
  88 #undef WCHAR_TYPE_SIZE
  89 #define WCHAR_TYPE_SIZE 32
  90
  91 /* Generate branch islands stubs if this is true.  */
  92 extern int darwin_emit_branch_islands;
  93
  94 #undef TARGET_MACHO_BRANCH_ISLANDS
  95 #define TARGET_MACHO_BRANCH_ISLANDS darwin_emit_branch_islands
  96
  97 /* For compatibility with OSX system tools, use the new style of pic stub
  98    if this is set.  */
  99 #undef  MACHOPIC_ATT_STUB
 100 #define MACHOPIC_ATT_STUB (darwin_macho_att_stub)
 101
 102 #undef MAX_BITS_PER_WORD
 103 #define MAX_BITS_PER_WORD 64
 104
 105 #undef FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
 106 #define FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN (0)
 107
 108 #undef TARGET_KEEPS_VECTOR_ALIGNED_STACK
 109 #define TARGET_KEEPS_VECTOR_ALIGNED_STACK 1
 110
 111 /* On Darwin, the stack is 128-bit aligned at the point of every call.
 112    Failure to ensure this will lead to a crash in the system libraries
 113    or dynamic loader.  */
 114 #undef STACK_BOUNDARY
 115 #define STACK_BOUNDARY \
 116  ((profile_flag || (TARGET_64BIT && ix86_abi == MS_ABI)) \
 117   ? 128 : BITS_PER_WORD)
 118
 119 #undef MAIN_STACK_BOUNDARY
 120 #define MAIN_STACK_BOUNDARY 128
 121
 122 /* Since we'll never want a stack boundary less aligned than 128 bits
 123    we need the extra work here otherwise bits of gcc get very grumpy
 124    when we ask for lower alignment.  We could just reject values less
 125    than 128 bits for Darwin, but it's easier to up the alignment if
 126    it's below the minimum.  */
 127 #undef PREFERRED_STACK_BOUNDARY
 128 #define PREFERRED_STACK_BOUNDARY                        \
 129   MAX (128, ix86_preferred_stack_boundary)
 130
 131 /* We want -fPIC by default, unless we're using -static to compile for
 132    the kernel or some such.  */
 133
 134 #undef CC1_SPEC
 135 #define CC1_SPEC "%(cc1_cpu) \
 136   %{!mkernel:%{!static:%{!mdynamic-no-pic:-fPIC}}} \
 137   %{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }} " \
 138   DARWIN_CC1_SPEC
 139
 140 #undef ASM_SPEC
 141 #define ASM_SPEC "-arch %(darwin_arch) \
 142   " ASM_OPTIONS " -force_cpusubtype_ALL \
 143   %{static}" ASM_MMACOSX_VERSION_MIN_SPEC
 144
 145 #define DARWIN_ARCH_SPEC "%{m64:x86_64;:i386}"
 146 #define DARWIN_SUBARCH_SPEC DARWIN_ARCH_SPEC
 147
 148 #undef ENDFILE_SPEC
 149 #define ENDFILE_SPEC \
 150   "%{Ofast|ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \
 151    %{mpc32:crtprec32.o%s} \
 152    %{mpc64:crtprec64.o%s} \
 153    %{mpc80:crtprec80.o%s}" TM_DESTRUCTOR
 154
 155 #undef SUBTARGET_EXTRA_SPECS
 156 #define SUBTARGET_EXTRA_SPECS                                   \
 157   DARWIN_EXTRA_SPECS                                            \
 158   { "darwin_arch", DARWIN_ARCH_SPEC },                          \
 159   { "darwin_crt2", "" },                                        \
 160   { "darwin_subarch", DARWIN_SUBARCH_SPEC },
 161
 162 /* The Darwin assembler mostly follows AT&T syntax.  */
 163 #undef ASSEMBLER_DIALECT
 164 #define ASSEMBLER_DIALECT ASM_ATT
 165
 166 /* Define macro used to output shift-double opcodes when the shift
 167    count is in %cl.  Some assemblers require %cl as an argument;
 168    some don't.  This macro controls what to do: by default, don't
 169    print %cl.  */
 170
 171 #define SHIFT_DOUBLE_OMITS_COUNT 0
 172
 173 #undef TARGET_ASM_FILE_END
 174 #define TARGET_ASM_FILE_END darwin_file_end
 175
 176 /* Define the syntax of pseudo-ops, labels and comments.  */
 177
 178 /* String containing the assembler's comment-starter.  */
 179
 180 #define ASM_COMMENT_START "#"
 181
 182 /* By default, target has a 80387, uses IEEE compatible arithmetic,
 183    and returns float values in the 387.  */
 184
 185 #undef TARGET_SUBTARGET_DEFAULT
 186 #define TARGET_SUBTARGET_DEFAULT (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_128BIT_LONG_DOUBLE)
 187
 188 /* For darwin we want to target specific processor features as a minimum,
 189    but these unfortunately don't correspond to a specific processor.  */
 190 #undef TARGET_SUBTARGET32_ISA_DEFAULT
 191 #define TARGET_SUBTARGET32_ISA_DEFAULT (OPTION_MASK_ISA_MMX             \
 192                                         | OPTION_MASK_ISA_SSE           \
 193                                         | OPTION_MASK_ISA_SSE2          \
 194                                         | OPTION_MASK_ISA_SSE3)
 195
 196 #undef TARGET_SUBTARGET64_ISA_DEFAULT
 197 #define TARGET_SUBTARGET64_ISA_DEFAULT TARGET_SUBTARGET32_ISA_DEFAULT
 198
 199 #undef GOT_SYMBOL_NAME
 200 #define GOT_SYMBOL_NAME MACHOPIC_FUNCTION_BASE_NAME
 201
 202 /* Define the syntax of pseudo-ops, labels and comments.  */
 203
 204 #define LPREFIX "L"
 205
 206 /* Assembler pseudos to introduce constants of various size.  */
 207
 208 #define ASM_BYTE "\t.byte\t"
 209 #define ASM_SHORT "\t.word\t"
 210 #define ASM_LONG "\t.long\t"
 211 #define ASM_QUAD "\t.quad\t"
 212
 213 #define SUBTARGET_ENCODE_SECTION_INFO  darwin_encode_section_info
 214
 215 #undef ASM_OUTPUT_ALIGN
 216 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 217  do { if ((LOG) != 0)                   \
 218         {                               \
 219           if (in_section == text_section) \
 220             fprintf (FILE, "\t%s %d,0x90\n", ALIGN_ASM_OP, (LOG)); \
 221           else                          \
 222             fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG)); \
 223         }                               \
 224     } while (0)
 225
 226 /* Darwin profiling -- call mcount.  */
 227 #undef FUNCTION_PROFILER
 228 #define FUNCTION_PROFILER(FILE, LABELNO)                                \
 229     do {                                                                \
 230       if (TARGET_MACHO_BRANCH_ISLANDS                                   \
 231            && MACHOPIC_INDIRECT && !TARGET_64BIT)                       \
 232         {                                                               \
 233           const char *name = machopic_mcount_stub_name ();              \
 234           fprintf (FILE, "\tcall %s\n", name+1);  /*  skip '&'  */      \
 235           machopic_validate_stub_or_non_lazy_ptr (name);                \
 236         }                                                               \
 237       else fprintf (FILE, "\tcall mcount\n");                           \
 238     } while (0)
 239
 240 #define C_COMMON_OVERRIDE_OPTIONS                                       \
 241   do {                                                                  \
 242     SUBTARGET_C_COMMON_OVERRIDE_OPTIONS;                                \
 243   } while (0)
 244
 245 #undef SUBTARGET_OVERRIDE_OPTIONS
 246 #define SUBTARGET_OVERRIDE_OPTIONS \
 247 do {                                                                    \
 248   if (TARGET_64BIT && MACHO_DYNAMIC_NO_PIC_P)                           \
 249     target_flags &= ~MASK_MACHO_DYNAMIC_NO_PIC;                         \
 250 } while (0)
 251
 252 /* Darwin on x86_64 uses dwarf-2 by default.  Pre-darwin9 32-bit
 253    compiles default to stabs+.  darwin9+ defaults to dwarf-2.  */
 254 #ifndef DARWIN_PREFER_DWARF
 255 #undef PREFERRED_DEBUGGING_TYPE
 256 #ifdef HAVE_AS_STABS_DIRECTIVE
 257 #define PREFERRED_DEBUGGING_TYPE (TARGET_64BIT ? DWARF2_DEBUG : DBX_DEBUG)
 258 #else
 259 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 260 #endif
 261 #endif
 262
 263 /* Darwin uses the standard DWARF register numbers but the default
 264    register numbers for STABS.  Fortunately for 64-bit code the
 265    default and the standard are the same.  */
 266 #undef DBX_REGISTER_NUMBER
 267 #define DBX_REGISTER_NUMBER(n)                                  \
 268   (TARGET_64BIT ? dbx64_register_map[n]                         \
 269    : write_symbols == DWARF2_DEBUG ? svr4_dbx_register_map[n]   \
 270    : dbx_register_map[n])
 271
 272 /* Unfortunately, the 32-bit EH information also doesn't use the standard
 273    DWARF register numbers.  */
 274 #define DWARF2_FRAME_REG_OUT(n, for_eh)                                 \
 275   (! (for_eh) || write_symbols != DWARF2_DEBUG || TARGET_64BIT ? (n)    \
 276    : (n) == 5 ? 4                                                       \
 277    : (n) == 4 ? 5                                                       \
 278    : (n) >= 11 && (n) <= 18 ? (n) + 1                                   \
 279    : (n))
 280
 281 #undef REGISTER_SUBTARGET_PRAGMAS
 282 #define REGISTER_SUBTARGET_PRAGMAS() DARWIN_REGISTER_TARGET_PRAGMAS()
 283
 284 #undef TARGET_SET_DEFAULT_TYPE_ATTRIBUTES
 285 #define TARGET_SET_DEFAULT_TYPE_ATTRIBUTES darwin_set_default_type_attributes
 286
 287 /* For 64-bit, we need to add 4 because @GOTPCREL is relative to the
 288    end of the instruction, but without the 4 we'd only have the right
 289    address for the start of the instruction.  */
 290 #undef ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX
 291 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE)     \
 292   if (TARGET_64BIT)                                                             \
 293     {                                                                           \
 294       if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_pcrel)                 \
 295         {                                                                       \
 296            fputs (ASM_LONG, FILE);                                              \
 297            assemble_name (FILE, XSTR (ADDR, 0));                                \
 298            fputs ("+4@GOTPCREL", FILE);                                         \
 299            goto DONE;                                                           \
 300         }                                                                       \
 301     }                                                                           \
 302   else                                                                          \
 303     {                                                                           \
 304       if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1))                      \
 305         {                                                                       \
 306           darwin_non_lazy_pcrel (FILE, ADDR);                                   \
 307           goto DONE;                                                            \
 308         }                                                                       \
 309     }
 310
 311 /* This needs to move since i386 uses the first flag and other flags are
 312    used in Mach-O.  */
 313 #undef MACHO_SYMBOL_FLAG_VARIABLE
 314 #define MACHO_SYMBOL_FLAG_VARIABLE ((SYMBOL_FLAG_MACH_DEP) << 3)
 315
 316 #undef MACHOPIC_NL_SYMBOL_PTR_SECTION
 317 #define MACHOPIC_NL_SYMBOL_PTR_SECTION \
 318                 ".section __IMPORT,__pointers,non_lazy_symbol_pointers"
 319
 320 #define SUBTARGET32_DEFAULT_CPU "i686"
 321
 322 #undef  SUBTARGET_INIT_BUILTINS
 323 #define SUBTARGET_INIT_BUILTINS                                 \
 324 do {                                                            \
 325   ix86_builtins[(int) IX86_BUILTIN_CFSTRING]                    \
 326     = darwin_init_cfstring_builtins ((unsigned) (IX86_BUILTIN_CFSTRING));       \
 327   darwin_rename_builtins ();                                    \
 328 } while(0)