gcc/config/i386/darwin.h

   1 /* Target definitions for x86 running Darwin.
   2    Copyright (C) 2001, 2002, 2004, 2005 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 2, 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 COPYING.  If not, write to
  19 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  20 Boston, MA 02110-1301, USA.  */
  21
  22 /* Enable Mach-O bits in generic x86 code.  */
  23 #undef TARGET_MACHO
  24 #define TARGET_MACHO 1
  25
  26 #define TARGET_VERSION fprintf (stderr, " (i686 Darwin)");
  27
  28 #undef TARGET_FPMATH_DEFAULT
  29 #define TARGET_FPMATH_DEFAULT (TARGET_SSE ? FPMATH_SSE : FPMATH_387)
  30
  31 #define TARGET_OS_CPP_BUILTINS()                \
  32   do                                            \
  33     {                                           \
  34       builtin_define ("__i386__");              \
  35       builtin_define ("__LITTLE_ENDIAN__");     \
  36       darwin_cpp_builtins (pfile);              \
  37     }                                           \
  38   while (0)
  39
  40 #undef FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
  41 #define FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN (0)
  42
  43 /* We want -fPIC by default, unless we're using -static to compile for
  44    the kernel or some such.  */
  45
  46 #undef CC1_SPEC
  47 #define CC1_SPEC "%{!static:-fPIC}\
  48   %{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }}"
  49
  50 #undef ASM_SPEC
  51 #define ASM_SPEC "-arch i386 -force_cpusubtype_ALL"
  52
  53 #undef SUBTARGET_EXTRA_SPECS
  54 #define SUBTARGET_EXTRA_SPECS                                   \
  55   { "darwin_arch", "i386" },                                    \
  56   { "darwin_crt2", "" },                                        \
  57   { "darwin_subarch", "i386" },
  58
  59 /* Use the following macro for any Darwin/x86-specific command-line option
  60    translation.  */
  61 #define SUBTARGET_OPTION_TRANSLATE_TABLE \
  62   { "", "" }
  63
  64 /* The Darwin assembler mostly follows AT&T syntax.  */
  65 #undef ASSEMBLER_DIALECT
  66 #define ASSEMBLER_DIALECT ASM_ATT
  67
  68 /* Define macro used to output shift-double opcodes when the shift
  69    count is in %cl.  Some assemblers require %cl as an argument;
  70    some don't.  This macro controls what to do: by default, don't
  71    print %cl.  */
  72
  73 #define SHIFT_DOUBLE_OMITS_COUNT 0
  74
  75 extern void darwin_x86_file_end (void);
  76 #undef TARGET_ASM_FILE_END
  77 #define TARGET_ASM_FILE_END darwin_x86_file_end
  78
  79 /* Define the syntax of pseudo-ops, labels and comments.  */
  80
  81 /* String containing the assembler's comment-starter.  */
  82
  83 #define ASM_COMMENT_START "#"
  84
  85 /* By default, target has a 80387, uses IEEE compatible arithmetic,
  86    and returns float values in the 387.  */
  87
  88 #define TARGET_SUBTARGET_DEFAULT (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_128BIT_LONG_DOUBLE | MASK_ALIGN_DOUBLE)
  89
  90 /* For now, disable dynamic-no-pic.  We'll need to go through i386.c
  91    with a fine-tooth comb looking for refs to flag_pic!  */
  92 #define MASK_MACHO_DYNAMIC_NO_PIC 0
  93 #define TARGET_DYNAMIC_NO_PIC     (target_flags & MASK_MACHO_DYNAMIC_NO_PIC)
  94
  95 #undef GOT_SYMBOL_NAME
  96 #define GOT_SYMBOL_NAME (machopic_function_base_name ())
  97
  98 /* Define the syntax of pseudo-ops, labels and comments.  */
  99
 100 #define LPREFIX "L"
 101
 102 /* These are used by -fbranch-probabilities */
 103 #define HOT_TEXT_SECTION_NAME "__TEXT,__text,regular,pure_instructions"
 104 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME \
 105                               "__TEXT,__unlikely,regular,pure_instructions"
 106
 107 /* Assembler pseudos to introduce constants of various size.  */
 108
 109 #define ASM_BYTE_OP "\t.byte\t"
 110 #define ASM_SHORT "\t.word\t"
 111 #define ASM_LONG "\t.long\t"
 112 /* Darwin as doesn't do ".quad".  */
 113
 114 #define SUBTARGET_ENCODE_SECTION_INFO  darwin_encode_section_info
 115
 116 #undef ASM_OUTPUT_ALIGN
 117 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 118  do { if ((LOG) != 0)                   \
 119         {                               \
 120           if (in_section == text_section) \
 121             fprintf (FILE, "\t%s %d,0x90\n", ALIGN_ASM_OP, (LOG)); \
 122           else                          \
 123             fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG)); \
 124         }                               \
 125     } while (0)
 126
 127 /* This says how to output an assembler line
 128    to define a global common symbol.  */
 129
 130 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)  \
 131 ( fputs (".comm ", (FILE)),                     \
 132   assemble_name ((FILE), (NAME)),               \
 133   fprintf ((FILE), ",%lu\n", (unsigned long)(ROUNDED)))
 134
 135 /* This says how to output an assembler line
 136    to define a local common symbol.  */
 137
 138 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)  \
 139 ( fputs (".lcomm ", (FILE)),                    \
 140   assemble_name ((FILE), (NAME)),               \
 141   fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", (ROUNDED)))
 142
 143 /* Darwin profiling -- call mcount.  */
 144 #undef FUNCTION_PROFILER
 145 #define FUNCTION_PROFILER(FILE, LABELNO)                                \
 146     do {                                                                \
 147       if (MACHOPIC_INDIRECT)                                            \
 148         {                                                               \
 149           const char *name = machopic_mcount_stub_name ();              \
 150           fprintf (FILE, "\tcall %s\n", name+1);  /*  skip '&'  */      \
 151           machopic_validate_stub_or_non_lazy_ptr (name);                \
 152         }                                                               \
 153       else fprintf (FILE, "\tcall mcount\n");                           \
 154     } while (0)
 155
 156 /* Darwin uses the standard DWARF register numbers but the default
 157    register numbers for STABS.  Fortunately for 64-bit code the
 158    default and the standard are the same.  */
 159 #undef DBX_REGISTER_NUMBER
 160 #define DBX_REGISTER_NUMBER(n) (TARGET_64BIT                    \
 161                                 ? dbx64_register_map[n]         \
 162                                 : write_symbols == DWARF2_DEBUG \
 163                                 ? svr4_dbx_register_map[n]      \
 164                                 : dbx_register_map[n])