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_64BIT 29 #define TARGET_64BIT (target_flags & MASK_64BIT) 30 31 #ifdef IN_LIBGCC2 32 #undef TARGET_64BIT 33 #ifdef __x86_64__ 34 #define TARGET_64BIT 1 35 #else 36 #define TARGET_64BIT 0 37 #endif 38 #endif 39 40 /* Size of the Obj-C jump buffer. */ 41 #define OBJC_JBLEN ((TARGET_64BIT) ? ((9 * 2) + 3 + 16) : (18)) 42 43 #undef TARGET_FPMATH_DEFAULT 44 #define TARGET_FPMATH_DEFAULT (TARGET_SSE ? FPMATH_SSE : FPMATH_387) 45 46 #define TARGET_OS_CPP_BUILTINS() \ 47 do \ 48 { \ 49 builtin_define ("__LITTLE_ENDIAN__"); \ 50 darwin_cpp_builtins (pfile); \ 51 } \ 52 while (0) 53 54 #undef PTRDIFF_TYPE 55 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int") 56 57 #undef WCHAR_TYPE 58 #define WCHAR_TYPE "int" 59 60 #undef WCHAR_TYPE_SIZE 61 #define WCHAR_TYPE_SIZE 32 62 63 #undef MAX_BITS_PER_WORD 64 #define MAX_BITS_PER_WORD 64 65 66 #undef FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN 67 #define FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN (0) 68 69 /* We want -fPIC by default, unless we're using -static to compile for 70 the kernel or some such. */ 71 72 #undef CC1_SPEC 73 #define CC1_SPEC "%{!mkernel:%{!static:%{!mdynamic-no-pic:-fPIC}}} \ 74 %{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }}" 75 76 #undef ASM_SPEC 77 #define ASM_SPEC "-arch %(darwin_arch) -force_cpusubtype_ALL" 78 79 #define DARWIN_ARCH_SPEC "%{m64:x86_64;:i386}" 80 #define DARWIN_SUBARCH_SPEC DARWIN_ARCH_SPEC 81 82 #undef SUBTARGET_EXTRA_SPECS 83 #define SUBTARGET_EXTRA_SPECS \ 84 { "darwin_arch", DARWIN_ARCH_SPEC }, \ 85 { "darwin_crt2", "" }, \ 86 { "darwin_subarch", DARWIN_SUBARCH_SPEC }, 87 88 /* Use the following macro for any Darwin/x86-specific command-line option 89 translation. */ 90 #define SUBTARGET_OPTION_TRANSLATE_TABLE \ 91 { "", "" } 92 93 /* The Darwin assembler mostly follows AT&T syntax. */ 94 #undef ASSEMBLER_DIALECT 95 #define ASSEMBLER_DIALECT ASM_ATT 96 97 /* Define macro used to output shift-double opcodes when the shift 98 count is in %cl. Some assemblers require %cl as an argument; 99 some don't. This macro controls what to do: by default, don't 100 print %cl. */ 101 102 #define SHIFT_DOUBLE_OMITS_COUNT 0 103 104 extern void darwin_x86_file_end (void); 105 #undef TARGET_ASM_FILE_END 106 #define TARGET_ASM_FILE_END darwin_x86_file_end 107 108 /* Define the syntax of pseudo-ops, labels and comments. */ 109 110 /* String containing the assembler's comment-starter. */ 111 112 #define ASM_COMMENT_START "#" 113 114 /* By default, target has a 80387, uses IEEE compatible arithmetic, 115 and returns float values in the 387. */ 116 117 #define TARGET_SUBTARGET_DEFAULT (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_128BIT_LONG_DOUBLE) 118 119 /* For now, disable dynamic-no-pic. We'll need to go through i386.c 120 with a fine-tooth comb looking for refs to flag_pic! */ 121 #define MASK_MACHO_DYNAMIC_NO_PIC 0 122 #define TARGET_DYNAMIC_NO_PIC (target_flags & MASK_MACHO_DYNAMIC_NO_PIC) 123 124 #undef GOT_SYMBOL_NAME 125 #define GOT_SYMBOL_NAME (machopic_function_base_name ()) 126 127 /* Define the syntax of pseudo-ops, labels and comments. */ 128 129 #define LPREFIX "L" 130 131 /* These are used by -fbranch-probabilities */ 132 #define HOT_TEXT_SECTION_NAME "__TEXT,__text,regular,pure_instructions" 133 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME \ 134 "__TEXT,__unlikely,regular,pure_instructions" 135 136 /* Assembler pseudos to introduce constants of various size. */ 137 138 #define ASM_BYTE_OP "\t.byte\t" 139 #define ASM_SHORT "\t.word\t" 140 #define ASM_LONG "\t.long\t" 141 #define ASM_QUAD "\t.quad\t" 142 143 #define SUBTARGET_ENCODE_SECTION_INFO darwin_encode_section_info 144 145 #undef ASM_OUTPUT_ALIGN 146 #define ASM_OUTPUT_ALIGN(FILE,LOG) \ 147 do { if ((LOG) != 0) \ 148 { \ 149 if (in_section == text_section) \ 150 fprintf (FILE, "\t%s %d,0x90\n", ALIGN_ASM_OP, (LOG)); \ 151 else \ 152 fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG)); \ 153 } \ 154 } while (0) 155 156 /* This says how to output an assembler line 157 to define a global common symbol. */ 158 159 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \ 160 ( fputs (".comm ", (FILE)), \ 161 assemble_name ((FILE), (NAME)), \ 162 fprintf ((FILE), ",%lu\n", (unsigned long)(ROUNDED))) 163 164 /* This says how to output an assembler line 165 to define a local common symbol. */ 166 167 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \ 168 ( fputs (".lcomm ", (FILE)), \ 169 assemble_name ((FILE), (NAME)), \ 170 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", (ROUNDED))) 171 172 /* Darwin profiling -- call mcount. */ 173 #undef FUNCTION_PROFILER 174 #define FUNCTION_PROFILER(FILE, LABELNO) \ 175 do { \ 176 if (MACHOPIC_INDIRECT && !TARGET_64BIT) \ 177 { \ 178 const char *name = machopic_mcount_stub_name (); \ 179 fprintf (FILE, "\tcall %s\n", name+1); /* skip '&' */ \ 180 machopic_validate_stub_or_non_lazy_ptr (name); \ 181 } \ 182 else fprintf (FILE, "\tcall mcount\n"); \ 183 } while (0) 184 185 #define C_COMMON_OVERRIDE_OPTIONS \ 186 do { \ 187 SUBTARGET_C_COMMON_OVERRIDE_OPTIONS; \ 188 } while (0) 189 190 /* Darwin on x86_64 uses dwarf-2 by default. */ 191 #undef PREFERRED_DEBUGGING_TYPE 192 #define PREFERRED_DEBUGGING_TYPE (TARGET_64BIT ? DWARF2_DEBUG : DBX_DEBUG) 193 194 /* Darwin uses the standard DWARF register numbers but the default 195 register numbers for STABS. Fortunately for 64-bit code the 196 default and the standard are the same. */ 197 #undef DBX_REGISTER_NUMBER 198 #define DBX_REGISTER_NUMBER(n) \ 199 (TARGET_64BIT ? dbx64_register_map[n] \ 200 : write_symbols == DWARF2_DEBUG ? svr4_dbx_register_map[n] \ 201 : dbx_register_map[n]) 202 203 /* Unfortunately, the 32-bit EH information also doesn't use the standard 204 DWARF register numbers. */ 205 #define DWARF2_FRAME_REG_OUT(n, for_eh) \ 206 (! (for_eh) || write_symbols != DWARF2_DEBUG || TARGET_64BIT ? (n) \ 207 : (n) == 5 ? 4 \ 208 : (n) == 4 ? 5 \ 209 : (n) >= 11 && (n) <= 18 ? (n) + 1 \ 210 : (n)) 211 212 #undef REGISTER_TARGET_PRAGMAS 213 #define REGISTER_TARGET_PRAGMAS() DARWIN_REGISTER_TARGET_PRAGMAS() 214 215 #undef TARGET_SET_DEFAULT_TYPE_ATTRIBUTES 216 #define TARGET_SET_DEFAULT_TYPE_ATTRIBUTES darwin_set_default_type_attributes 217 218 /* For 64-bit, we need to add 4 because @GOTPCREL is relative to the 219 end of the instruction, but without the 4 we'd only have the right 220 address for the start of the instruction. */ 221 #undef ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX 222 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \ 223 if (TARGET_64BIT) \ 224 { \ 225 if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_pcrel) \ 226 { \ 227 fputs (ASM_LONG, FILE); \ 228 assemble_name (FILE, XSTR (ADDR, 0)); \ 229 fputs ("+4@GOTPCREL", FILE); \ 230 goto DONE; \ 231 } \ 232 } \ 233 else \ 234 { \ 235 if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1)) \ 236 { \ 237 darwin_non_lazy_pcrel (FILE, ADDR); \ 238 goto DONE; \ 239 } \ 240 } 241 242 /* This needs to move since i386 uses the first flag and other flags are 243 used in Mach-O. */ 244 #undef MACHO_SYMBOL_FLAG_VARIABLE 245 #define MACHO_SYMBOL_FLAG_VARIABLE ((SYMBOL_FLAG_MACH_DEP) << 3) 246