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 /* Size of the Obj-C jump buffer. */ 43 #define OBJC_JBLEN ((TARGET_64BIT) ? ((9 * 2) + 3 + 16) : (18)) 44 45 #undef TARGET_FPMATH_DEFAULT 46 #define TARGET_FPMATH_DEFAULT (TARGET_SSE ? FPMATH_SSE : FPMATH_387) 47 48 #define TARGET_OS_CPP_BUILTINS() \ 49 do \ 50 { \ 51 builtin_define ("__LITTLE_ENDIAN__"); \ 52 darwin_cpp_builtins (pfile); \ 53 } \ 54 while (0) 55 56 #undef PTRDIFF_TYPE 57 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int") 58 59 #undef WCHAR_TYPE 60 #define WCHAR_TYPE "int" 61 62 #undef WCHAR_TYPE_SIZE 63 #define WCHAR_TYPE_SIZE 32 64 65 /* Generate branch islands stubs if this is true. */ 66 extern int darwin_emit_branch_islands; 67 68 #undef TARGET_MACHO_BRANCH_ISLANDS 69 #define TARGET_MACHO_BRANCH_ISLANDS darwin_emit_branch_islands 70 71 /* For compatibility with OSX system tools, use the new style of pic stub 72 if this is set. */ 73 #undef MACHOPIC_ATT_STUB 74 #define MACHOPIC_ATT_STUB (darwin_macho_att_stub) 75 76 #undef MAX_BITS_PER_WORD 77 #define MAX_BITS_PER_WORD 64 78 79 #undef FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN 80 #define FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN (0) 81 82 #undef TARGET_KEEPS_VECTOR_ALIGNED_STACK 83 #define TARGET_KEEPS_VECTOR_ALIGNED_STACK 1 84 85 /* On Darwin, the stack is 128-bit aligned at the point of every call. 86 Failure to ensure this will lead to a crash in the system libraries 87 or dynamic loader. */ 88 #undef STACK_BOUNDARY 89 #define STACK_BOUNDARY \ 90 ((profile_flag || TARGET_64BIT_MS_ABI) ? 128 : BITS_PER_WORD) 91 92 #undef MAIN_STACK_BOUNDARY 93 #define MAIN_STACK_BOUNDARY 128 94 95 /* Since we'll never want a stack boundary less aligned than 128 bits 96 we need the extra work here otherwise bits of gcc get very grumpy 97 when we ask for lower alignment. We could just reject values less 98 than 128 bits for Darwin, but it's easier to up the alignment if 99 it's below the minimum. */ 100 #undef PREFERRED_STACK_BOUNDARY 101 #define PREFERRED_STACK_BOUNDARY \ 102 MAX (128, ix86_preferred_stack_boundary) 103 104 /* We want -fPIC by default, unless we're using -static to compile for 105 the kernel or some such. */ 106 107 #undef CC1_SPEC 108 #define CC1_SPEC "%(cc1_cpu) \ 109 %{!mkernel:%{!static:%{!mdynamic-no-pic:-fPIC}}} \ 110 %{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }} " \ 111 DARWIN_CC1_SPEC 112 113 #undef ASM_SPEC 114 #define ASM_SPEC "-arch %(darwin_arch) \ 115 " ASM_OPTIONS " -force_cpusubtype_ALL \ 116 %{static}" ASM_MMACOSX_VERSION_MIN_SPEC 117 118 #define DARWIN_ARCH_SPEC "%{m64:x86_64;:i386}" 119 #define DARWIN_SUBARCH_SPEC DARWIN_ARCH_SPEC 120 121 #undef ENDFILE_SPEC 122 #define ENDFILE_SPEC \ 123 "%{Ofast|ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \ 124 %{mpc32:crtprec32.o%s} \ 125 %{mpc64:crtprec64.o%s} \ 126 %{mpc80:crtprec80.o%s}" TM_DESTRUCTOR 127 128 #undef SUBTARGET_EXTRA_SPECS 129 #define SUBTARGET_EXTRA_SPECS \ 130 DARWIN_EXTRA_SPECS \ 131 { "darwin_arch", DARWIN_ARCH_SPEC }, \ 132 { "darwin_crt2", "" }, \ 133 { "darwin_subarch", DARWIN_SUBARCH_SPEC }, 134 135 /* The Darwin assembler mostly follows AT&T syntax. */ 136 #undef ASSEMBLER_DIALECT 137 #define ASSEMBLER_DIALECT ASM_ATT 138 139 /* Define macro used to output shift-double opcodes when the shift 140 count is in %cl. Some assemblers require %cl as an argument; 141 some don't. This macro controls what to do: by default, don't 142 print %cl. */ 143 144 #define SHIFT_DOUBLE_OMITS_COUNT 0 145 146 #undef TARGET_ASM_FILE_END 147 #define TARGET_ASM_FILE_END darwin_file_end 148 149 /* Define the syntax of pseudo-ops, labels and comments. */ 150 151 /* String containing the assembler's comment-starter. */ 152 153 #define ASM_COMMENT_START "#" 154 155 /* By default, target has a 80387, uses IEEE compatible arithmetic, 156 and returns float values in the 387. */ 157 158 #undef TARGET_SUBTARGET_DEFAULT 159 #define TARGET_SUBTARGET_DEFAULT (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_128BIT_LONG_DOUBLE) 160 161 /* For darwin we want to target specific processor features as a minimum, 162 but these unfortunately don't correspond to a specific processor. */ 163 #undef TARGET_SUBTARGET32_ISA_DEFAULT 164 #define TARGET_SUBTARGET32_ISA_DEFAULT (OPTION_MASK_ISA_MMX \ 165 | OPTION_MASK_ISA_SSE \ 166 | OPTION_MASK_ISA_SSE2 \ 167 | OPTION_MASK_ISA_SSE3) 168 169 #undef TARGET_SUBTARGET64_ISA_DEFAULT 170 #define TARGET_SUBTARGET64_ISA_DEFAULT TARGET_SUBTARGET32_ISA_DEFAULT 171 172 #undef GOT_SYMBOL_NAME 173 #define GOT_SYMBOL_NAME MACHOPIC_FUNCTION_BASE_NAME 174 175 /* Define the syntax of pseudo-ops, labels and comments. */ 176 177 #define LPREFIX "L" 178 179 /* Assembler pseudos to introduce constants of various size. */ 180 181 #define ASM_BYTE "\t.byte\t" 182 #define ASM_SHORT "\t.word\t" 183 #define ASM_LONG "\t.long\t" 184 #define ASM_QUAD "\t.quad\t" 185 186 #define SUBTARGET_ENCODE_SECTION_INFO darwin_encode_section_info 187 188 #undef ASM_OUTPUT_ALIGN 189 #define ASM_OUTPUT_ALIGN(FILE,LOG) \ 190 do { if ((LOG) != 0) \ 191 { \ 192 if (in_section == text_section) \ 193 fprintf (FILE, "\t%s %d,0x90\n", ALIGN_ASM_OP, (LOG)); \ 194 else \ 195 fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG)); \ 196 } \ 197 } while (0) 198 199 /* Darwin profiling -- call mcount. */ 200 #undef FUNCTION_PROFILER 201 #define FUNCTION_PROFILER(FILE, LABELNO) \ 202 do { \ 203 if (TARGET_MACHO_BRANCH_ISLANDS \ 204 && MACHOPIC_INDIRECT && !TARGET_64BIT) \ 205 { \ 206 const char *name = machopic_mcount_stub_name (); \ 207 fprintf (FILE, "\tcall %s\n", name+1); /* skip '&' */ \ 208 machopic_validate_stub_or_non_lazy_ptr (name); \ 209 } \ 210 else fprintf (FILE, "\tcall mcount\n"); \ 211 } while (0) 212 213 #define C_COMMON_OVERRIDE_OPTIONS \ 214 do { \ 215 SUBTARGET_C_COMMON_OVERRIDE_OPTIONS; \ 216 } while (0) 217 218 #undef SUBTARGET_OVERRIDE_OPTIONS 219 #define SUBTARGET_OVERRIDE_OPTIONS \ 220 do { \ 221 if (TARGET_64BIT && MACHO_DYNAMIC_NO_PIC_P) \ 222 target_flags &= ~MASK_MACHO_DYNAMIC_NO_PIC; \ 223 } while (0) 224 225 /* Darwin on x86_64 uses dwarf-2 by default. Pre-darwin9 32-bit 226 compiles default to stabs+. darwin9+ defaults to dwarf-2. */ 227 #ifndef DARWIN_PREFER_DWARF 228 #undef PREFERRED_DEBUGGING_TYPE 229 #ifdef HAVE_AS_STABS_DIRECTIVE 230 #define PREFERRED_DEBUGGING_TYPE (TARGET_64BIT ? DWARF2_DEBUG : DBX_DEBUG) 231 #else 232 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG 233 #endif 234 #endif 235 236 /* Darwin uses the standard DWARF register numbers but the default 237 register numbers for STABS. Fortunately for 64-bit code the 238 default and the standard are the same. */ 239 #undef DBX_REGISTER_NUMBER 240 #define DBX_REGISTER_NUMBER(n) \ 241 (TARGET_64BIT ? dbx64_register_map[n] \ 242 : write_symbols == DWARF2_DEBUG ? svr4_dbx_register_map[n] \ 243 : dbx_register_map[n]) 244 245 /* Unfortunately, the 32-bit EH information also doesn't use the standard 246 DWARF register numbers. */ 247 #define DWARF2_FRAME_REG_OUT(n, for_eh) \ 248 (! (for_eh) || write_symbols != DWARF2_DEBUG || TARGET_64BIT ? (n) \ 249 : (n) == 5 ? 4 \ 250 : (n) == 4 ? 5 \ 251 : (n) >= 11 && (n) <= 18 ? (n) + 1 \ 252 : (n)) 253 254 #undef REGISTER_SUBTARGET_PRAGMAS 255 #define REGISTER_SUBTARGET_PRAGMAS() DARWIN_REGISTER_TARGET_PRAGMAS() 256 257 #undef TARGET_SET_DEFAULT_TYPE_ATTRIBUTES 258 #define TARGET_SET_DEFAULT_TYPE_ATTRIBUTES darwin_set_default_type_attributes 259 260 /* For 64-bit, we need to add 4 because @GOTPCREL is relative to the 261 end of the instruction, but without the 4 we'd only have the right 262 address for the start of the instruction. */ 263 #undef ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX 264 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \ 265 if (TARGET_64BIT) \ 266 { \ 267 if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_pcrel) \ 268 { \ 269 fputs (ASM_LONG, FILE); \ 270 assemble_name (FILE, XSTR (ADDR, 0)); \ 271 fputs ("+4@GOTPCREL", FILE); \ 272 goto DONE; \ 273 } \ 274 } \ 275 else \ 276 { \ 277 if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1)) \ 278 { \ 279 darwin_non_lazy_pcrel (FILE, ADDR); \ 280 goto DONE; \ 281 } \ 282 } 283 284 /* This needs to move since i386 uses the first flag and other flags are 285 used in Mach-O. */ 286 #undef MACHO_SYMBOL_FLAG_VARIABLE 287 #define MACHO_SYMBOL_FLAG_VARIABLE ((SYMBOL_FLAG_MACH_DEP) << 3) 288 289 #undef MACHOPIC_NL_SYMBOL_PTR_SECTION 290 #define MACHOPIC_NL_SYMBOL_PTR_SECTION \ 291 ".section __IMPORT,__pointers,non_lazy_symbol_pointers" 292 293 #define SUBTARGET32_DEFAULT_CPU "i686" 294 295 #undef SUBTARGET_INIT_BUILTINS 296 #define SUBTARGET_INIT_BUILTINS \ 297 do { \ 298 ix86_builtins[(int) IX86_BUILTIN_CFSTRING] \ 299 = darwin_init_cfstring_builtins ((unsigned) (IX86_BUILTIN_CFSTRING)); \ 300 darwin_rename_builtins (); \ 301 } while(0) 302