1 /* Target definitions for x86 running Darwin. 2 Copyright (C) 2001-2018 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 We default to 64b for single-arch builds, so apply this unconditionally. */ 52 #undef REAL_LIBGCC_SPEC 53 #define REAL_LIBGCC_SPEC \ 54 "%{static-libgcc|static: \ 55 %:version-compare(>= 10.6 mmacosx-version-min= -lSystem) \ 56 -lgcc_eh -lgcc; \ 57 shared-libgcc|fexceptions|fgnu-runtime: \ 58 %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_s.10.4) \ 59 %:version-compare(>< 10.5 10.6 mmacosx-version-min= -lgcc_s.10.5) \ 60 %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_ext.10.4) \ 61 %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_ext.10.5) \ 62 -lgcc ; \ 63 :%:version-compare(>< 10.3.9 10.5 mmacosx-version-min= -lgcc_s.10.4) \ 64 %:version-compare(>< 10.5 10.6 mmacosx-version-min= -lgcc_s.10.5) \ 65 %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_ext.10.4) \ 66 %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_ext.10.5) \ 67 -lgcc }" 68 69 /* Size of the Obj-C jump buffer. */ 70 #define OBJC_JBLEN ((TARGET_64BIT) ? ((9 * 2) + 3 + 16) : (18)) 71 72 #undef TARGET_FPMATH_DEFAULT 73 #define TARGET_FPMATH_DEFAULT (TARGET_SSE ? FPMATH_SSE : FPMATH_387) 74 75 #define TARGET_OS_CPP_BUILTINS() \ 76 do \ 77 { \ 78 builtin_define ("__LITTLE_ENDIAN__"); \ 79 darwin_cpp_builtins (pfile); \ 80 } \ 81 while (0) 82 83 #undef PTRDIFF_TYPE 84 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int") 85 86 #undef WCHAR_TYPE 87 #define WCHAR_TYPE "int" 88 89 #undef WCHAR_TYPE_SIZE 90 #define WCHAR_TYPE_SIZE 32 91 92 /* Generate pic symbol indirection stubs if this is true. */ 93 #undef TARGET_MACHO_SYMBOL_STUBS 94 #define TARGET_MACHO_SYMBOL_STUBS (darwin_symbol_stubs) 95 96 /* For compatibility with OSX system tools, use the new style of pic stub 97 if this is set (default). */ 98 #undef MACHOPIC_ATT_STUB 99 #define MACHOPIC_ATT_STUB (darwin_macho_att_stub) 100 101 #undef MAX_BITS_PER_WORD 102 #define MAX_BITS_PER_WORD 64 103 104 #undef FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN 105 #define FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN (0) 106 107 #undef TARGET_KEEPS_VECTOR_ALIGNED_STACK 108 #define TARGET_KEEPS_VECTOR_ALIGNED_STACK 1 109 110 /* On Darwin, the stack is 128-bit aligned at the point of every call. 111 Failure to ensure this will lead to a crash in the system libraries 112 or dynamic loader. */ 113 114 #undef MAIN_STACK_BOUNDARY 115 #define MAIN_STACK_BOUNDARY 128 116 117 /* Since we'll never want a stack boundary less aligned than 128 bits 118 we need the extra work here otherwise bits of gcc get very grumpy 119 when we ask for lower alignment. We could just reject values less 120 than 128 bits for Darwin, but it's easier to up the alignment if 121 it's below the minimum. */ 122 #undef PREFERRED_STACK_BOUNDARY 123 #define PREFERRED_STACK_BOUNDARY \ 124 MAX (128, ix86_preferred_stack_boundary) 125 126 /* We want -fPIC by default, unless we're using -static to compile for 127 the kernel or some such. */ 128 129 #undef CC1_SPEC 130 #define CC1_SPEC "%(cc1_cpu) \ 131 %{!mkernel:%{!static:%{!mdynamic-no-pic:-fPIC}}} \ 132 %{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }} \ 133 %{mx32:%eDarwin is not an mx32 platform}" \ 134 DARWIN_CC1_SPEC 135 136 #undef ASM_SPEC 137 #define ASM_SPEC "-arch %(darwin_arch) \ 138 " ASM_OPTIONS " -force_cpusubtype_ALL \ 139 %{static}" ASM_MMACOSX_VERSION_MIN_SPEC 140 141 #undef ENDFILE_SPEC 142 #define ENDFILE_SPEC \ 143 "%{Ofast|ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \ 144 %{mpc32:crtprec32.o%s} \ 145 %{mpc64:crtprec64.o%s} \ 146 %{mpc80:crtprec80.o%s}" TM_DESTRUCTOR 147 148 /* We default to x86_64 for single-arch builds, bi-arch overrides. */ 149 #define DARWIN_ARCH_SPEC "x86_64" 150 151 #undef SUBTARGET_EXTRA_SPECS 152 #define SUBTARGET_EXTRA_SPECS \ 153 DARWIN_EXTRA_SPECS \ 154 { "darwin_arch", DARWIN_ARCH_SPEC }, \ 155 { "darwin_crt2", "" }, \ 156 { "darwin_subarch", DARWIN_ARCH_SPEC }, 157 158 /* The Darwin assembler mostly follows AT&T syntax. */ 159 #undef ASSEMBLER_DIALECT 160 #define ASSEMBLER_DIALECT ASM_ATT 161 162 /* Define macro used to output shift-double opcodes when the shift 163 count is in %cl. Some assemblers require %cl as an argument; 164 some don't. This macro controls what to do: by default, don't 165 print %cl. */ 166 167 #define SHIFT_DOUBLE_OMITS_COUNT 0 168 169 #undef TARGET_ASM_FILE_END 170 #define TARGET_ASM_FILE_END darwin_file_end 171 172 /* Define the syntax of pseudo-ops, labels and comments. */ 173 174 /* String containing the assembler's comment-starter. */ 175 176 #define ASM_COMMENT_START "#" 177 178 /* By default, target has a 80387, uses IEEE compatible arithmetic, 179 and returns float values in the 387. */ 180 181 #undef TARGET_SUBTARGET_DEFAULT 182 #define TARGET_SUBTARGET_DEFAULT (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_128BIT_LONG_DOUBLE) 183 184 /* For darwin we want to target specific processor features as a minimum, 185 but these unfortunately don't correspond to a specific processor. */ 186 #undef TARGET_SUBTARGET32_ISA_DEFAULT 187 #define TARGET_SUBTARGET32_ISA_DEFAULT (OPTION_MASK_ISA_MMX \ 188 | OPTION_MASK_ISA_SSE \ 189 | OPTION_MASK_ISA_SSE2 \ 190 | OPTION_MASK_ISA_SSE3) 191 192 #undef TARGET_SUBTARGET64_ISA_DEFAULT 193 #define TARGET_SUBTARGET64_ISA_DEFAULT TARGET_SUBTARGET32_ISA_DEFAULT 194 195 #undef GOT_SYMBOL_NAME 196 #define GOT_SYMBOL_NAME MACHOPIC_FUNCTION_BASE_NAME 197 198 /* Define the syntax of pseudo-ops, labels and comments. */ 199 200 #define LPREFIX "L" 201 202 /* Assembler pseudos to introduce constants of various size. */ 203 204 #define ASM_BYTE "\t.byte\t" 205 #define ASM_SHORT "\t.word\t" 206 #define ASM_LONG "\t.long\t" 207 #define ASM_QUAD "\t.quad\t" 208 209 #define SUBTARGET_ENCODE_SECTION_INFO darwin_encode_section_info 210 211 #undef ASM_OUTPUT_ALIGN 212 #define ASM_OUTPUT_ALIGN(FILE,LOG) \ 213 do { if ((LOG) != 0) \ 214 { \ 215 if (in_section == text_section) \ 216 fprintf (FILE, "\t%s %d,0x90\n", ALIGN_ASM_OP, (LOG)); \ 217 else \ 218 fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG)); \ 219 } \ 220 } while (0) 221 222 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN 223 #define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \ 224 do { \ 225 if ((LOG) != 0) { \ 226 if ((MAX_SKIP) == 0 || (MAX_SKIP) >= (1 << (LOG)) - 1) \ 227 fprintf ((FILE), "\t.p2align %d\n", (LOG)); \ 228 else \ 229 fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \ 230 } \ 231 } while (0) 232 #endif 233 234 /* Darwin x86 assemblers support the .ident directive. */ 235 236 #undef TARGET_ASM_OUTPUT_IDENT 237 #define TARGET_ASM_OUTPUT_IDENT default_asm_output_ident_directive 238 239 /* Darwin profiling -- call mcount. */ 240 #undef FUNCTION_PROFILER 241 #define FUNCTION_PROFILER(FILE, LABELNO) \ 242 do { \ 243 if (TARGET_MACHO_SYMBOL_STUBS \ 244 && MACHOPIC_INDIRECT && !TARGET_64BIT) \ 245 { \ 246 const char *name = machopic_mcount_stub_name (); \ 247 fprintf (FILE, "\tcall %s\n", name+1); /* skip '&' */ \ 248 machopic_validate_stub_or_non_lazy_ptr (name); \ 249 } \ 250 else fprintf (FILE, "\tcall mcount\n"); \ 251 } while (0) 252 253 #define C_COMMON_OVERRIDE_OPTIONS \ 254 do { \ 255 SUBTARGET_C_COMMON_OVERRIDE_OPTIONS; \ 256 } while (0) 257 258 #undef SUBTARGET_OVERRIDE_OPTIONS 259 #define SUBTARGET_OVERRIDE_OPTIONS \ 260 do { \ 261 if (TARGET_64BIT && MACHO_DYNAMIC_NO_PIC_P) \ 262 target_flags &= ~MASK_MACHO_DYNAMIC_NO_PIC; \ 263 } while (0) 264 265 /* Darwin on x86_64 uses dwarf-2 by default. Pre-darwin9 32-bit 266 compiles default to stabs+. darwin9+ defaults to dwarf-2. */ 267 #ifndef DARWIN_PREFER_DWARF 268 #undef PREFERRED_DEBUGGING_TYPE 269 #ifdef HAVE_AS_STABS_DIRECTIVE 270 #define PREFERRED_DEBUGGING_TYPE (TARGET_64BIT ? DWARF2_DEBUG : DBX_DEBUG) 271 #else 272 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG 273 #endif 274 #endif 275 276 /* Darwin uses the standard DWARF register numbers but the default 277 register numbers for STABS. Fortunately for 64-bit code the 278 default and the standard are the same. */ 279 #undef DBX_REGISTER_NUMBER 280 #define DBX_REGISTER_NUMBER(n) \ 281 (TARGET_64BIT ? dbx64_register_map[n] \ 282 : write_symbols == DWARF2_DEBUG ? svr4_dbx_register_map[n] \ 283 : dbx_register_map[n]) 284 285 /* Unfortunately, the 32-bit EH information also doesn't use the standard 286 DWARF register numbers. */ 287 #define DWARF2_FRAME_REG_OUT(n, for_eh) \ 288 (! (for_eh) || write_symbols != DWARF2_DEBUG || TARGET_64BIT ? (n) \ 289 : (n) == 5 ? 4 \ 290 : (n) == 4 ? 5 \ 291 : (n) >= 11 && (n) <= 18 ? (n) + 1 \ 292 : (n)) 293 294 #undef REGISTER_SUBTARGET_PRAGMAS 295 #define REGISTER_SUBTARGET_PRAGMAS() DARWIN_REGISTER_TARGET_PRAGMAS() 296 297 #undef TARGET_SET_DEFAULT_TYPE_ATTRIBUTES 298 #define TARGET_SET_DEFAULT_TYPE_ATTRIBUTES darwin_set_default_type_attributes 299 300 /* For 64-bit, we need to add 4 because @GOTPCREL is relative to the 301 end of the instruction, but without the 4 we'd only have the right 302 address for the start of the instruction. */ 303 #undef ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX 304 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \ 305 if (TARGET_64BIT) \ 306 { \ 307 if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_pcrel) \ 308 { \ 309 fputs (ASM_LONG, FILE); \ 310 assemble_name (FILE, XSTR (ADDR, 0)); \ 311 fputs ("+4@GOTPCREL", FILE); \ 312 goto DONE; \ 313 } \ 314 } \ 315 else \ 316 { \ 317 if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1)) \ 318 { \ 319 darwin_non_lazy_pcrel (FILE, ADDR); \ 320 goto DONE; \ 321 } \ 322 } 323 324 /* First available SYMBOL flag bit for use by subtargets. */ 325 #define SYMBOL_FLAG_SUBT_DEP (SYMBOL_FLAG_MACH_DEP << 5) 326 327 #undef MACHOPIC_NL_SYMBOL_PTR_SECTION 328 #define MACHOPIC_NL_SYMBOL_PTR_SECTION \ 329 ".section __IMPORT,__pointers,non_lazy_symbol_pointers" 330 331 #define SUBTARGET32_DEFAULT_CPU "i686" 332 333 #undef SUBTARGET_INIT_BUILTINS 334 #define SUBTARGET_INIT_BUILTINS \ 335 do { \ 336 ix86_builtins[(int) IX86_BUILTIN_CFSTRING] \ 337 = darwin_init_cfstring_builtins ((unsigned) (IX86_BUILTIN_CFSTRING)); \ 338 darwin_rename_builtins (); \ 339 } while(0) 340