1 /* Target definitions for x86 running Darwin. 2 Copyright (C) 2001-2020 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 #define TARGET_64BIT TARGET_ISA_64BIT 30 #undef TARGET_64BIT_P 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 #undef TARGET_FPMATH_DEFAULT_P 75 #define TARGET_FPMATH_DEFAULT_P(x) \ 76 (TARGET_SSE_P(x) ? FPMATH_SSE : FPMATH_387) 77 78 #define TARGET_OS_CPP_BUILTINS() \ 79 do { \ 80 builtin_define ("__LITTLE_ENDIAN__"); \ 81 darwin_cpp_builtins (pfile); \ 82 } while (0) 83 84 #undef PTRDIFF_TYPE 85 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int") 86 87 #undef WCHAR_TYPE 88 #define WCHAR_TYPE "int" 89 90 #undef WCHAR_TYPE_SIZE 91 #define WCHAR_TYPE_SIZE 32 92 93 /* Generate pic symbol indirection stubs if this is true. */ 94 #undef TARGET_MACHO_SYMBOL_STUBS 95 #define TARGET_MACHO_SYMBOL_STUBS (darwin_symbol_stubs) 96 97 /* For compatibility with OSX system tools, use the new style of pic stub 98 if this is set (default). */ 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. */ 114 115 #undef MAIN_STACK_BOUNDARY 116 #define MAIN_STACK_BOUNDARY 128 117 118 /* Since we'll never want a stack boundary less aligned than 128 bits 119 we need the extra work here otherwise bits of gcc get very grumpy 120 when we ask for lower alignment. We could just reject values less 121 than 128 bits for Darwin, but it's easier to up the alignment if 122 it's below the minimum. */ 123 #undef PREFERRED_STACK_BOUNDARY 124 #define PREFERRED_STACK_BOUNDARY \ 125 MAX (128, ix86_preferred_stack_boundary) 126 127 /* We want -fPIC by default, unless we're using -static to compile for 128 the kernel or some such. */ 129 130 #undef CC1_SPEC 131 #define CC1_SPEC "%(cc1_cpu) \ 132 %{!mkernel:%{!static:%{!mdynamic-no-pic:-fPIC}}} \ 133 %{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }} \ 134 %{mx32:%eDarwin is not an mx32 platform} \ 135 %{mfentry*:%eDarwin does not support -mfentry or associated options}" \ 136 DARWIN_CC1_SPEC 137 138 #undef ASM_SPEC 139 #define ASM_SPEC "-arch %(darwin_arch) \ 140 " ASM_OPTIONS " -force_cpusubtype_ALL \ 141 %{static}" ASM_MMACOSX_VERSION_MIN_SPEC 142 143 #undef ENDFILE_SPEC 144 #define ENDFILE_SPEC \ 145 "%{Ofast|ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \ 146 %{mpc32:crtprec32.o%s} \ 147 %{mpc64:crtprec64.o%s} \ 148 %{mpc80:crtprec80.o%s}" TM_DESTRUCTOR 149 150 /* We default to x86_64 for single-arch builds, bi-arch overrides. */ 151 #define DARWIN_ARCH_SPEC "x86_64" 152 153 #undef SUBTARGET_EXTRA_SPECS 154 #define SUBTARGET_EXTRA_SPECS \ 155 DARWIN_EXTRA_SPECS \ 156 { "darwin_arch", DARWIN_ARCH_SPEC }, \ 157 { "darwin_crt2", "" }, \ 158 { "darwin_subarch", DARWIN_ARCH_SPEC }, 159 160 /* The Darwin assembler mostly follows AT&T syntax. */ 161 #undef ASSEMBLER_DIALECT 162 #define ASSEMBLER_DIALECT ASM_ATT 163 164 /* Define macro used to output shift-double opcodes when the shift 165 count is in %cl. Some assemblers require %cl as an argument; 166 some don't. This macro controls what to do: by default, don't 167 print %cl. */ 168 169 #define SHIFT_DOUBLE_OMITS_COUNT 0 170 171 #undef TARGET_ASM_FILE_END 172 #define TARGET_ASM_FILE_END darwin_file_end 173 174 /* Define the syntax of pseudo-ops, labels and comments. */ 175 176 /* String containing the assembler's comment-starter. */ 177 178 #define ASM_COMMENT_START "#" 179 180 /* By default, target has a 80387, uses IEEE compatible arithmetic, 181 and returns float values in the 387. */ 182 183 #undef TARGET_SUBTARGET_DEFAULT 184 #define TARGET_SUBTARGET_DEFAULT \ 185 (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_128BIT_LONG_DOUBLE) 186 187 /* For darwin we want to target specific processor features as a minimum, 188 but these unfortunately don't correspond to a specific processor. */ 189 #undef TARGET_SUBTARGET32_ISA_DEFAULT 190 #define TARGET_SUBTARGET32_ISA_DEFAULT \ 191 (OPTION_MASK_ISA_MMX | OPTION_MASK_ISA_SSE \ 192 | OPTION_MASK_ISA_SSE2 | OPTION_MASK_ISA_SSE3) 193 194 #undef TARGET_SUBTARGET64_ISA_DEFAULT 195 #define TARGET_SUBTARGET64_ISA_DEFAULT TARGET_SUBTARGET32_ISA_DEFAULT 196 197 #undef GOT_SYMBOL_NAME 198 #define GOT_SYMBOL_NAME MACHOPIC_FUNCTION_BASE_NAME 199 200 /* Define the syntax of pseudo-ops, labels and comments. */ 201 202 #define LPREFIX "L" 203 204 /* Assembler pseudos to introduce constants of various size. */ 205 206 #define ASM_BYTE "\t.byte\t" 207 #define ASM_SHORT "\t.word\t" 208 #define ASM_LONG "\t.long\t" 209 #define ASM_QUAD "\t.quad\t" 210 211 #define SUBTARGET_ENCODE_SECTION_INFO darwin_encode_section_info 212 213 #undef ASM_OUTPUT_ALIGN 214 #define ASM_OUTPUT_ALIGN(FILE,LOG) \ 215 do { \ 216 if ((LOG) != 0) \ 217 { \ 218 if (in_section == text_section) \ 219 fprintf (FILE, "\t%s %d,0x90\n", ALIGN_ASM_OP, (LOG)); \ 220 else \ 221 fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG)); \ 222 } \ 223 } while (0) 224 225 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN 226 #define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \ 227 do { \ 228 if ((LOG) != 0) { \ 229 if ((MAX_SKIP) == 0 || (MAX_SKIP) >= (1 << (LOG)) - 1) \ 230 fprintf ((FILE), "\t.p2align %d\n", (LOG)); \ 231 else \ 232 fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \ 233 } \ 234 } while (0) 235 #endif 236 237 /* Darwin x86 assemblers support the .ident directive. */ 238 239 #undef TARGET_ASM_OUTPUT_IDENT 240 #define TARGET_ASM_OUTPUT_IDENT default_asm_output_ident_directive 241 242 /* We always want jump tables in the text section: 243 * for PIC code, we need the subtracted symbol to be defined at 244 assembly-time. 245 * for mdynamic-no-pic, we cannot support jump tables in the .const 246 section for weak functions, this looks to ld64 like direct access 247 to the weak symbol from an anonymous atom. */ 248 249 #undef JUMP_TABLES_IN_TEXT_SECTION 250 #define JUMP_TABLES_IN_TEXT_SECTION 1 251 252 /* Darwin profiling -- call mcount. 253 If we need a stub, then we unconditionally mark it as used. */ 254 #undef FUNCTION_PROFILER 255 #define FUNCTION_PROFILER(FILE, LABELNO) \ 256 do { \ 257 if (TARGET_MACHO_SYMBOL_STUBS \ 258 && MACHOPIC_INDIRECT && !TARGET_64BIT) \ 259 { \ 260 const char *name = machopic_mcount_stub_name (); \ 261 fprintf (FILE, "\tcall %s\n", name+1); /* skip '&' */ \ 262 } \ 263 else fprintf (FILE, "\tcall mcount\n"); \ 264 } while (0) 265 266 #define C_COMMON_OVERRIDE_OPTIONS \ 267 do { \ 268 SUBTARGET_C_COMMON_OVERRIDE_OPTIONS; \ 269 } while (0) 270 271 #undef SUBTARGET_OVERRIDE_OPTIONS 272 #define SUBTARGET_OVERRIDE_OPTIONS \ 273 do { \ 274 if (TARGET_64BIT && MACHO_DYNAMIC_NO_PIC_P) \ 275 target_flags &= ~MASK_MACHO_DYNAMIC_NO_PIC; \ 276 } while (0) 277 278 /* Darwin on x86_64 uses dwarf-2 by default. Pre-darwin9 32-bit 279 compiles default to stabs+. darwin9+ defaults to dwarf-2. */ 280 #ifndef DARWIN_PREFER_DWARF 281 #undef PREFERRED_DEBUGGING_TYPE 282 #ifdef HAVE_AS_STABS_DIRECTIVE 283 #define PREFERRED_DEBUGGING_TYPE (TARGET_64BIT ? DWARF2_DEBUG : DBX_DEBUG) 284 #else 285 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG 286 #endif 287 #endif 288 289 /* Darwin uses the standard DWARF register numbers but the default 290 register numbers for STABS. Fortunately for 64-bit code the 291 default and the standard are the same. */ 292 #undef DBX_REGISTER_NUMBER 293 #define DBX_REGISTER_NUMBER(n) \ 294 (TARGET_64BIT ? dbx64_register_map[n] \ 295 : write_symbols == DWARF2_DEBUG ? svr4_dbx_register_map[n] \ 296 : dbx_register_map[n]) 297 298 /* Unfortunately, the 32-bit EH information also doesn't use the standard 299 DWARF register numbers. */ 300 #define DWARF2_FRAME_REG_OUT(n, for_eh) \ 301 (! (for_eh) || write_symbols != DWARF2_DEBUG || TARGET_64BIT ? (n) \ 302 : (n) == 5 ? 4 \ 303 : (n) == 4 ? 5 \ 304 : (n) >= 11 && (n) <= 18 ? (n) + 1 \ 305 : (n)) 306 307 #undef REGISTER_SUBTARGET_PRAGMAS 308 #define REGISTER_SUBTARGET_PRAGMAS() DARWIN_REGISTER_TARGET_PRAGMAS() 309 310 #undef TARGET_SET_DEFAULT_TYPE_ATTRIBUTES 311 #define TARGET_SET_DEFAULT_TYPE_ATTRIBUTES darwin_set_default_type_attributes 312 313 /* For 64-bit, we need to add 4 because @GOTPCREL is relative to the 314 end of the instruction, but without the 4 we'd only have the right 315 address for the start of the instruction. */ 316 #undef ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX 317 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \ 318 if (TARGET_64BIT) \ 319 { \ 320 if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_pcrel) \ 321 { \ 322 fputs (ASM_LONG, FILE); \ 323 assemble_name (FILE, XSTR (ADDR, 0)); \ 324 fputs ("+4@GOTPCREL", FILE); \ 325 goto DONE; \ 326 } \ 327 } \ 328 else \ 329 { \ 330 if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1)) \ 331 { \ 332 darwin_non_lazy_pcrel (FILE, ADDR); \ 333 goto DONE; \ 334 } \ 335 } 336 337 /* First available SYMBOL flag bit for use by subtargets. */ 338 #define SYMBOL_FLAG_SUBT_DEP (SYMBOL_FLAG_MACH_DEP << 5) 339 340 #undef MACHOPIC_NL_SYMBOL_PTR_SECTION 341 #define MACHOPIC_NL_SYMBOL_PTR_SECTION \ 342 ".section __IMPORT,__pointers,non_lazy_symbol_pointers" 343 344 #define SUBTARGET32_DEFAULT_CPU "i686" 345 346 #undef SUBTARGET_INIT_BUILTINS 347 #define SUBTARGET_INIT_BUILTINS \ 348 do { \ 349 ix86_builtins[(int) IX86_BUILTIN_CFSTRING] \ 350 = darwin_init_cfstring_builtins ((unsigned) (IX86_BUILTIN_CFSTRING)); \ 351 darwin_rename_builtins (); \ 352 } while(0) 353