darwin.h revision 146895
1/* Target definitions for PowerPC running Darwin (Mac OS X). 2 Copyright (C) 1997, 2000, 2001, 2003, 2004 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 it 8 under the terms of the GNU General Public License as published 9 by the Free Software Foundation; either version 2, or (at your 10 option) any later version. 11 12 GCC is distributed in the hope that it will be useful, but WITHOUT 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 15 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 the 19 Free Software Foundation, 59 Temple Place - Suite 330, Boston, 20 MA 02111-1307, USA. */ 21 22#undef TARGET_VERSION 23#define TARGET_VERSION fprintf (stderr, " (Darwin/PowerPC)"); 24 25/* The "Darwin ABI" is mostly like AIX, but with some key differences. */ 26 27#define DEFAULT_ABI ABI_DARWIN 28 29/* The object file format is Mach-O. */ 30 31#define TARGET_OBJECT_FORMAT OBJECT_MACHO 32 33/* We're not ever going to do TOCs. */ 34 35#define TARGET_TOC 0 36#define TARGET_NO_TOC 1 37 38/* Darwin switches. */ 39/* Use dynamic-no-pic codegen (no picbase reg; not suitable for shlibs.) */ 40#define MASK_MACHO_DYNAMIC_NO_PIC 0x00800000 41 42#define TARGET_DYNAMIC_NO_PIC (target_flags & MASK_MACHO_DYNAMIC_NO_PIC) 43 44/* Handle #pragma weak and #pragma pack. */ 45#define HANDLE_SYSV_PRAGMA 1 46 47 48#define TARGET_OS_CPP_BUILTINS() \ 49 do \ 50 { \ 51 builtin_define ("__ppc__"); \ 52 builtin_define ("__POWERPC__"); \ 53 builtin_define ("__NATURAL_ALIGNMENT__"); \ 54 builtin_define ("__MACH__"); \ 55 builtin_define ("__APPLE__"); \ 56 } \ 57 while (0) 58 59 60/* */ 61#undef SUBTARGET_SWITCHES 62#define SUBTARGET_SWITCHES \ 63 {"dynamic-no-pic", MASK_MACHO_DYNAMIC_NO_PIC, \ 64 N_("Generate code suitable for executables (NOT shared libs)")}, \ 65 {"no-dynamic-no-pic", -MASK_MACHO_DYNAMIC_NO_PIC, ""}, 66 67 68/* The Darwin ABI always includes AltiVec, can't be (validly) turned 69 off. */ 70 71#define SUBTARGET_OVERRIDE_OPTIONS \ 72do { \ 73 rs6000_altivec_abi = 1; \ 74 rs6000_altivec_vrsave = 1; \ 75 if (DEFAULT_ABI == ABI_DARWIN) \ 76 { \ 77 if (MACHO_DYNAMIC_NO_PIC_P) \ 78 { \ 79 if (flag_pic) \ 80 warning ("-mdynamic-no-pic overrides -fpic or -fPIC"); \ 81 flag_pic = 0; \ 82 } \ 83 else if (flag_pic == 1) \ 84 { \ 85 /* Darwin doesn't support -fpic. */ \ 86 warning ("-fpic is not supported; -fPIC assumed"); \ 87 flag_pic = 2; \ 88 } \ 89 } \ 90}while(0) 91 92/* We want -fPIC by default, unless we're using -static to compile for 93 the kernel or some such. */ 94 95 96#define CC1_SPEC "\ 97%{gused: -feliminate-unused-debug-symbols %<gused }\ 98%{static: %{Zdynamic: %e conflicting code gen style switches are used}}\ 99%{!static:%{!mdynamic-no-pic:-fPIC}}" 100 101/* It's virtually impossible to predict all the possible combinations 102 of -mcpu and -maltivec and whatnot, so just supply 103 -force_cpusubtype_ALL if any are seen. Radar 3492132 against the 104 assembler is asking for a .machine directive so we could get this 105 really right. */ 106#define ASM_SPEC "-arch ppc \ 107 %{Zforce_cpusubtype_ALL:-force_cpusubtype_ALL} \ 108 %{!Zforce_cpusubtype_ALL:%{maltivec|mcpu=*|mpowerpc64:-force_cpusubtype_ALL}}" 109 110#undef SUBTARGET_EXTRA_SPECS 111#define SUBTARGET_EXTRA_SPECS \ 112 { "darwin_arch", "ppc" }, 113 114/* The "-faltivec" option should have been called "-maltivec" all along. */ 115#define SUBTARGET_OPTION_TRANSLATE_TABLE \ 116 { "-faltivec", "-maltivec -include altivec.h" }, \ 117 { "-fno-altivec", "-mno-altivec" }, \ 118 { "-Waltivec-long-deprecated", "-mwarn-altivec-long" }, \ 119 { "-Wno-altivec-long-deprecated", "-mno-warn-altivec-long" } 120 121/* Make both r2 and r3 available for allocation. */ 122#define FIXED_R2 0 123#define FIXED_R13 0 124 125/* Base register for access to local variables of the function. */ 126 127#undef FRAME_POINTER_REGNUM 128#define FRAME_POINTER_REGNUM 30 129 130#undef RS6000_PIC_OFFSET_TABLE_REGNUM 131#define RS6000_PIC_OFFSET_TABLE_REGNUM 31 132 133/* Pad the outgoing args area to 16 bytes instead of the usual 8. */ 134 135#undef STARTING_FRAME_OFFSET 136#define STARTING_FRAME_OFFSET \ 137 (RS6000_ALIGN (current_function_outgoing_args_size, 16) \ 138 + RS6000_VARARGS_AREA \ 139 + RS6000_SAVE_AREA) 140 141#undef STACK_DYNAMIC_OFFSET 142#define STACK_DYNAMIC_OFFSET(FUNDECL) \ 143 (RS6000_ALIGN (current_function_outgoing_args_size, 16) \ 144 + (STACK_POINTER_OFFSET)) 145 146/* These are used by -fbranch-probabilities */ 147#define HOT_TEXT_SECTION_NAME "__TEXT,__text,regular,pure_instructions" 148#define UNLIKELY_EXECUTED_TEXT_SECTION_NAME \ 149 "__TEXT,__text2,regular,pure_instructions" 150 151/* Define cutoff for using external functions to save floating point. 152 Currently on Darwin, always use inline stores. */ 153 154#undef FP_SAVE_INLINE 155#define FP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) < 64) 156 157/* The assembler wants the alternate register names, but without 158 leading percent sign. */ 159#undef REGISTER_NAMES 160#define REGISTER_NAMES \ 161{ \ 162 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \ 163 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \ 164 "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", \ 165 "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", \ 166 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \ 167 "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \ 168 "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", \ 169 "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", \ 170 "mq", "lr", "ctr", "ap", \ 171 "cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7", \ 172 "xer", \ 173 "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", \ 174 "v8", "v9", "v10", "v11", "v12", "v13", "v14", "v15", \ 175 "v16", "v17", "v18", "v19", "v20", "v21", "v22", "v23", \ 176 "v24", "v25", "v26", "v27", "v28", "v29", "v30", "v31", \ 177 "vrsave", "vscr", \ 178 "spe_acc", "spefscr" \ 179} 180 181/* This outputs NAME to FILE. */ 182 183#undef RS6000_OUTPUT_BASENAME 184#define RS6000_OUTPUT_BASENAME(FILE, NAME) \ 185 assemble_name (FILE, NAME) 186 187/* Globalizing directive for a label. */ 188#undef GLOBAL_ASM_OP 189#define GLOBAL_ASM_OP "\t.globl " 190#undef TARGET_ASM_GLOBALIZE_LABEL 191 192/* This is how to output an internal label prefix. rs6000.c uses this 193 when generating traceback tables. */ 194/* Not really used for Darwin? */ 195 196#undef ASM_OUTPUT_INTERNAL_LABEL_PREFIX 197#define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX) \ 198 fprintf (FILE, "%s", PREFIX) 199 200/* This says how to output an assembler line to define a global common 201 symbol. */ 202/* ? */ 203#undef ASM_OUTPUT_ALIGNED_COMMON 204#define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \ 205 do { fputs (".comm ", (FILE)); \ 206 RS6000_OUTPUT_BASENAME ((FILE), (NAME)); \ 207 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n",\ 208 (SIZE)); } while (0) 209 210/* Override the standard rs6000 definition. */ 211 212#undef ASM_COMMENT_START 213#define ASM_COMMENT_START ";" 214 215/* FP save and restore routines. */ 216#define SAVE_FP_PREFIX "._savef" 217#define SAVE_FP_SUFFIX "" 218#define RESTORE_FP_PREFIX "._restf" 219#define RESTORE_FP_SUFFIX "" 220 221/* This is how to output an assembler line that says to advance 222 the location counter to a multiple of 2**LOG bytes using the 223 "nop" instruction as padding. */ 224 225#define ASM_OUTPUT_ALIGN_WITH_NOP(FILE,LOG) \ 226 do \ 227 { \ 228 if ((LOG) < 3) \ 229 { \ 230 ASM_OUTPUT_ALIGN (FILE,LOG); \ 231 } \ 232 else /* nop == ori r0,r0,0 */ \ 233 fprintf (FILE, "\t.align32 %d,0x60000000\n", (LOG)); \ 234 } while (0) 235 236/* Generate insns to call the profiler. */ 237 238#define PROFILE_HOOK(LABEL) output_profile_hook (LABEL) 239 240/* Function name to call to do profiling. */ 241 242#define RS6000_MCOUNT "*mcount" 243 244/* Default processor: a G4. */ 245 246#undef PROCESSOR_DEFAULT 247#define PROCESSOR_DEFAULT PROCESSOR_PPC7400 248 249/* Default target flag settings. Despite the fact that STMW/LMW 250 serializes, it's still a big code size win to use them. Use FSEL by 251 default as well. */ 252 253#undef TARGET_DEFAULT 254#define TARGET_DEFAULT (MASK_POWERPC | MASK_MULTIPLE | MASK_NEW_MNEMONICS \ 255 | MASK_PPC_GFXOPT) 256 257/* Since Darwin doesn't do TOCs, stub this out. */ 258 259#define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE) 0 260 261/* Unlike most other PowerPC targets, chars are signed, for 262 consistency with other Darwin architectures. */ 263 264#undef DEFAULT_SIGNED_CHAR 265#define DEFAULT_SIGNED_CHAR (1) 266 267/* Given an rtx X being reloaded into a reg required to be 268 in class CLASS, return the class of reg to actually use. 269 In general this is just CLASS; but on some machines 270 in some cases it is preferable to use a more restrictive class. 271 272 On the RS/6000, we have to return NO_REGS when we want to reload a 273 floating-point CONST_DOUBLE to force it to be copied to memory. 274 275 Don't allow R0 when loading the address of, or otherwise furtling with, 276 a SYMBOL_REF. */ 277 278#undef PREFERRED_RELOAD_CLASS 279#define PREFERRED_RELOAD_CLASS(X,CLASS) \ 280 ((GET_CODE (X) == CONST_DOUBLE \ 281 && GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT) \ 282 ? NO_REGS \ 283 : ((GET_CODE (X) == SYMBOL_REF || GET_CODE (X) == HIGH) \ 284 && reg_class_subset_p (BASE_REGS, (CLASS))) \ 285 ? BASE_REGS \ 286 : (GET_MODE_CLASS (GET_MODE (X)) == MODE_INT \ 287 && (CLASS) == NON_SPECIAL_REGS) \ 288 ? GENERAL_REGS \ 289 : (CLASS)) 290 291/* Fix for emit_group_load (): force large constants to be pushed via regs. */ 292#define ALWAYS_PUSH_CONSTS_USING_REGS_P 1 293 294/* This now supports a natural alignment mode */ 295/* Darwin word-aligns FP doubles but doubleword-aligns 64-bit ints. */ 296#define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \ 297 (TARGET_ALIGN_NATURAL ? (COMPUTED) : \ 298 (TYPE_MODE (TREE_CODE (TREE_TYPE (FIELD)) == ARRAY_TYPE \ 299 ? get_inner_array_type (FIELD) \ 300 : TREE_TYPE (FIELD)) == DFmode \ 301 ? MIN ((COMPUTED), 32) : (COMPUTED))) 302 303/* Darwin increases natural record alignment to doubleword if the first 304 field is an FP double while the FP fields remain word aligned. */ 305#define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED) \ 306 ((TREE_CODE (STRUCT) == RECORD_TYPE \ 307 || TREE_CODE (STRUCT) == UNION_TYPE \ 308 || TREE_CODE (STRUCT) == QUAL_UNION_TYPE) \ 309 && TARGET_ALIGN_NATURAL == 0 \ 310 ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED) \ 311 : (TARGET_ALTIVEC && TREE_CODE (STRUCT) == VECTOR_TYPE) \ 312 ? MAX (MAX ((COMPUTED), (SPECIFIED)), 128) \ 313 : MAX ((COMPUTED), (SPECIFIED))) 314 315/* XXX: Darwin supports neither .quad, or .llong, but it also doesn't 316 support 64 bit PowerPC either, so this just keeps things happy. */ 317#define DOUBLE_INT_ASM_OP "\t.quad\t" 318 319/* Get HOST_WIDE_INT and CONST_INT to be 32 bits, for compile time 320 space/speed. */ 321#undef MAX_LONG_TYPE_SIZE 322#define MAX_LONG_TYPE_SIZE 32 323 324/* For binary compatibility with 2.95; Darwin C APIs use bool from 325 stdbool.h, which was an int-sized enum in 2.95. */ 326#define BOOL_TYPE_SIZE INT_TYPE_SIZE 327 328#undef REGISTER_TARGET_PRAGMAS 329#define REGISTER_TARGET_PRAGMAS DARWIN_REGISTER_TARGET_PRAGMAS 330 331