1 /* Target definitions for PowerPC running Darwin (Mac OS X). 2 Copyright (C) 1997, 2000, 2001 Free Software Foundation, Inc. 3 Contributed by Apple Computer Inc. 4 5 This file is part of GNU CC. 6 7 GNU CC 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 GNU CC 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 GNU CC; see the file COPYING. If not, write to 19 the Free Software Foundation, 59 Temple Place - Suite 330, 20 Boston, 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 /* Handle #pragma weak and #pragma pack. */ 39 #define HANDLE_SYSV_PRAGMA 1 40 41 /* The Darwin ABI always includes AltiVec, can't be (validly) turned 42 off. */ 43 44 #define SUBTARGET_OVERRIDE_OPTIONS \ 45 rs6000_altivec_abi = 1; 46 47 #define TARGET_OS_CPP_BUILTINS() \ 48 do \ 49 { \ 50 builtin_define ("__ppc__"); \ 51 builtin_define ("__POWERPC__"); \ 52 builtin_define ("__NATURAL_ALIGNMENT__"); \ 53 builtin_define ("__MACH__"); \ 54 builtin_define ("__APPLE__"); \ 55 } \ 56 while (0) 57 58 /* We want -fPIC by default, unless we're using -static to compile for 59 the kernel or some such. */ 60 61 #define CC1_SPEC "\ 62 %{static: %{Zdynamic: %e conflicting code gen style switches are used}}\ 63 %{!static:-fPIC}" 64 65 /* Make both r2 and r3 available for allocation. */ 66 #define FIXED_R2 0 67 #define FIXED_R13 0 68 69 /* Base register for access to local variables of the function. */ 70 71 #undef FRAME_POINTER_REGNUM 72 #define FRAME_POINTER_REGNUM 30 73 74 #undef RS6000_PIC_OFFSET_TABLE_REGNUM 75 #define RS6000_PIC_OFFSET_TABLE_REGNUM 31 76 77 /* Pad the outgoing args area to 16 bytes instead of the usual 8. */ 78 79 #undef STARTING_FRAME_OFFSET 80 #define STARTING_FRAME_OFFSET \ 81 (RS6000_ALIGN (current_function_outgoing_args_size, 16) \ 82 + RS6000_VARARGS_AREA \ 83 + RS6000_SAVE_AREA) 84 85 #undef STACK_DYNAMIC_OFFSET 86 #define STACK_DYNAMIC_OFFSET(FUNDECL) \ 87 (RS6000_ALIGN (current_function_outgoing_args_size, 16) \ 88 + (STACK_POINTER_OFFSET)) 89 90 /* Define cutoff for using external functions to save floating point. 91 Currently on Darwin, always use inline stores. */ 92 93 #undef FP_SAVE_INLINE 94 #define FP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) < 64) 95 96 /* Always use the "debug" register names, they're what the assembler 97 wants to see. */ 98 99 #undef REGISTER_NAMES 100 #define REGISTER_NAMES DEBUG_REGISTER_NAMES 101 102 /* This outputs NAME to FILE. */ 103 104 #undef RS6000_OUTPUT_BASENAME 105 #define RS6000_OUTPUT_BASENAME(FILE, NAME) \ 106 assemble_name (FILE, NAME); 107 108 /* Globalizing directive for a label. */ 109 #undef GLOBAL_ASM_OP 110 #define GLOBAL_ASM_OP "\t.globl " 111 #undef TARGET_ASM_GLOBALIZE_LABEL 112 113 /* This is how to output an internal label prefix. rs6000.c uses this 114 when generating traceback tables. */ 115 /* Not really used for Darwin? */ 116 117 #undef ASM_OUTPUT_INTERNAL_LABEL_PREFIX 118 #define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX) \ 119 fprintf (FILE, "%s", PREFIX) 120 121 /* This says how to output an assembler line to define a global common 122 symbol. */ 123 /* ? */ 124 #undef ASM_OUTPUT_ALIGNED_COMMON 125 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \ 126 do { fputs (".comm ", (FILE)); \ 127 RS6000_OUTPUT_BASENAME ((FILE), (NAME)); \ 128 fprintf ((FILE), ",%d\n", (SIZE)); } while (0) 129 130 /* Override the standard rs6000 definition. */ 131 132 #undef ASM_COMMENT_START 133 #define ASM_COMMENT_START ";" 134 135 /* FP save and restore routines. */ 136 #define SAVE_FP_PREFIX "._savef" 137 #define SAVE_FP_SUFFIX "" 138 #define RESTORE_FP_PREFIX "._restf" 139 #define RESTORE_FP_SUFFIX "" 140 141 /* This is how to output an assembler line that says to advance 142 the location counter to a multiple of 2**LOG bytes using the 143 "nop" instruction as padding. */ 144 145 #define ASM_OUTPUT_ALIGN_WITH_NOP(FILE,LOG) \ 146 do \ 147 { \ 148 if ((LOG) < 3) \ 149 { \ 150 ASM_OUTPUT_ALIGN (FILE,LOG); \ 151 } \ 152 else /* nop == ori r0,r0,0 */ \ 153 fprintf (FILE, "\t.align32 %d,0x60000000\n", (LOG)); \ 154 } while (0) 155 156 /* Generate insns to call the profiler. */ 157 158 #define PROFILE_HOOK(LABEL) output_profile_hook (LABEL) 159 160 /* Function name to call to do profiling. */ 161 162 #define RS6000_MCOUNT "*mcount" 163 164 /* Default processor: a G4. */ 165 166 #undef PROCESSOR_DEFAULT 167 #define PROCESSOR_DEFAULT PROCESSOR_PPC7400 168 169 /* Default target flag settings. Despite the fact that STMW/LMW 170 serializes, it's still a big codesize win to use them. Use FSEL by 171 default as well. */ 172 173 #undef TARGET_DEFAULT 174 #define TARGET_DEFAULT (MASK_POWERPC | MASK_MULTIPLE | MASK_NEW_MNEMONICS \ 175 | MASK_PPC_GFXOPT) 176 177 /* Since Darwin doesn't do TOCs, stub this out. */ 178 179 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE) 0 180 181 /* Unlike most other PowerPC targets, chars are signed, for 182 consistency with other Darwin architectures. */ 183 184 #undef DEFAULT_SIGNED_CHAR 185 #define DEFAULT_SIGNED_CHAR (1) 186 187 /* Given an rtx X being reloaded into a reg required to be 188 in class CLASS, return the class of reg to actually use. 189 In general this is just CLASS; but on some machines 190 in some cases it is preferable to use a more restrictive class. 191 192 On the RS/6000, we have to return NO_REGS when we want to reload a 193 floating-point CONST_DOUBLE to force it to be copied to memory. 194 195 Don't allow R0 when loading the address of, or otherwise furtling with, 196 a SYMBOL_REF. */ 197 198 #undef PREFERRED_RELOAD_CLASS 199 #define PREFERRED_RELOAD_CLASS(X,CLASS) \ 200 (((GET_CODE (X) == CONST_DOUBLE \ 201 && GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT) \ 202 ? NO_REGS \ 203 : (GET_MODE_CLASS (GET_MODE (X)) == MODE_INT \ 204 && (CLASS) == NON_SPECIAL_REGS) \ 205 ? GENERAL_REGS \ 206 : (GET_CODE (X) == SYMBOL_REF || GET_CODE (X) == HIGH) \ 207 ? BASE_REGS \ 208 : (CLASS))) 209 210 /* Fix for emit_group_load (): force large constants to be pushed via regs. */ 211 #define ALWAYS_PUSH_CONSTS_USING_REGS_P 1 212 213 /* Darwin word-aligns FP doubles but doubleword-aligns 64-bit ints. */ 214 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \ 215 (TYPE_MODE (TREE_CODE (TREE_TYPE (FIELD)) == ARRAY_TYPE \ 216 ? get_inner_array_type (FIELD) \ 217 : TREE_TYPE (FIELD)) == DFmode \ 218 ? MIN ((COMPUTED), 32) : (COMPUTED)) 219 220 /* Darwin increases natural record alignment to doubleword if the first 221 field is an FP double while the FP fields remain word aligned. */ 222 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED) \ 223 ((TREE_CODE (STRUCT) == RECORD_TYPE \ 224 || TREE_CODE (STRUCT) == UNION_TYPE \ 225 || TREE_CODE (STRUCT) == QUAL_UNION_TYPE) \ 226 && TYPE_FIELDS (STRUCT) != 0 \ 227 && DECL_MODE (TYPE_FIELDS (STRUCT)) == DFmode \ 228 ? MAX (MAX ((COMPUTED), (SPECIFIED)), 64) \ 229 : (TARGET_ALTIVEC && TREE_CODE (STRUCT) == VECTOR_TYPE) \ 230 ? MAX (MAX ((COMPUTED), (SPECIFIED)), 128) \ 231 : MAX ((COMPUTED), (SPECIFIED))) 232 233 /* XXX: Darwin supports neither .quad, or .llong, but it also doesn't 234 support 64 bit PowerPC either, so this just keeps things happy. */ 235 #define DOUBLE_INT_ASM_OP "\t.quad\t" 236 237 /* Get HOST_WIDE_INT and CONST_INT to be 32 bits, for compile time 238 space/speed. */ 239 #undef MAX_LONG_TYPE_SIZE 240 #define MAX_LONG_TYPE_SIZE 32 241 242 /* For binary compatibility with 2.95; Darwin C APIs use bool from 243 stdbool.h, which was an int-sized enum in 2.95. */ 244 #define BOOL_TYPE_SIZE INT_TYPE_SIZE 245 246 #undef REGISTER_TARGET_PRAGMAS 247 #define REGISTER_TARGET_PRAGMAS DARWIN_REGISTER_TARGET_PRAGMAS 248