1 /* Target definitions for PowerPC running Darwin (Mac OS X).
2 Copyright (C) 1997, 2000, 2001, 2003, 2004, 2005, 2006
3 Free Software Foundation, Inc.
4 Contributed by Apple Computer Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published
10 by the Free Software Foundation; either version 2, or (at your
11 option) any later version.
13 GCC is distributed in the hope that it will be useful, but WITHOUT
14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
16 License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to the
20 Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
21 MA 02110-1301, USA. */
24 #define TARGET_VERSION fprintf (stderr, " (Darwin/PowerPC)");
26 /* The "Darwin ABI" is mostly like AIX, but with some key differences. */
28 #define DEFAULT_ABI ABI_DARWIN
33 #define TARGET_64BIT 1
35 #define TARGET_64BIT 0
39 /* The object file format is Mach-O. */
41 #define TARGET_OBJECT_FORMAT OBJECT_MACHO
43 /* Size of the Obj-C jump buffer. */
44 #define OBJC_JBLEN ((TARGET_64BIT) ? (26*2 + 18*2 + 129 + 1) : (26 + 18*2 + 129 + 1))
46 /* We're not ever going to do TOCs. */
49 #define TARGET_NO_TOC 1
51 /* Override the default rs6000 definition. */
53 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
55 /* Translate config/rs6000/darwin.opt to config/darwin.h. */
56 #define TARGET_DYNAMIC_NO_PIC (TARGET_MACHO_DYNAMIC_NO_PIC)
58 #define TARGET_OS_CPP_BUILTINS() \
61 if (!TARGET_64BIT) builtin_define ("__ppc__"); \
62 if (TARGET_64BIT) builtin_define ("__ppc64__"); \
63 builtin_define ("__POWERPC__"); \
64 builtin_define ("__NATURAL_ALIGNMENT__"); \
65 darwin_cpp_builtins (pfile); \
70 #define SUBTARGET_OVERRIDE_OPTIONS \
72 /* The Darwin ABI always includes AltiVec, can't be (validly) turned \
74 rs6000_altivec_abi = 1; \
75 TARGET_ALTIVEC_VRSAVE = 1; \
76 if (DEFAULT_ABI == ABI_DARWIN) \
78 if (MACHO_DYNAMIC_NO_PIC_P) \
81 warning (0, "-mdynamic-no-pic overrides -fpic or -fPIC"); \
84 else if (flag_pic == 1) \
89 if (TARGET_64BIT && ! TARGET_POWERPC64) \
91 target_flags |= MASK_POWERPC64; \
92 warning (0, "-m64 requires PowerPC64 architecture, enabling"); \
96 rs6000_default_long_calls = 1; \
97 target_flags |= MASK_SOFT_FLOAT; \
100 /* Make -m64 imply -maltivec. Darwin's 64-bit ABI includes \
102 if (!flag_mkernel && !flag_apple_kext \
104 && ! (target_flags_explicit & MASK_ALTIVEC)) \
105 target_flags |= MASK_ALTIVEC; \
107 /* Unless the user (not the configurer) has explicitly overridden \
108 it with -mcpu=G3 or -mno-altivec, then 10.5+ targets default to \
109 G4 unless targetting the kernel. */ \
111 && !flag_apple_kext \
112 && darwin_macosx_version_min \
113 && strverscmp (darwin_macosx_version_min, "10.5") >= 0 \
114 && ! (target_flags_explicit & MASK_ALTIVEC) \
115 && ! rs6000_select[1].string) \
117 target_flags |= MASK_ALTIVEC; \
121 #define C_COMMON_OVERRIDE_OPTIONS do { \
122 /* On powerpc, __cxa_get_exception_ptr is available starting in the \
123 10.4.6 libstdc++.dylib. */ \
124 if ((! darwin_macosx_version_min \
125 || strverscmp (darwin_macosx_version_min, "10.4.6") < 0) \
126 && flag_use_cxa_get_exception_ptr == 2) \
127 flag_use_cxa_get_exception_ptr = 0; \
129 flag_no_builtin = 1; \
130 SUBTARGET_C_COMMON_OVERRIDE_OPTIONS; \
133 /* Darwin has 128-bit long double support in libc in 10.4 and later.
134 Default to 128-bit long doubles even on earlier platforms for ABI
135 consistency; arithmetic will work even if libc and libm support is
138 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
141 /* We want -fPIC by default, unless we're using -static to compile for
142 the kernel or some such. */
145 %{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }} \
146 %{static: %{Zdynamic: %e conflicting code gen style switches are used}}\
147 %{!mkernel:%{!static:%{!mdynamic-no-pic:-fPIC}}}"
149 #define DARWIN_ARCH_SPEC "%{m64:ppc64;:ppc}"
151 #define DARWIN_SUBARCH_SPEC " \
166 mcpu=power4:ppc970; \
170 /* crt2.o is at least partially required for 10.3.x and earlier. */
171 #define DARWIN_CRT2_SPEC \
172 "%{!m64:%:version-compare(!> 10.4 mmacosx-version-min= crt2.o%s)}"
174 #undef SUBTARGET_EXTRA_SPECS
175 #define SUBTARGET_EXTRA_SPECS \
176 { "darwin_arch", DARWIN_ARCH_SPEC }, \
177 { "darwin_crt2", DARWIN_CRT2_SPEC }, \
178 { "darwin_subarch", DARWIN_SUBARCH_SPEC },
180 /* Output a .machine directive. */
181 #undef TARGET_ASM_FILE_START
182 #define TARGET_ASM_FILE_START rs6000_darwin_file_start
184 /* The "-faltivec" option should have been called "-maltivec" all
185 along. -ffix-and-continue and -findirect-data is for compatibility
186 for old compilers. */
188 #define SUBTARGET_OPTION_TRANSLATE_TABLE \
189 { "-ffix-and-continue", "-mfix-and-continue" }, \
190 { "-findirect-data", "-mfix-and-continue" }, \
191 { "-faltivec", "-maltivec -include altivec.h" }, \
192 { "-fno-altivec", "-mno-altivec" }, \
193 { "-Waltivec-long-deprecated", "-mwarn-altivec-long" }, \
194 { "-Wno-altivec-long-deprecated", "-mno-warn-altivec-long" }
196 /* Make both r2 and r13 available for allocation. */
200 /* Base register for access to local variables of the function. */
202 #undef HARD_FRAME_POINTER_REGNUM
203 #define HARD_FRAME_POINTER_REGNUM 30
205 #undef RS6000_PIC_OFFSET_TABLE_REGNUM
206 #define RS6000_PIC_OFFSET_TABLE_REGNUM 31
208 /* Pad the outgoing args area to 16 bytes instead of the usual 8. */
210 #undef STARTING_FRAME_OFFSET
211 #define STARTING_FRAME_OFFSET \
212 (FRAME_GROWS_DOWNWARD \
214 : (RS6000_ALIGN (current_function_outgoing_args_size, 16) \
217 #undef STACK_DYNAMIC_OFFSET
218 #define STACK_DYNAMIC_OFFSET(FUNDECL) \
219 (RS6000_ALIGN (current_function_outgoing_args_size, 16) \
220 + (STACK_POINTER_OFFSET))
222 /* These are used by -fbranch-probabilities */
223 #define HOT_TEXT_SECTION_NAME "__TEXT,__text,regular,pure_instructions"
224 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME \
225 "__TEXT,__unlikely,regular,pure_instructions"
227 /* Define cutoff for using external functions to save floating point.
228 Currently on Darwin, always use inline stores. */
230 #undef FP_SAVE_INLINE
231 #define FP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) < 64)
233 /* Darwin uses a function call if everything needs to be saved/restored. */
235 #define WORLD_SAVE_P(INFO) ((INFO)->world_save_p)
237 /* The assembler wants the alternate register names, but without
238 leading percent sign. */
239 #undef REGISTER_NAMES
240 #define REGISTER_NAMES \
242 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
243 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
244 "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", \
245 "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", \
246 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
247 "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
248 "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", \
249 "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", \
250 "mq", "lr", "ctr", "ap", \
251 "cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7", \
253 "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", \
254 "v8", "v9", "v10", "v11", "v12", "v13", "v14", "v15", \
255 "v16", "v17", "v18", "v19", "v20", "v21", "v22", "v23", \
256 "v24", "v25", "v26", "v27", "v28", "v29", "v30", "v31", \
258 "spe_acc", "spefscr", \
262 /* This outputs NAME to FILE. */
264 #undef RS6000_OUTPUT_BASENAME
265 #define RS6000_OUTPUT_BASENAME(FILE, NAME) \
266 assemble_name (FILE, NAME)
268 /* Globalizing directive for a label. */
270 #define GLOBAL_ASM_OP "\t.globl "
271 #undef TARGET_ASM_GLOBALIZE_LABEL
273 /* This is how to output an internal label prefix. rs6000.c uses this
274 when generating traceback tables. */
275 /* Not really used for Darwin? */
277 #undef ASM_OUTPUT_INTERNAL_LABEL_PREFIX
278 #define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX) \
279 fprintf (FILE, "%s", PREFIX)
281 /* This says how to output an assembler line to define a global common
283 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \
285 unsigned HOST_WIDE_INT _new_size = SIZE; \
286 fputs (".comm ", (FILE)); \
287 RS6000_OUTPUT_BASENAME ((FILE), (NAME)); \
288 if (_new_size == 0) _new_size = 1; \
289 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", _new_size); \
292 /* Override the standard rs6000 definition. */
294 #undef ASM_COMMENT_START
295 #define ASM_COMMENT_START ";"
297 /* FP save and restore routines. */
298 #define SAVE_FP_PREFIX "._savef"
299 #define SAVE_FP_SUFFIX ""
300 #define RESTORE_FP_PREFIX "._restf"
301 #define RESTORE_FP_SUFFIX ""
303 /* This is how to output an assembler line that says to advance
304 the location counter to a multiple of 2**LOG bytes using the
305 "nop" instruction as padding. */
307 #define ASM_OUTPUT_ALIGN_WITH_NOP(FILE,LOG) \
312 ASM_OUTPUT_ALIGN (FILE,LOG); \
314 else /* nop == ori r0,r0,0 */ \
315 fprintf (FILE, "\t.align32 %d,0x60000000\n", (LOG)); \
318 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
319 /* This is supported in cctools 465 and later. The macro test
320 above prevents using it in earlier build environments. */
321 #define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \
324 if ((MAX_SKIP) == 0) \
325 fprintf ((FILE), "\t.p2align %d\n", (LOG)); \
327 fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
331 /* Generate insns to call the profiler. */
333 #define PROFILE_HOOK(LABEL) output_profile_hook (LABEL)
335 /* Function name to call to do profiling. */
337 #define RS6000_MCOUNT "*mcount"
339 /* Default processor: G4, and G5 for 64-bit. */
341 #undef PROCESSOR_DEFAULT
342 #define PROCESSOR_DEFAULT PROCESSOR_PPC7400
343 #undef PROCESSOR_DEFAULT64
344 #define PROCESSOR_DEFAULT64 PROCESSOR_POWER4
346 /* Default target flag settings. Despite the fact that STMW/LMW
347 serializes, it's still a big code size win to use them. Use FSEL by
350 #undef TARGET_DEFAULT
351 #define TARGET_DEFAULT (MASK_POWERPC | MASK_MULTIPLE | MASK_NEW_MNEMONICS \
354 /* Darwin only runs on PowerPC, so short-circuit POWER patterns. */
356 #define TARGET_POWER 0
357 #undef TARGET_IEEEQUAD
358 #define TARGET_IEEEQUAD 0
360 /* Since Darwin doesn't do TOCs, stub this out. */
362 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE) ((void)X, (void)MODE, 0)
364 /* Unlike most other PowerPC targets, chars are signed, for
365 consistency with other Darwin architectures. */
367 #undef DEFAULT_SIGNED_CHAR
368 #define DEFAULT_SIGNED_CHAR (1)
370 /* Given an rtx X being reloaded into a reg required to be
371 in class CLASS, return the class of reg to actually use.
372 In general this is just CLASS; but on some machines
373 in some cases it is preferable to use a more restrictive class.
375 On the RS/6000, we have to return NO_REGS when we want to reload a
376 floating-point CONST_DOUBLE to force it to be copied to memory.
378 Don't allow R0 when loading the address of, or otherwise furtling with,
381 #undef PREFERRED_RELOAD_CLASS
382 #define PREFERRED_RELOAD_CLASS(X,CLASS) \
384 && reg_classes_intersect_p ((CLASS), FLOAT_REGS)) \
386 : ((GET_CODE (X) == SYMBOL_REF || GET_CODE (X) == HIGH) \
387 && reg_class_subset_p (BASE_REGS, (CLASS))) \
389 : (GET_MODE_CLASS (GET_MODE (X)) == MODE_INT \
390 && (CLASS) == NON_SPECIAL_REGS) \
394 /* Fix for emit_group_load (): force large constants to be pushed via regs. */
395 #define ALWAYS_PUSH_CONSTS_USING_REGS_P 1
397 /* This now supports a natural alignment mode */
398 /* Darwin word-aligns FP doubles but doubleword-aligns 64-bit ints. */
399 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
400 (TARGET_ALIGN_NATURAL ? (COMPUTED) : \
401 (TYPE_MODE (TREE_CODE (TREE_TYPE (FIELD)) == ARRAY_TYPE \
402 ? get_inner_array_type (FIELD) \
403 : TREE_TYPE (FIELD)) == DFmode \
404 ? MIN ((COMPUTED), 32) : (COMPUTED)))
406 /* Darwin increases natural record alignment to doubleword if the first
407 field is an FP double while the FP fields remain word aligned. */
408 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED) \
409 ((TREE_CODE (STRUCT) == RECORD_TYPE \
410 || TREE_CODE (STRUCT) == UNION_TYPE \
411 || TREE_CODE (STRUCT) == QUAL_UNION_TYPE) \
412 && TARGET_ALIGN_NATURAL == 0 \
413 ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED) \
414 : (TREE_CODE (STRUCT) == VECTOR_TYPE \
415 && ALTIVEC_VECTOR_MODE (TYPE_MODE (STRUCT))) \
416 ? MAX (MAX ((COMPUTED), (SPECIFIED)), 128) \
417 : MAX ((COMPUTED), (SPECIFIED)))
419 /* Specify padding for the last element of a block move between
420 registers and memory. FIRST is nonzero if this is the only
422 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
423 (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
425 /* XXX: Darwin supports neither .quad, or .llong, but it also doesn't
426 support 64 bit PowerPC either, so this just keeps things happy. */
427 #define DOUBLE_INT_ASM_OP "\t.quad\t"
429 /* For binary compatibility with 2.95; Darwin C APIs use bool from
430 stdbool.h, which was an int-sized enum in 2.95. Users can explicitly
431 choose to have sizeof(bool)==1 with the -mone-byte-bool switch. */
432 #define BOOL_TYPE_SIZE (darwin_one_byte_bool ? CHAR_TYPE_SIZE : INT_TYPE_SIZE)
434 #undef REGISTER_TARGET_PRAGMAS
435 #define REGISTER_TARGET_PRAGMAS() \
438 DARWIN_REGISTER_TARGET_PRAGMAS(); \
439 targetm.resolve_overloaded_builtin = altivec_resolve_overloaded_builtin; \
447 #define MD_UNWIND_SUPPORT "config/rs6000/darwin-unwind.h"
449 #define HAS_MD_FALLBACK_FRAME_STATE_FOR 1
451 /* True, iff we're generating fast turn around debugging code. When
452 true, we arrange for function prologues to start with 5 nops so
453 that gdb may insert code to redirect them, and for data to be
454 accessed indirectly. The runtime uses this indirection to forward
455 references for data to the original instance of that data. */
457 #define TARGET_FIX_AND_CONTINUE (darwin_fix_and_continue)
459 /* This is the reserved direct dispatch address for Objective-C. */
460 #define OFFS_MSGSEND_FAST 0xFFFEFF00
462 /* This is the reserved ivar address Objective-C. */
463 #define OFFS_ASSIGNIVAR_FAST 0xFFFEFEC0
465 /* Old versions of Mac OS/Darwin don't have C99 functions available. */
466 #undef TARGET_C99_FUNCTIONS
467 #define TARGET_C99_FUNCTIONS \
469 || (darwin_macosx_version_min \
470 && strverscmp (darwin_macosx_version_min, "10.3") >= 0))
472 /* When generating kernel code or kexts, we don't use Altivec by
473 default, as kernel code doesn't save/restore those registers. */
474 #define OS_MISSING_ALTIVEC (flag_mkernel || flag_apple_kext)