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 \
177 { "darwin_arch", DARWIN_ARCH_SPEC }, \
178 { "darwin_crt2", DARWIN_CRT2_SPEC }, \
179 { "darwin_subarch", DARWIN_SUBARCH_SPEC },
181 /* Output a .machine directive. */
182 #undef TARGET_ASM_FILE_START
183 #define TARGET_ASM_FILE_START rs6000_darwin_file_start
185 /* The "-faltivec" option should have been called "-maltivec" all
186 along. -ffix-and-continue and -findirect-data is for compatibility
187 for old compilers. */
189 #define SUBTARGET_OPTION_TRANSLATE_TABLE \
190 { "-ffix-and-continue", "-mfix-and-continue" }, \
191 { "-findirect-data", "-mfix-and-continue" }, \
192 { "-faltivec", "-maltivec -include altivec.h" }, \
193 { "-fno-altivec", "-mno-altivec" }, \
194 { "-Waltivec-long-deprecated", "-mwarn-altivec-long" }, \
195 { "-Wno-altivec-long-deprecated", "-mno-warn-altivec-long" }
197 /* Make both r2 and r13 available for allocation. */
201 /* Base register for access to local variables of the function. */
203 #undef HARD_FRAME_POINTER_REGNUM
204 #define HARD_FRAME_POINTER_REGNUM 30
206 #undef RS6000_PIC_OFFSET_TABLE_REGNUM
207 #define RS6000_PIC_OFFSET_TABLE_REGNUM 31
209 /* Pad the outgoing args area to 16 bytes instead of the usual 8. */
211 #undef STARTING_FRAME_OFFSET
212 #define STARTING_FRAME_OFFSET \
213 (FRAME_GROWS_DOWNWARD \
215 : (RS6000_ALIGN (current_function_outgoing_args_size, 16) \
218 #undef STACK_DYNAMIC_OFFSET
219 #define STACK_DYNAMIC_OFFSET(FUNDECL) \
220 (RS6000_ALIGN (current_function_outgoing_args_size, 16) \
221 + (STACK_POINTER_OFFSET))
223 /* These are used by -fbranch-probabilities */
224 #define HOT_TEXT_SECTION_NAME "__TEXT,__text,regular,pure_instructions"
225 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME \
226 "__TEXT,__unlikely,regular,pure_instructions"
228 /* Define cutoff for using external functions to save floating point.
229 Currently on Darwin, always use inline stores. */
231 #undef FP_SAVE_INLINE
232 #define FP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) < 64)
234 /* Darwin uses a function call if everything needs to be saved/restored. */
236 #define WORLD_SAVE_P(INFO) ((INFO)->world_save_p)
238 /* The assembler wants the alternate register names, but without
239 leading percent sign. */
240 #undef REGISTER_NAMES
241 #define REGISTER_NAMES \
243 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
244 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
245 "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", \
246 "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", \
247 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
248 "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
249 "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", \
250 "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", \
251 "mq", "lr", "ctr", "ap", \
252 "cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7", \
254 "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", \
255 "v8", "v9", "v10", "v11", "v12", "v13", "v14", "v15", \
256 "v16", "v17", "v18", "v19", "v20", "v21", "v22", "v23", \
257 "v24", "v25", "v26", "v27", "v28", "v29", "v30", "v31", \
259 "spe_acc", "spefscr", \
263 /* This outputs NAME to FILE. */
265 #undef RS6000_OUTPUT_BASENAME
266 #define RS6000_OUTPUT_BASENAME(FILE, NAME) \
267 assemble_name (FILE, NAME)
269 /* Globalizing directive for a label. */
271 #define GLOBAL_ASM_OP "\t.globl "
272 #undef TARGET_ASM_GLOBALIZE_LABEL
274 /* This is how to output an internal label prefix. rs6000.c uses this
275 when generating traceback tables. */
276 /* Not really used for Darwin? */
278 #undef ASM_OUTPUT_INTERNAL_LABEL_PREFIX
279 #define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX) \
280 fprintf (FILE, "%s", PREFIX)
282 /* This says how to output an assembler line to define a global common
285 #undef ASM_OUTPUT_ALIGNED_COMMON
286 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \
288 unsigned HOST_WIDE_INT _new_size = SIZE; \
289 fputs (".comm ", (FILE)); \
290 RS6000_OUTPUT_BASENAME ((FILE), (NAME)); \
291 if (_new_size == 0) _new_size = 1; \
292 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", _new_size); \
295 /* Override the standard rs6000 definition. */
297 #undef ASM_COMMENT_START
298 #define ASM_COMMENT_START ";"
300 /* FP save and restore routines. */
301 #define SAVE_FP_PREFIX "._savef"
302 #define SAVE_FP_SUFFIX ""
303 #define RESTORE_FP_PREFIX "._restf"
304 #define RESTORE_FP_SUFFIX ""
306 /* This is how to output an assembler line that says to advance
307 the location counter to a multiple of 2**LOG bytes using the
308 "nop" instruction as padding. */
310 #define ASM_OUTPUT_ALIGN_WITH_NOP(FILE,LOG) \
315 ASM_OUTPUT_ALIGN (FILE,LOG); \
317 else /* nop == ori r0,r0,0 */ \
318 fprintf (FILE, "\t.align32 %d,0x60000000\n", (LOG)); \
321 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
322 /* This is supported in cctools 465 and later. The macro test
323 above prevents using it in earlier build environments. */
324 #define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \
327 if ((MAX_SKIP) == 0) \
328 fprintf ((FILE), "\t.p2align %d\n", (LOG)); \
330 fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
334 /* Generate insns to call the profiler. */
336 #define PROFILE_HOOK(LABEL) output_profile_hook (LABEL)
338 /* Function name to call to do profiling. */
340 #define RS6000_MCOUNT "*mcount"
342 /* Default processor: G4, and G5 for 64-bit. */
344 #undef PROCESSOR_DEFAULT
345 #define PROCESSOR_DEFAULT PROCESSOR_PPC7400
346 #undef PROCESSOR_DEFAULT64
347 #define PROCESSOR_DEFAULT64 PROCESSOR_POWER4
349 /* Default target flag settings. Despite the fact that STMW/LMW
350 serializes, it's still a big code size win to use them. Use FSEL by
353 #undef TARGET_DEFAULT
354 #define TARGET_DEFAULT (MASK_POWERPC | MASK_MULTIPLE | MASK_NEW_MNEMONICS \
357 /* Darwin only runs on PowerPC, so short-circuit POWER patterns. */
359 #define TARGET_POWER 0
360 #undef TARGET_IEEEQUAD
361 #define TARGET_IEEEQUAD 0
363 /* Since Darwin doesn't do TOCs, stub this out. */
365 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE) ((void)X, (void)MODE, 0)
367 /* Unlike most other PowerPC targets, chars are signed, for
368 consistency with other Darwin architectures. */
370 #undef DEFAULT_SIGNED_CHAR
371 #define DEFAULT_SIGNED_CHAR (1)
373 /* Given an rtx X being reloaded into a reg required to be
374 in class CLASS, return the class of reg to actually use.
375 In general this is just CLASS; but on some machines
376 in some cases it is preferable to use a more restrictive class.
378 On the RS/6000, we have to return NO_REGS when we want to reload a
379 floating-point CONST_DOUBLE to force it to be copied to memory.
381 Don't allow R0 when loading the address of, or otherwise furtling with,
384 #undef PREFERRED_RELOAD_CLASS
385 #define PREFERRED_RELOAD_CLASS(X,CLASS) \
387 && reg_classes_intersect_p ((CLASS), FLOAT_REGS)) \
389 : ((GET_CODE (X) == SYMBOL_REF || GET_CODE (X) == HIGH) \
390 && reg_class_subset_p (BASE_REGS, (CLASS))) \
392 : (GET_MODE_CLASS (GET_MODE (X)) == MODE_INT \
393 && (CLASS) == NON_SPECIAL_REGS) \
397 /* Fix for emit_group_load (): force large constants to be pushed via regs. */
398 #define ALWAYS_PUSH_CONSTS_USING_REGS_P 1
400 /* Compute field alignment. This is similar to the version of the
401 macro in the Apple version of GCC, except that version supports
402 'mac68k' alignment, and that version uses the computed alignment
403 always for the first field of a structure. The first-field
404 behaviour is dealt with by
405 darwin_rs6000_special_round_type_align. */
406 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
407 (TARGET_ALIGN_NATURAL ? (COMPUTED) \
408 : (COMPUTED) == 128 ? 128 \
409 : MIN ((COMPUTED), 32))
411 /* Darwin increases natural record alignment to doubleword if the first
412 field is an FP double while the FP fields remain word aligned. */
413 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED) \
414 ((TREE_CODE (STRUCT) == RECORD_TYPE \
415 || TREE_CODE (STRUCT) == UNION_TYPE \
416 || TREE_CODE (STRUCT) == QUAL_UNION_TYPE) \
417 && TARGET_ALIGN_NATURAL == 0 \
418 ? darwin_rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED) \
419 : (TREE_CODE (STRUCT) == VECTOR_TYPE \
420 && ALTIVEC_VECTOR_MODE (TYPE_MODE (STRUCT))) \
421 ? MAX (MAX ((COMPUTED), (SPECIFIED)), 128) \
422 : MAX ((COMPUTED), (SPECIFIED)))
424 /* Specify padding for the last element of a block move between
425 registers and memory. FIRST is nonzero if this is the only
427 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
428 (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
430 /* XXX: Darwin supports neither .quad, or .llong, but it also doesn't
431 support 64 bit PowerPC either, so this just keeps things happy. */
432 #define DOUBLE_INT_ASM_OP "\t.quad\t"
434 /* For binary compatibility with 2.95; Darwin C APIs use bool from
435 stdbool.h, which was an int-sized enum in 2.95. Users can explicitly
436 choose to have sizeof(bool)==1 with the -mone-byte-bool switch. */
437 #define BOOL_TYPE_SIZE (darwin_one_byte_bool ? CHAR_TYPE_SIZE : INT_TYPE_SIZE)
439 #undef REGISTER_TARGET_PRAGMAS
440 #define REGISTER_TARGET_PRAGMAS() \
443 DARWIN_REGISTER_TARGET_PRAGMAS(); \
444 targetm.resolve_overloaded_builtin = altivec_resolve_overloaded_builtin; \
453 #define MD_UNWIND_SUPPORT "config/rs6000/darwin-unwind.h"
456 #define HAS_MD_FALLBACK_FRAME_STATE_FOR 1
458 /* True, iff we're generating fast turn around debugging code. When
459 true, we arrange for function prologues to start with 5 nops so
460 that gdb may insert code to redirect them, and for data to be
461 accessed indirectly. The runtime uses this indirection to forward
462 references for data to the original instance of that data. */
464 #define TARGET_FIX_AND_CONTINUE (darwin_fix_and_continue)
466 /* This is the reserved direct dispatch address for Objective-C. */
467 #define OFFS_MSGSEND_FAST 0xFFFEFF00
469 /* This is the reserved ivar address Objective-C. */
470 #define OFFS_ASSIGNIVAR_FAST 0xFFFEFEC0
472 /* Old versions of Mac OS/Darwin don't have C99 functions available. */
473 #undef TARGET_C99_FUNCTIONS
474 #define TARGET_C99_FUNCTIONS \
476 || (darwin_macosx_version_min \
477 && strverscmp (darwin_macosx_version_min, "10.3") >= 0))
479 /* When generating kernel code or kexts, we don't use Altivec by
480 default, as kernel code doesn't save/restore those registers. */
481 #define OS_MISSING_ALTIVEC (flag_mkernel || flag_apple_kext)