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; \
101 #define C_COMMON_OVERRIDE_OPTIONS do { \
102 /* On powerpc, __cxa_get_exception_ptr is available starting in the \
103 10.4.6 libstdc++.dylib. */ \
104 if ((! darwin_macosx_version_min \
105 || strverscmp (darwin_macosx_version_min, "10.4.6") < 0) \
106 && flag_use_cxa_get_exception_ptr == 2) \
107 flag_use_cxa_get_exception_ptr = 0; \
109 flag_no_builtin = 1; \
110 SUBTARGET_C_COMMON_OVERRIDE_OPTIONS; \
113 /* Darwin has 128-bit long double support in libc in 10.4 and later.
114 Default to 128-bit long doubles even on earlier platforms for ABI
115 consistency; arithmetic will work even if libc and libm support is
118 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
121 /* We want -fPIC by default, unless we're using -static to compile for
122 the kernel or some such. */
125 %{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }} \
126 %{static: %{Zdynamic: %e conflicting code gen style switches are used}}\
127 %{!mkernel:%{!static:%{!mdynamic-no-pic:-fPIC}}}"
129 #define DARWIN_ARCH_SPEC "%{m64:ppc64;:ppc}"
131 #define DARWIN_SUBARCH_SPEC " \
146 mcpu=power4:ppc970; \
150 /* crt2.o is at least partially required for 10.3.x and earlier. */
151 #define DARWIN_CRT2_SPEC \
152 "%{!m64:%:version-compare(!> 10.4 mmacosx-version-min= crt2.o%s)}"
154 #undef SUBTARGET_EXTRA_SPECS
155 #define SUBTARGET_EXTRA_SPECS \
157 { "darwin_arch", DARWIN_ARCH_SPEC }, \
158 { "darwin_crt2", DARWIN_CRT2_SPEC }, \
159 { "darwin_subarch", DARWIN_SUBARCH_SPEC },
161 /* Output a .machine directive. */
162 #undef TARGET_ASM_FILE_START
163 #define TARGET_ASM_FILE_START rs6000_darwin_file_start
165 /* The "-faltivec" option should have been called "-maltivec" all
166 along. -ffix-and-continue and -findirect-data is for compatibility
167 for old compilers. */
169 #define SUBTARGET_OPTION_TRANSLATE_TABLE \
170 { "-ffix-and-continue", "-mfix-and-continue" }, \
171 { "-findirect-data", "-mfix-and-continue" }, \
172 { "-faltivec", "-maltivec -include altivec.h" }, \
173 { "-fno-altivec", "-mno-altivec" }, \
174 { "-Waltivec-long-deprecated", "-mwarn-altivec-long" }, \
175 { "-Wno-altivec-long-deprecated", "-mno-warn-altivec-long" }
177 /* Make both r2 and r13 available for allocation. */
181 /* Base register for access to local variables of the function. */
183 #undef HARD_FRAME_POINTER_REGNUM
184 #define HARD_FRAME_POINTER_REGNUM 30
186 #undef RS6000_PIC_OFFSET_TABLE_REGNUM
187 #define RS6000_PIC_OFFSET_TABLE_REGNUM 31
189 /* Pad the outgoing args area to 16 bytes instead of the usual 8. */
191 #undef STARTING_FRAME_OFFSET
192 #define STARTING_FRAME_OFFSET \
193 (FRAME_GROWS_DOWNWARD \
195 : (RS6000_ALIGN (current_function_outgoing_args_size, 16) \
198 #undef STACK_DYNAMIC_OFFSET
199 #define STACK_DYNAMIC_OFFSET(FUNDECL) \
200 (RS6000_ALIGN (current_function_outgoing_args_size, 16) \
201 + (STACK_POINTER_OFFSET))
203 /* These are used by -fbranch-probabilities */
204 #define HOT_TEXT_SECTION_NAME "__TEXT,__text,regular,pure_instructions"
205 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME \
206 "__TEXT,__unlikely,regular,pure_instructions"
208 /* Define cutoff for using external functions to save floating point.
209 Currently on Darwin, always use inline stores. */
211 #undef FP_SAVE_INLINE
212 #define FP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) < 64)
214 /* Darwin uses a function call if everything needs to be saved/restored. */
216 #define WORLD_SAVE_P(INFO) ((INFO)->world_save_p)
218 /* The assembler wants the alternate register names, but without
219 leading percent sign. */
220 #undef REGISTER_NAMES
221 #define REGISTER_NAMES \
223 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
224 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
225 "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", \
226 "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", \
227 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
228 "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
229 "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", \
230 "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", \
231 "mq", "lr", "ctr", "ap", \
232 "cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7", \
234 "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", \
235 "v8", "v9", "v10", "v11", "v12", "v13", "v14", "v15", \
236 "v16", "v17", "v18", "v19", "v20", "v21", "v22", "v23", \
237 "v24", "v25", "v26", "v27", "v28", "v29", "v30", "v31", \
239 "spe_acc", "spefscr", \
243 /* This outputs NAME to FILE. */
245 #undef RS6000_OUTPUT_BASENAME
246 #define RS6000_OUTPUT_BASENAME(FILE, NAME) \
247 assemble_name (FILE, NAME)
249 /* Globalizing directive for a label. */
251 #define GLOBAL_ASM_OP "\t.globl "
252 #undef TARGET_ASM_GLOBALIZE_LABEL
254 /* This is how to output an internal label prefix. rs6000.c uses this
255 when generating traceback tables. */
256 /* Not really used for Darwin? */
258 #undef ASM_OUTPUT_INTERNAL_LABEL_PREFIX
259 #define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX) \
260 fprintf (FILE, "%s", PREFIX)
262 /* This says how to output an assembler line to define a global common
265 #undef ASM_OUTPUT_ALIGNED_COMMON
266 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \
268 unsigned HOST_WIDE_INT _new_size = SIZE; \
269 fputs (".comm ", (FILE)); \
270 RS6000_OUTPUT_BASENAME ((FILE), (NAME)); \
271 if (_new_size == 0) _new_size = 1; \
272 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", _new_size); \
275 /* Override the standard rs6000 definition. */
277 #undef ASM_COMMENT_START
278 #define ASM_COMMENT_START ";"
280 /* FP save and restore routines. */
281 #define SAVE_FP_PREFIX "._savef"
282 #define SAVE_FP_SUFFIX ""
283 #define RESTORE_FP_PREFIX "._restf"
284 #define RESTORE_FP_SUFFIX ""
286 /* This is how to output an assembler line that says to advance
287 the location counter to a multiple of 2**LOG bytes using the
288 "nop" instruction as padding. */
290 #define ASM_OUTPUT_ALIGN_WITH_NOP(FILE,LOG) \
295 ASM_OUTPUT_ALIGN (FILE,LOG); \
297 else /* nop == ori r0,r0,0 */ \
298 fprintf (FILE, "\t.align32 %d,0x60000000\n", (LOG)); \
301 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
302 /* This is supported in cctools 465 and later. The macro test
303 above prevents using it in earlier build environments. */
304 #define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \
307 if ((MAX_SKIP) == 0) \
308 fprintf ((FILE), "\t.p2align %d\n", (LOG)); \
310 fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
314 /* Generate insns to call the profiler. */
316 #define PROFILE_HOOK(LABEL) output_profile_hook (LABEL)
318 /* Function name to call to do profiling. */
320 #define RS6000_MCOUNT "*mcount"
322 /* Default processor: G4, and G5 for 64-bit. */
324 #undef PROCESSOR_DEFAULT
325 #define PROCESSOR_DEFAULT PROCESSOR_PPC7400
326 #undef PROCESSOR_DEFAULT64
327 #define PROCESSOR_DEFAULT64 PROCESSOR_POWER4
329 /* Default target flag settings. Despite the fact that STMW/LMW
330 serializes, it's still a big code size win to use them. Use FSEL by
333 #undef TARGET_DEFAULT
334 #define TARGET_DEFAULT (MASK_POWERPC | MASK_MULTIPLE | MASK_NEW_MNEMONICS \
337 /* Darwin only runs on PowerPC, so short-circuit POWER patterns. */
339 #define TARGET_POWER 0
340 #undef TARGET_IEEEQUAD
341 #define TARGET_IEEEQUAD 0
343 /* Since Darwin doesn't do TOCs, stub this out. */
345 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE) ((void)X, (void)MODE, 0)
347 /* Unlike most other PowerPC targets, chars are signed, for
348 consistency with other Darwin architectures. */
350 #undef DEFAULT_SIGNED_CHAR
351 #define DEFAULT_SIGNED_CHAR (1)
353 /* Given an rtx X being reloaded into a reg required to be
354 in class CLASS, return the class of reg to actually use.
355 In general this is just CLASS; but on some machines
356 in some cases it is preferable to use a more restrictive class.
358 On the RS/6000, we have to return NO_REGS when we want to reload a
359 floating-point CONST_DOUBLE to force it to be copied to memory.
361 Don't allow R0 when loading the address of, or otherwise furtling with,
364 #undef PREFERRED_RELOAD_CLASS
365 #define PREFERRED_RELOAD_CLASS(X,CLASS) \
367 && reg_classes_intersect_p ((CLASS), FLOAT_REGS)) \
369 : ((GET_CODE (X) == SYMBOL_REF || GET_CODE (X) == HIGH) \
370 && reg_class_subset_p (BASE_REGS, (CLASS))) \
372 : (GET_MODE_CLASS (GET_MODE (X)) == MODE_INT \
373 && (CLASS) == NON_SPECIAL_REGS) \
377 /* Fix for emit_group_load (): force large constants to be pushed via regs. */
378 #define ALWAYS_PUSH_CONSTS_USING_REGS_P 1
380 /* Compute field alignment. This is similar to the version of the
381 macro in the Apple version of GCC, except that version supports
382 'mac68k' alignment, and that version uses the computed alignment
383 always for the first field of a structure. The first-field
384 behaviour is dealt with by
385 darwin_rs6000_special_round_type_align. */
386 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
387 (TARGET_ALIGN_NATURAL ? (COMPUTED) \
388 : (COMPUTED) == 128 ? 128 \
389 : MIN ((COMPUTED), 32))
391 /* Darwin increases natural record alignment to doubleword if the first
392 field is an FP double while the FP fields remain word aligned. */
393 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED) \
394 ((TREE_CODE (STRUCT) == RECORD_TYPE \
395 || TREE_CODE (STRUCT) == UNION_TYPE \
396 || TREE_CODE (STRUCT) == QUAL_UNION_TYPE) \
397 && TARGET_ALIGN_NATURAL == 0 \
398 ? darwin_rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED) \
399 : (TREE_CODE (STRUCT) == VECTOR_TYPE \
400 && ALTIVEC_VECTOR_MODE (TYPE_MODE (STRUCT))) \
401 ? MAX (MAX ((COMPUTED), (SPECIFIED)), 128) \
402 : MAX ((COMPUTED), (SPECIFIED)))
404 /* Specify padding for the last element of a block move between
405 registers and memory. FIRST is nonzero if this is the only
407 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
408 (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
410 /* XXX: Darwin supports neither .quad, or .llong, but it also doesn't
411 support 64 bit PowerPC either, so this just keeps things happy. */
412 #define DOUBLE_INT_ASM_OP "\t.quad\t"
414 /* For binary compatibility with 2.95; Darwin C APIs use bool from
415 stdbool.h, which was an int-sized enum in 2.95. Users can explicitly
416 choose to have sizeof(bool)==1 with the -mone-byte-bool switch. */
417 #define BOOL_TYPE_SIZE (darwin_one_byte_bool ? CHAR_TYPE_SIZE : INT_TYPE_SIZE)
419 #undef REGISTER_TARGET_PRAGMAS
420 #define REGISTER_TARGET_PRAGMAS() \
423 DARWIN_REGISTER_TARGET_PRAGMAS(); \
424 targetm.resolve_overloaded_builtin = altivec_resolve_overloaded_builtin; \
432 #define MD_UNWIND_SUPPORT "config/rs6000/darwin-unwind.h"
434 #define HAS_MD_FALLBACK_FRAME_STATE_FOR 1
436 /* True, iff we're generating fast turn around debugging code. When
437 true, we arrange for function prologues to start with 5 nops so
438 that gdb may insert code to redirect them, and for data to be
439 accessed indirectly. The runtime uses this indirection to forward
440 references for data to the original instance of that data. */
442 #define TARGET_FIX_AND_CONTINUE (darwin_fix_and_continue)
444 /* This is the reserved direct dispatch address for Objective-C. */
445 #define OFFS_MSGSEND_FAST 0xFFFEFF00
447 /* This is the reserved ivar address Objective-C. */
448 #define OFFS_ASSIGNIVAR_FAST 0xFFFEFEC0
450 /* Old versions of Mac OS/Darwin don't have C99 functions available. */
451 #undef TARGET_C99_FUNCTIONS
452 #define TARGET_C99_FUNCTIONS \
454 || (darwin_macosx_version_min \
455 && strverscmp (darwin_macosx_version_min, "10.3") >= 0))
457 /* When generating kernel code or kexts, we don't use Altivec by
458 default, as kernel code doesn't save/restore those registers. */
459 #define OS_MISSING_ALTIVEC (flag_mkernel || flag_apple_kext)