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 /* We're not ever going to do TOCs. */
46 #define TARGET_NO_TOC 1
48 /* Override the default rs6000 definition. */
50 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
52 /* Translate config/rs6000/darwin.opt to config/darwin.h. */
53 #define TARGET_DYNAMIC_NO_PIC (TARGET_MACHO_DYNAMIC_NO_PIC)
55 /* Handle #pragma weak and #pragma pack. */
56 #define HANDLE_SYSV_PRAGMA 1
59 #define TARGET_OS_CPP_BUILTINS() \
62 if (!TARGET_64BIT) builtin_define ("__ppc__"); \
63 if (TARGET_64BIT) builtin_define ("__ppc64__"); \
64 builtin_define ("__POWERPC__"); \
65 builtin_define ("__NATURAL_ALIGNMENT__"); \
66 darwin_cpp_builtins (pfile); \
71 #define SUBTARGET_OVERRIDE_OPTIONS \
73 /* The Darwin ABI always includes AltiVec, can't be (validly) turned \
75 rs6000_altivec_abi = 1; \
76 TARGET_ALTIVEC_VRSAVE = 1; \
77 if (DEFAULT_ABI == ABI_DARWIN) \
79 if (MACHO_DYNAMIC_NO_PIC_P) \
82 warning (0, "-mdynamic-no-pic overrides -fpic or -fPIC"); \
85 else if (flag_pic == 1) \
87 /* Darwin doesn't support -fpic. */ \
91 if (TARGET_64BIT && ! TARGET_POWERPC64) \
93 target_flags |= MASK_POWERPC64; \
94 warning (0, "-m64 requires PowerPC64 architecture, enabling"); \
98 #define C_COMMON_OVERRIDE_OPTIONS do { \
99 /* On powerpc, __cxa_get_exception_ptr is available starting in the \
100 10.5 libstdc++.dylib. */ \
101 if ((! darwin_macosx_version_min \
102 || strverscmp (darwin_macosx_version_min, "10.5") < 0) \
103 && flag_use_cxa_get_exception_ptr == 2) \
104 flag_use_cxa_get_exception_ptr = 0; \
105 /* On powerpc, __cxa_atexit is available starting in the 10.4 \
106 libSystem.dylib. */ \
107 if ((! darwin_macosx_version_min \
108 || strverscmp (darwin_macosx_version_min, "10.4") < 0) \
109 && flag_use_cxa_atexit == 2) \
110 flag_use_cxa_atexit = 0; \
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 %{!static:%{!mdynamic-no-pic:-fPIC}}"
129 #define DARWIN_SUBARCH_SPEC " \
144 mcpu=power4:ppc970; \
148 /* crt2.o is at least partially required for 10.3.x and earlier. */
149 #define DARWIN_CRT2_SPEC \
150 "%{!m64:%:version-compare(!> 10.4 mmacosx-version-min= crt2.o%s)}"
152 #undef SUBTARGET_EXTRA_SPECS
153 #define SUBTARGET_EXTRA_SPECS \
154 { "darwin_arch", "%{m64:ppc64;:ppc}" }, \
155 { "darwin_crt2", DARWIN_CRT2_SPEC }, \
156 { "darwin_subarch", DARWIN_SUBARCH_SPEC },
158 /* Output a .machine directive. */
159 #undef TARGET_ASM_FILE_START
160 #define TARGET_ASM_FILE_START rs6000_darwin_file_start
162 /* The "-faltivec" option should have been called "-maltivec" all
163 along. -ffix-and-continue and -findirect-data is for compatibility
164 for old compilers. */
166 #define SUBTARGET_OPTION_TRANSLATE_TABLE \
167 { "-ffix-and-continue", "-mfix-and-continue" }, \
168 { "-findirect-data", "-mfix-and-continue" }, \
169 { "-faltivec", "-maltivec -include altivec.h" }, \
170 { "-fno-altivec", "-mno-altivec" }, \
171 { "-Waltivec-long-deprecated", "-mwarn-altivec-long" }, \
172 { "-Wno-altivec-long-deprecated", "-mno-warn-altivec-long" }
174 /* Make both r2 and r13 available for allocation. */
178 /* Base register for access to local variables of the function. */
180 #undef HARD_FRAME_POINTER_REGNUM
181 #define HARD_FRAME_POINTER_REGNUM 30
183 #undef RS6000_PIC_OFFSET_TABLE_REGNUM
184 #define RS6000_PIC_OFFSET_TABLE_REGNUM 31
186 /* Pad the outgoing args area to 16 bytes instead of the usual 8. */
188 #undef STARTING_FRAME_OFFSET
189 #define STARTING_FRAME_OFFSET \
190 (FRAME_GROWS_DOWNWARD \
192 : (RS6000_ALIGN (current_function_outgoing_args_size, 16) \
195 #undef STACK_DYNAMIC_OFFSET
196 #define STACK_DYNAMIC_OFFSET(FUNDECL) \
197 (RS6000_ALIGN (current_function_outgoing_args_size, 16) \
198 + (STACK_POINTER_OFFSET))
200 /* These are used by -fbranch-probabilities */
201 #define HOT_TEXT_SECTION_NAME "__TEXT,__text,regular,pure_instructions"
202 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME \
203 "__TEXT,__unlikely,regular,pure_instructions"
205 /* Define cutoff for using external functions to save floating point.
206 Currently on Darwin, always use inline stores. */
208 #undef FP_SAVE_INLINE
209 #define FP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) < 64)
211 /* Darwin uses a function call if everything needs to be saved/restored. */
213 #define WORLD_SAVE_P(INFO) ((INFO)->world_save_p)
215 /* The assembler wants the alternate register names, but without
216 leading percent sign. */
217 #undef REGISTER_NAMES
218 #define REGISTER_NAMES \
220 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
221 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
222 "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", \
223 "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", \
224 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
225 "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
226 "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", \
227 "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", \
228 "mq", "lr", "ctr", "ap", \
229 "cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7", \
231 "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", \
232 "v8", "v9", "v10", "v11", "v12", "v13", "v14", "v15", \
233 "v16", "v17", "v18", "v19", "v20", "v21", "v22", "v23", \
234 "v24", "v25", "v26", "v27", "v28", "v29", "v30", "v31", \
236 "spe_acc", "spefscr", \
240 /* This outputs NAME to FILE. */
242 #undef RS6000_OUTPUT_BASENAME
243 #define RS6000_OUTPUT_BASENAME(FILE, NAME) \
244 assemble_name (FILE, NAME)
246 /* Globalizing directive for a label. */
248 #define GLOBAL_ASM_OP "\t.globl "
249 #undef TARGET_ASM_GLOBALIZE_LABEL
251 /* This is how to output an internal label prefix. rs6000.c uses this
252 when generating traceback tables. */
253 /* Not really used for Darwin? */
255 #undef ASM_OUTPUT_INTERNAL_LABEL_PREFIX
256 #define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX) \
257 fprintf (FILE, "%s", PREFIX)
259 /* This says how to output an assembler line to define a global common
262 #undef ASM_OUTPUT_ALIGNED_COMMON
263 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \
265 unsigned HOST_WIDE_INT _new_size = SIZE; \
266 fputs (".comm ", (FILE)); \
267 RS6000_OUTPUT_BASENAME ((FILE), (NAME)); \
268 if (_new_size == 0) _new_size = 1; \
269 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", _new_size); \
272 /* Override the standard rs6000 definition. */
274 #undef ASM_COMMENT_START
275 #define ASM_COMMENT_START ";"
277 /* FP save and restore routines. */
278 #define SAVE_FP_PREFIX "._savef"
279 #define SAVE_FP_SUFFIX ""
280 #define RESTORE_FP_PREFIX "._restf"
281 #define RESTORE_FP_SUFFIX ""
283 /* This is how to output an assembler line that says to advance
284 the location counter to a multiple of 2**LOG bytes using the
285 "nop" instruction as padding. */
287 #define ASM_OUTPUT_ALIGN_WITH_NOP(FILE,LOG) \
292 ASM_OUTPUT_ALIGN (FILE,LOG); \
294 else /* nop == ori r0,r0,0 */ \
295 fprintf (FILE, "\t.align32 %d,0x60000000\n", (LOG)); \
298 /* Generate insns to call the profiler. */
300 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
301 /* This is supported in cctools 465 and later. The macro test
302 above prevents using it in earlier build environments. */
303 #define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \
306 if ((MAX_SKIP) == 0) \
307 fprintf ((FILE), "\t.p2align %d\n", (LOG)); \
309 fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
313 #define PROFILE_HOOK(LABEL) output_profile_hook (LABEL)
315 /* Function name to call to do profiling. */
317 #define RS6000_MCOUNT "*mcount"
319 /* Default processor: G4, and G5 for 64-bit. */
321 #undef PROCESSOR_DEFAULT
322 #define PROCESSOR_DEFAULT PROCESSOR_PPC7400
323 #undef PROCESSOR_DEFAULT64
324 #define PROCESSOR_DEFAULT64 PROCESSOR_POWER4
326 /* Default target flag settings. Despite the fact that STMW/LMW
327 serializes, it's still a big code size win to use them. Use FSEL by
330 #undef TARGET_DEFAULT
331 #define TARGET_DEFAULT (MASK_POWERPC | MASK_MULTIPLE | MASK_NEW_MNEMONICS \
334 /* Darwin only runs on PowerPC, so short-circuit POWER patterns. */
336 #define TARGET_POWER 0
337 #undef TARGET_IEEEQUAD
338 #define TARGET_IEEEQUAD 0
340 /* Since Darwin doesn't do TOCs, stub this out. */
342 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE) ((void)X, (void)MODE, 0)
344 /* Unlike most other PowerPC targets, chars are signed, for
345 consistency with other Darwin architectures. */
347 #undef DEFAULT_SIGNED_CHAR
348 #define DEFAULT_SIGNED_CHAR (1)
350 /* Given an rtx X being reloaded into a reg required to be
351 in class CLASS, return the class of reg to actually use.
352 In general this is just CLASS; but on some machines
353 in some cases it is preferable to use a more restrictive class.
355 On the RS/6000, we have to return NO_REGS when we want to reload a
356 floating-point CONST_DOUBLE to force it to be copied to memory.
358 Don't allow R0 when loading the address of, or otherwise furtling with,
361 #undef PREFERRED_RELOAD_CLASS
362 #define PREFERRED_RELOAD_CLASS(X,CLASS) \
364 && reg_classes_intersect_p ((CLASS), FLOAT_REGS)) \
366 : ((GET_CODE (X) == SYMBOL_REF || GET_CODE (X) == HIGH) \
367 && reg_class_subset_p (BASE_REGS, (CLASS))) \
369 : (GET_MODE_CLASS (GET_MODE (X)) == MODE_INT \
370 && (CLASS) == NON_SPECIAL_REGS) \
374 /* Fix for emit_group_load (): force large constants to be pushed via regs. */
375 #define ALWAYS_PUSH_CONSTS_USING_REGS_P 1
377 /* This now supports a natural alignment mode */
378 /* Darwin word-aligns FP doubles but doubleword-aligns 64-bit ints. */
379 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
380 (TARGET_ALIGN_NATURAL ? (COMPUTED) : \
381 (TYPE_MODE (TREE_CODE (TREE_TYPE (FIELD)) == ARRAY_TYPE \
382 ? get_inner_array_type (FIELD) \
383 : TREE_TYPE (FIELD)) == DFmode \
384 ? MIN ((COMPUTED), 32) : (COMPUTED)))
386 /* Darwin increases natural record alignment to doubleword if the first
387 field is an FP double while the FP fields remain word aligned. */
388 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED) \
389 ((TREE_CODE (STRUCT) == RECORD_TYPE \
390 || TREE_CODE (STRUCT) == UNION_TYPE \
391 || TREE_CODE (STRUCT) == QUAL_UNION_TYPE) \
392 && TARGET_ALIGN_NATURAL == 0 \
393 ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED) \
394 : (TREE_CODE (STRUCT) == VECTOR_TYPE \
395 && ALTIVEC_VECTOR_MODE (TYPE_MODE (STRUCT))) \
396 ? MAX (MAX ((COMPUTED), (SPECIFIED)), 128) \
397 : MAX ((COMPUTED), (SPECIFIED)))
399 /* Specify padding for the last element of a block move between
400 registers and memory. FIRST is nonzero if this is the only
402 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
403 (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
405 /* XXX: Darwin supports neither .quad, or .llong, but it also doesn't
406 support 64 bit PowerPC either, so this just keeps things happy. */
407 #define DOUBLE_INT_ASM_OP "\t.quad\t"
409 /* For binary compatibility with 2.95; Darwin C APIs use bool from
410 stdbool.h, which was an int-sized enum in 2.95. Users can explicitly
411 choose to have sizeof(bool)==1 with the -mone-byte-bool switch. */
412 #define BOOL_TYPE_SIZE (darwin_one_byte_bool ? CHAR_TYPE_SIZE : INT_TYPE_SIZE)
414 #undef REGISTER_TARGET_PRAGMAS
415 #define REGISTER_TARGET_PRAGMAS() \
418 DARWIN_REGISTER_TARGET_PRAGMAS(); \
419 targetm.resolve_overloaded_builtin = altivec_resolve_overloaded_builtin; \
427 #define MD_UNWIND_SUPPORT "config/rs6000/darwin-unwind.h"
429 #define HAS_MD_FALLBACK_FRAME_STATE_FOR 1
431 /* True, iff we're generating fast turn around debugging code. When
432 true, we arrange for function prologues to start with 5 nops so
433 that gdb may insert code to redirect them, and for data to be
434 accessed indirectly. The runtime uses this indirection to forward
435 references for data to the original instance of that data. */
437 #define TARGET_FIX_AND_CONTINUE (darwin_fix_and_continue)
439 /* This is the reserved direct dispatch address for Objective-C. */
440 #define OFFS_MSGSEND_FAST 0xFFFEFF00
442 /* This is the reserved ivar address Objective-C. */
443 #define OFFS_ASSIGNIVAR_FAST 0xFFFEFEC0
445 /* Old versions of Mac OS/Darwin don't have C99 functions available. */
446 #undef TARGET_C99_FUNCTIONS
447 #define TARGET_C99_FUNCTIONS \
449 || (darwin_macosx_version_min \
450 && strverscmp (darwin_macosx_version_min, "10.3") >= 0))
452 /* Attempt to turn on execute permission for the stack. This may be
453 used by INITIALIZE_TRAMPOLINE of the target needs it (that is,
454 if the target machine can change execute permissions on a page).
456 There is no way to query the execute permission of the stack, so
457 we always issue the mprotect() call.
459 Note that we go out of our way to use namespace-non-invasive calls
460 here. Unfortunately, there is no libc-internal name for mprotect().
462 Also note that no errors should be emitted by this code; it is
463 considered dangerous for library calls to send messages to
466 #define ENABLE_EXECUTE_STACK \
467 extern void __enable_execute_stack (void *); \
469 __enable_execute_stack (void *addr) \
471 extern int mprotect (void *, size_t, int); \
472 extern int __sysctl (int *, unsigned int, void *, size_t *, \
485 mib[0] = 6; /* CTL_HW */ \
486 mib[1] = 7; /* HW_PAGESIZE */ \
487 len = sizeof (size); \
488 (void) __sysctl (mib, 2, &size, &len, NULL, 0); \
489 mask = ~((long) size - 1); \
492 page = (char *) (((long) addr) & mask); \
493 end = (char *) ((((long) (addr + (TARGET_64BIT ? 48 : 40))) & mask) + size); \
495 /* 7 == PROT_READ | PROT_WRITE | PROT_EXEC */ \
496 (void) mprotect (page, end - page, 7); \