1 /* Target definitions for PowerPC running Darwin (Mac OS X).
2 Copyright (C) 1997-2015 Free Software Foundation, Inc.
3 Contributed by Apple Computer Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published
9 by the Free Software Foundation; either version 3, or (at your
10 option) any later version.
12 GCC is distributed in the hope that it will be useful, but WITHOUT
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
15 License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
24 /* The "Darwin ABI" is mostly like AIX, but with some key differences. */
26 #define DEFAULT_ABI ABI_DARWIN
31 #define TARGET_64BIT 1
33 #define TARGET_64BIT 0
37 /* The object file format is Mach-O. */
39 #define TARGET_OBJECT_FORMAT OBJECT_MACHO
41 /* Size of the Obj-C jump buffer. */
42 #define OBJC_JBLEN ((TARGET_64BIT) ? (26*2 + 18*2 + 129 + 1) : (26 + 18*2 + 129 + 1))
44 /* We're not ever going to do TOCs. */
47 #define TARGET_NO_TOC 1
49 /* Override the default rs6000 definition. */
51 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
53 #define TARGET_OS_CPP_BUILTINS() \
56 if (!TARGET_64BIT) builtin_define ("__ppc__"); \
57 if (TARGET_64BIT) builtin_define ("__ppc64__"); \
58 builtin_define ("__POWERPC__"); \
59 builtin_define ("__NATURAL_ALIGNMENT__"); \
60 darwin_cpp_builtins (pfile); \
64 /* Generate branch islands stubs if this is true. */
65 extern int darwin_emit_branch_islands
;
67 #define SUBTARGET_OVERRIDE_OPTIONS darwin_rs6000_override_options ()
69 #define C_COMMON_OVERRIDE_OPTIONS do { \
70 /* On powerpc, __cxa_get_exception_ptr is available starting in the \
71 10.4.6 libstdc++.dylib. */ \
72 if (strverscmp (darwin_macosx_version_min, "10.4.6") < 0 \
73 && flag_use_cxa_get_exception_ptr == 2) \
74 flag_use_cxa_get_exception_ptr = 0; \
76 flag_no_builtin = 1; \
77 SUBTARGET_C_COMMON_OVERRIDE_OPTIONS; \
80 /* Darwin has 128-bit long double support in libc in 10.4 and later.
81 Default to 128-bit long doubles even on earlier platforms for ABI
82 consistency; arithmetic will work even if libc and libm support is
85 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
88 /* We want -fPIC by default, unless we're using -static to compile for
89 the kernel or some such. The "-faltivec" option should have been
90 called "-maltivec" all along. */
94 %{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }} \
95 %{static: %{Zdynamic: %e conflicting code gen style switches are used}}\
96 %{!mmacosx-version-min=*:-mmacosx-version-min=%(darwin_minversion)} \
97 %{!mkernel:%{!static:%{!mdynamic-no-pic:-fPIC}}} \
98 %{faltivec:-maltivec -include altivec.h} %{fno-altivec:-mno-altivec} \
99 %<faltivec %<fno-altivec " \
102 #define DARWIN_ARCH_SPEC "%{m64:ppc64;:ppc}"
104 #define DARWIN_SUBARCH_SPEC " \
119 mcpu=power4:ppc970; \
123 /* crt2.o is at least partially required for 10.3.x and earlier. */
124 #define DARWIN_CRT2_SPEC \
125 "%{!m64:%:version-compare(!> 10.4 mmacosx-version-min= crt2.o%s)}"
127 /* Determine a minimum version based on compiler options. */
128 #define DARWIN_MINVERSION_SPEC \
129 "%{m64:%{fgnu-runtime:10.4; \
130 ,objective-c|,objc-cpp-output:10.5; \
131 ,objective-c-header:10.5; \
132 ,objective-c++|,objective-c++-cpp-output:10.5; \
133 ,objective-c++-header|,objc++-cpp-output:10.5; \
135 shared-libgcc:10.3; \
138 #undef SUBTARGET_EXTRA_SPECS
139 #define SUBTARGET_EXTRA_SPECS \
141 { "darwin_arch", DARWIN_ARCH_SPEC }, \
142 { "darwin_crt2", DARWIN_CRT2_SPEC }, \
143 { "darwin_subarch", DARWIN_SUBARCH_SPEC },
145 /* Output a .machine directive. */
146 #undef TARGET_ASM_FILE_START
147 #define TARGET_ASM_FILE_START rs6000_darwin_file_start
149 /* Make both r2 and r13 available for allocation. */
153 /* Base register for access to local variables of the function. */
155 #undef HARD_FRAME_POINTER_REGNUM
156 #define HARD_FRAME_POINTER_REGNUM 30
158 #undef RS6000_PIC_OFFSET_TABLE_REGNUM
159 #define RS6000_PIC_OFFSET_TABLE_REGNUM 31
161 /* Pad the outgoing args area to 16 bytes instead of the usual 8. */
163 #undef STARTING_FRAME_OFFSET
164 #define STARTING_FRAME_OFFSET \
165 (FRAME_GROWS_DOWNWARD \
167 : (RS6000_ALIGN (crtl->outgoing_args_size, 16) \
170 #undef STACK_DYNAMIC_OFFSET
171 #define STACK_DYNAMIC_OFFSET(FUNDECL) \
172 (RS6000_ALIGN (crtl->outgoing_args_size, 16) \
173 + (STACK_POINTER_OFFSET))
175 /* Darwin uses a function call if everything needs to be saved/restored. */
178 #define WORLD_SAVE_P(INFO) ((INFO)->world_save_p)
180 /* We don't use these on Darwin, they are just place-holders. */
181 #define SAVE_FP_PREFIX ""
182 #define SAVE_FP_SUFFIX ""
183 #define RESTORE_FP_PREFIX ""
184 #define RESTORE_FP_SUFFIX ""
186 /* The assembler wants the alternate register names, but without
187 leading percent sign. */
188 #undef REGISTER_NAMES
189 #define REGISTER_NAMES \
191 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
192 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
193 "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", \
194 "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", \
195 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
196 "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
197 "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", \
198 "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", \
199 "mq", "lr", "ctr", "ap", \
200 "cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7", \
202 "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", \
203 "v8", "v9", "v10", "v11", "v12", "v13", "v14", "v15", \
204 "v16", "v17", "v18", "v19", "v20", "v21", "v22", "v23", \
205 "v24", "v25", "v26", "v27", "v28", "v29", "v30", "v31", \
207 "spe_acc", "spefscr", \
209 "tfhar", "tfiar", "texasr", \
210 "rh0", "rh1", "rh2", "rh3", "rh4", "rh5", "rh6", "rh7", \
211 "rh8", "rh9", "rh10", "rh11", "rh12", "rh13", "rh14", "rh15", \
212 "rh16", "rh17", "rh18", "rh19", "rh20", "rh21", "rh22", "rh23", \
213 "rh24", "rh25", "rh26", "rh27", "rh28", "rh29", "rh30", "rh31" \
216 /* This outputs NAME to FILE. */
218 #undef RS6000_OUTPUT_BASENAME
219 #define RS6000_OUTPUT_BASENAME(FILE, NAME) \
220 assemble_name (FILE, NAME)
222 /* Globalizing directive for a label. */
224 #define GLOBAL_ASM_OP "\t.globl "
225 #undef TARGET_ASM_GLOBALIZE_LABEL
227 /* This is how to output an internal label prefix. rs6000.c uses this
228 when generating traceback tables. */
229 /* Not really used for Darwin? */
231 #undef ASM_OUTPUT_INTERNAL_LABEL_PREFIX
232 #define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX) \
233 fprintf (FILE, "%s", PREFIX)
235 /* Override the standard rs6000 definition. */
237 #undef ASM_COMMENT_START
238 #define ASM_COMMENT_START ";"
240 /* This is how to output an assembler line that says to advance
241 the location counter to a multiple of 2**LOG bytes using the
242 "nop" instruction as padding. */
244 #define ASM_OUTPUT_ALIGN_WITH_NOP(FILE,LOG) \
249 ASM_OUTPUT_ALIGN (FILE,LOG); \
251 else /* nop == ori r0,r0,0 */ \
252 fprintf (FILE, "\t.align32 %d,0x60000000\n", (LOG)); \
255 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
256 /* This is supported in cctools 465 and later. The macro test
257 above prevents using it in earlier build environments. */
258 #define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \
261 if ((MAX_SKIP) == 0) \
262 fprintf ((FILE), "\t.p2align %d\n", (LOG)); \
264 fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
268 /* Generate insns to call the profiler. */
270 #define PROFILE_HOOK(LABEL) output_profile_hook (LABEL)
272 /* Function name to call to do profiling. */
274 #define RS6000_MCOUNT "*mcount"
276 /* Default processor: G4, and G5 for 64-bit. */
278 #undef PROCESSOR_DEFAULT
279 #define PROCESSOR_DEFAULT PROCESSOR_PPC7400
280 #undef PROCESSOR_DEFAULT64
281 #define PROCESSOR_DEFAULT64 PROCESSOR_POWER4
283 /* Default target flag settings. Despite the fact that STMW/LMW
284 serializes, it's still a big code size win to use them. Use FSEL by
287 #undef TARGET_DEFAULT
288 #define TARGET_DEFAULT (MASK_MULTIPLE | MASK_PPC_GFXOPT)
290 /* Darwin always uses IBM long double, never IEEE long double. */
291 #undef TARGET_IEEEQUAD
292 #define TARGET_IEEEQUAD 0
294 /* Since Darwin doesn't do TOCs, stub this out. */
296 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE) ((void)X, (void)MODE, 0)
298 /* Unlike most other PowerPC targets, chars are signed, for
299 consistency with other Darwin architectures. */
301 #undef DEFAULT_SIGNED_CHAR
302 #define DEFAULT_SIGNED_CHAR (1)
304 /* Given an rtx X being reloaded into a reg required to be
305 in class CLASS, return the class of reg to actually use.
306 In general this is just CLASS; but on some machines
307 in some cases it is preferable to use a more restrictive class.
309 On the RS/6000, we have to return NO_REGS when we want to reload a
310 floating-point CONST_DOUBLE to force it to be copied to memory.
312 Don't allow R0 when loading the address of, or otherwise furtling with,
315 #undef PREFERRED_RELOAD_CLASS
316 #define PREFERRED_RELOAD_CLASS(X,CLASS) \
318 && reg_classes_intersect_p ((CLASS), FLOAT_REGS)) \
320 : ((GET_CODE (X) == SYMBOL_REF || GET_CODE (X) == HIGH) \
321 && reg_class_subset_p (BASE_REGS, (CLASS))) \
323 : (GET_MODE_CLASS (GET_MODE (X)) == MODE_INT \
324 && (CLASS) == NON_SPECIAL_REGS) \
328 /* Compute field alignment.
329 This implements the 'power' alignment rule by pegging the alignment of
330 items (beyond the first aggregate field) to 32 bits. The pegging is
331 suppressed for vector and long double items (both 128 in size).
332 There is a dummy use of the FIELD argument to avoid an unused variable
333 warning (see PR59496). */
334 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
336 (TARGET_ALIGN_NATURAL \
338 : (COMPUTED) == 128 \
340 : MIN ((COMPUTED), 32)))
342 /* Darwin increases natural record alignment to doubleword if the first
343 field is an FP double while the FP fields remain word aligned. */
344 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED) \
345 ((TREE_CODE (STRUCT) == RECORD_TYPE \
346 || TREE_CODE (STRUCT) == UNION_TYPE \
347 || TREE_CODE (STRUCT) == QUAL_UNION_TYPE) \
348 && TARGET_ALIGN_NATURAL == 0 \
349 ? darwin_rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED) \
350 : (TREE_CODE (STRUCT) == VECTOR_TYPE \
351 && ALTIVEC_VECTOR_MODE (TYPE_MODE (STRUCT))) \
352 ? MAX (MAX ((COMPUTED), (SPECIFIED)), 128) \
353 : MAX ((COMPUTED), (SPECIFIED)))
355 /* Specify padding for the last element of a block move between
356 registers and memory. FIRST is nonzero if this is the only
358 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
359 (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
361 #define DOUBLE_INT_ASM_OP "\t.quad\t"
363 /* For binary compatibility with 2.95; Darwin C APIs use bool from
364 stdbool.h, which was an int-sized enum in 2.95. Users can explicitly
365 choose to have sizeof(bool)==1 with the -mone-byte-bool switch. */
366 #define BOOL_TYPE_SIZE (darwin_one_byte_bool ? CHAR_TYPE_SIZE : INT_TYPE_SIZE)
368 #undef REGISTER_TARGET_PRAGMAS
369 #define REGISTER_TARGET_PRAGMAS() \
372 DARWIN_REGISTER_TARGET_PRAGMAS(); \
373 targetm.resolve_overloaded_builtin = altivec_resolve_overloaded_builtin; \
381 /* True, iff we're generating fast turn around debugging code. When
382 true, we arrange for function prologues to start with 5 nops so
383 that gdb may insert code to redirect them, and for data to be
384 accessed indirectly. The runtime uses this indirection to forward
385 references for data to the original instance of that data. */
387 #define TARGET_FIX_AND_CONTINUE (darwin_fix_and_continue)
389 /* This is the reserved direct dispatch address for Objective-C. */
390 #define OFFS_MSGSEND_FAST 0xFFFEFF00
392 /* This is the reserved ivar address Objective-C. */
393 #define OFFS_ASSIGNIVAR_FAST 0xFFFEFEC0
395 /* Old versions of Mac OS/Darwin don't have C99 functions available. */
396 #undef TARGET_LIBC_HAS_FUNCTION
397 #define TARGET_LIBC_HAS_FUNCTION darwin_libc_has_function
399 /* When generating kernel code or kexts, we don't use Altivec by
400 default, as kernel code doesn't save/restore those registers. */
401 #define OS_MISSING_ALTIVEC (flag_mkernel || flag_apple_kext)
403 /* Darwin has support for section anchors on powerpc*.
404 It is disabled for any section containing a "zero-sized item" (because these
405 are re-written as size=1 to be compatible with the OSX ld64).
406 The re-writing would interfere with the computation of anchor offsets.
407 Therefore, we place zero-sized items in their own sections and make such
408 sections unavailable to section anchoring. */
410 #undef TARGET_ASM_OUTPUT_ANCHOR
411 #define TARGET_ASM_OUTPUT_ANCHOR darwin_asm_output_anchor
413 #undef TARGET_USE_ANCHORS_FOR_SYMBOL_P
414 #define TARGET_USE_ANCHORS_FOR_SYMBOL_P darwin_use_anchors_for_symbol_p
416 #undef DARWIN_SECTION_ANCHORS
417 #define DARWIN_SECTION_ANCHORS 1
419 /* PPC Darwin has to rename some of the long double builtins. */
420 #undef SUBTARGET_INIT_BUILTINS
421 #define SUBTARGET_INIT_BUILTINS \
423 darwin_patch_builtins (); \
424 rs6000_builtin_decls[(unsigned) (RS6000_BUILTIN_CFSTRING)] \
425 = darwin_init_cfstring_builtins ((unsigned) (RS6000_BUILTIN_CFSTRING)); \
428 /* So far, there is no rs6000_fold_builtin, if one is introduced, then
429 this will need to be modified similar to the x86 case. */
430 #define TARGET_FOLD_BUILTIN SUBTARGET_FOLD_BUILTIN
432 /* Use standard DWARF numbering for DWARF debugging information. */
433 #define RS6000_USE_DWARF_NUMBERING