1 /* Target definitions for PowerPC running Darwin (Mac OS X).
2 Copyright (C) 1997-2023 Free Software Foundation, Inc.
3 Contributed by Apple Computer Inc.
4
5 This file is part of GCC.
6
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.
11
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.
16
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/>. */
20
21 #undef DARWIN_PPC
22 #define DARWIN_PPC 1
23
24 /* The "Darwin ABI" is mostly like AIX, but with some key differences. */
25
26 #define DEFAULT_ABI ABI_DARWIN
27
28 #ifdef IN_LIBGCC2
29 #undef TARGET_64BIT
30 #ifdef __powerpc64__
31 #define TARGET_64BIT 1
32 #else
33 #define TARGET_64BIT 0
34 #endif
35 #endif
36
37 /* The object file format is Mach-O. */
38
39 #define TARGET_OBJECT_FORMAT OBJECT_MACHO
40
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))
43
44 /* We're not ever going to do TOCs. */
45
46 #define TARGET_HAS_TOC 0
47
48 /* Override the default rs6000 definition. */
49 #undef PTRDIFF_TYPE
50 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
51
52 #define TARGET_OS_CPP_BUILTINS() \
53 do \
54 { \
55 builtin_define ("__POWERPC__"); \
56 builtin_define ("__PPC__"); \
57 if (TARGET_64BIT) \
58 { \
59 builtin_define ("__ppc64__"); \
60 builtin_define ("__PPC64__"); \
61 builtin_define ("__powerpc64__"); \
62 builtin_assert ("cpu=powerpc64"); \
63 builtin_assert ("machine=powerpc64"); \
64 } \
65 else \
66 { \
67 builtin_define ("__ppc__"); \
68 builtin_define_std ("PPC"); \
69 builtin_assert ("cpu=powerpc"); \
70 builtin_assert ("machine=powerpc"); \
71 } \
72 builtin_define ("__NATURAL_ALIGNMENT__"); \
73 darwin_cpp_builtins (pfile); \
74 } \
75 while (0)
76
77 #define SUBTARGET_OVERRIDE_OPTIONS darwin_rs6000_override_options ()
78
79 #define C_COMMON_OVERRIDE_OPTIONS do { \
80 /* On powerpc, __cxa_get_exception_ptr is available starting in the \
81 10.4.6 libstdc++.dylib. */ \
82 if (strverscmp (darwin_macosx_version_min, "10.4.6") < 0 \
83 && flag_use_cxa_get_exception_ptr == 2) \
84 flag_use_cxa_get_exception_ptr = 0; \
85 if (flag_mkernel) \
86 flag_no_builtin = 1; \
87 SUBTARGET_C_COMMON_OVERRIDE_OPTIONS; \
88 } while (0)
89
90 /* Darwin has 128-bit long double support in libc in 10.4 and later.
91 Default to 128-bit long doubles even on earlier platforms for ABI
92 consistency; arithmetic will work even if libc and libm support is
93 not available. */
94
95 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
96
97 /* Machine dependent libraries.
98 Include libmx when targeting Darwin 7.0 and above, but before libSystem,
99 since the functions are actually in libSystem but for 7.x compatibility
100 we want them to be looked for in libmx first.
101 Include libSystemStubs when compiling against 10.3 - 10.5 SDKs (we assume
102 this is the case when targetting these) - but not for 64-bit long double.
103 Don't do either for m64, the library is either a dummy or non-existent.
104 */
105
106 #undef LIB_SPEC
107 #define LIB_SPEC \
108 "%{!static: \
109 %{!m64:%{!mlong-double-64: \
110 %{pg:%:version-compare(>< 10.3 10.5 mmacosx-version-min= -lSystemStubs_profile)} \
111 %{!pg:%:version-compare(>< 10.3 10.5 mmacosx-version-min= -lSystemStubs)} \
112 %:version-compare(>< 10.3 10.4 mmacosx-version-min= -lmx)}} \
113 -lSystem \
114 }"
115
116 /* We want -fPIC by default, unless we're using -static to compile for
117 the kernel or some such. The "-faltivec" option should have been
118 called "-maltivec" all along. */
119
120 #define CC1_SPEC "\
121 %(cc1_cpu) \
122 %{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }} \
123 %{static: %{Zdynamic: %e conflicting code gen style switches are used}}\
124 %{!mkernel:%{!static:%{!mdynamic-no-pic:-fPIC}}} \
125 %{faltivec:-maltivec -include altivec.h} %{fno-altivec:-mno-altivec} \
126 %<faltivec %<fno-altivec " \
127 DARWIN_CC1_SPEC
128
129 /* Default to PPC for single arch builds. */
130 #define DARWIN_ARCH_SPEC "ppc"
131
132 #define DARWIN_SUBARCH_SPEC " \
133 %{mcpu=601:ppc601; \
134 mcpu=603:ppc603; \
135 mcpu=603e:ppc603; \
136 mcpu=604:ppc604; \
137 mcpu=604e:ppc604e; \
138 mcpu=740:ppc750; \
139 mcpu=750:ppc750; \
140 mcpu=G3:ppc750; \
141 mcpu=7400:ppc7400; \
142 mcpu=G4:ppc7400; \
143 mcpu=7450:ppc7450; \
144 mcpu=970:ppc970; \
145 mcpu=power4:ppc970; \
146 mcpu=G5:ppc970; \
147 :ppc}"
148
149 /* We need to jam the crt to 10.5 for 10.6 (Rosetta) use. */
150 #undef DARWIN_CRT1_SPEC
151 #define DARWIN_CRT1_SPEC \
152 "%:version-compare(!> 10.5 mmacosx-version-min= -lcrt1.o) \
153 %:version-compare(>< 10.5 10.7 mmacosx-version-min= -lcrt1.10.5.o) \
154 %{fgnu-tm: -lcrttms.o}"
155
156 /* crt2.o is at least partially required for 10.3.x and earlier.
157 It deals with registration of the unwind frames, where this is not
158 automatically provided by the system. So we need it for any case that
159 might use exceptions. */
160 #undef DARWIN_CRT2_SPEC
161 #define DARWIN_CRT2_SPEC \
162 "%{!m64:%{shared-libgcc|static-libstdc++|fexceptions|fobjc-exceptions|fgnu-runtime: \
163 %:version-compare(!> 10.4 mmacosx-version-min= crt2.o%s) \
164 }}"
165
166 /* crt3 deals with providing cxa_atexit on earlier systems (or fixing it up,
167 for broken versions). It's only needed for c++ code, so we can make it
168 conditional on shared-libgcc since that's forced on for c++. */
169 #undef DARWIN_CRT3_SPEC
170 #define DARWIN_CRT3_SPEC \
171 "%{!m64:%{shared-libgcc|static-libstdc++: \
172 %:version-compare(>< 10.4 10.5 mmacosx-version-min= crt3.o%s) \
173 %:version-compare(!> 10.4 mmacosx-version-min= crt3_2.o%s) \
174 }}"
175
176 /* As for crt1, we need to force the dylib crt for 10.6. */
177 #undef DARWIN_DYLIB1_SPEC
178 #define DARWIN_DYLIB1_SPEC \
179 "%:version-compare(!> 10.5 mmacosx-version-min= -ldylib1.o) \
180 %:version-compare(>< 10.5 10.7 mmacosx-version-min= -ldylib1.10.5.o)"
181
182 /* Likewise, the bundle crt. */
183 #undef DARWIN_BUNDLE1_SPEC
184 #define DARWIN_BUNDLE1_SPEC \
185 "%{!static:%:version-compare(< 10.7 mmacosx-version-min= -lbundle1.o) \
186 %{fgnu-tm: -lcrttms.o}}"
187
188 /* The PPC regs save/restore functions are leaves and could, conceivably
189 be used by the tm destructor. */
190 #undef ENDFILE_SPEC
191 #define ENDFILE_SPEC TM_DESTRUCTOR " -lef_ppc"
192
193 #undef SUBTARGET_EXTRA_SPECS
194 #define SUBTARGET_EXTRA_SPECS \
195 DARWIN_EXTRA_SPECS \
196 { "darwin_arch", DARWIN_ARCH_SPEC }, \
197 { "darwin_crt2", DARWIN_CRT2_SPEC }, \
198 { "darwin_subarch", DARWIN_SUBARCH_SPEC },
199
200 /* Output a .machine directive. */
201 #undef TARGET_ASM_FILE_START
202 #define TARGET_ASM_FILE_START rs6000_darwin_file_start
203
204 /* Make both r2 and r13 available for allocation. */
205 #define FIXED_R2 0
206 #define FIXED_R13 TARGET_64BIT
207
208 /* Base register for access to local variables of the function. */
209
210 #undef HARD_FRAME_POINTER_REGNUM
211 #define HARD_FRAME_POINTER_REGNUM 30
212
213 #undef RS6000_PIC_OFFSET_TABLE_REGNUM
214 #define RS6000_PIC_OFFSET_TABLE_REGNUM 31
215
216 #undef FIRST_SAVED_GP_REGNO
217 #define FIRST_SAVED_GP_REGNO 13
218
219 /* Darwin's stack must remain 16-byte aligned for both 32 and 64 bit
220 ABIs. */
221
222 #undef STACK_BOUNDARY
223 #define STACK_BOUNDARY 128
224
225 /* Offset within stack frame to start allocating local variables at.
226 For supported Darwin versions, FRAME_GROWS_DOWNWARD is true, therefore
227 this value is the offset to the END of the first local allocated.
228
229 On the RS/6000, the frame pointer is the same as the stack pointer,
230 except for dynamic allocations. So we start after the fixed area and
231 outgoing parameter area.
232
233 If the function uses dynamic stack space (CALLS_ALLOCA is set), that
234 space needs to be aligned to STACK_BOUNDARY, i.e. the sum of the
235 sizes of the fixed area and the parameter area must be a multiple of
236 STACK_BOUNDARY. */
237
238 #undef RS6000_STARTING_FRAME_OFFSET
239 #define RS6000_STARTING_FRAME_OFFSET \
240 (cfun->calls_alloca \
241 ? RS6000_ALIGN (crtl->outgoing_args_size + RS6000_SAVE_AREA, 16) \
242 : (RS6000_ALIGN (crtl->outgoing_args_size, 16) + RS6000_SAVE_AREA))
243
244 /* Offset from the stack pointer register to an item dynamically
245 allocated on the stack, e.g., by `alloca'.
246
247 The default value for this macro is `STACK_POINTER_OFFSET' plus the
248 length of the outgoing arguments. The default is correct for most
249 machines. See `function.cc' for details.
250
251 This value must be a multiple of STACK_BOUNDARY (hard coded in
252 `emit-rtl.cc'). */
253
254 #undef STACK_DYNAMIC_OFFSET
255 #define STACK_DYNAMIC_OFFSET(FUNDECL) \
256 RS6000_ALIGN (crtl->outgoing_args_size.to_constant() \
257 + STACK_POINTER_OFFSET, 16)
258
259 /* Darwin uses a function call if everything needs to be saved/restored. */
260
261 #undef WORLD_SAVE_P
262 #define WORLD_SAVE_P(INFO) ((INFO)->world_save_p)
263
264 /* We don't use these on Darwin, they are just place-holders. */
265 #define SAVE_FP_PREFIX ""
266 #define SAVE_FP_SUFFIX ""
267 #define RESTORE_FP_PREFIX ""
268 #define RESTORE_FP_SUFFIX ""
269
270 /* The assembler wants the alternate register names, but without
271 leading percent sign. */
272 #undef REGISTER_NAMES
273 #define REGISTER_NAMES \
274 { \
275 /* GPRs */ \
276 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
277 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
278 "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", \
279 "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", \
280 /* FPRs */ \
281 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
282 "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
283 "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", \
284 "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", \
285 /* VRs */ \
286 "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", \
287 "v8", "v9", "v10", "v11", "v12", "v13", "v14", "v15", \
288 "v16", "v17", "v18", "v19", "v20", "v21", "v22", "v23", \
289 "v24", "v25", "v26", "v27", "v28", "v29", "v30", "v31", \
290 /* lr ctr ca ap */ \
291 "lr", "ctr", "xer", "ap", \
292 /* cr0..cr7 */ \
293 "cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7", \
294 /* vrsave vscr sfp */ \
295 "vrsave", "vscr", "sfp" \
296 }
297
298 /* This outputs NAME to FILE. */
299
300 #undef RS6000_OUTPUT_BASENAME
301 #define RS6000_OUTPUT_BASENAME(FILE, NAME) \
302 assemble_name (FILE, NAME)
303
304 /* Globalizing directive for a label. */
305 #undef GLOBAL_ASM_OP
306 #define GLOBAL_ASM_OP "\t.globl "
307 #undef TARGET_ASM_GLOBALIZE_LABEL
308
309 /* This is how to output an internal label prefix. rs6000.cc uses this
310 when generating traceback tables. */
311 /* Not really used for Darwin? */
312
313 #undef ASM_OUTPUT_INTERNAL_LABEL_PREFIX
314 #define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX) \
315 fprintf (FILE, "%s", PREFIX)
316
317 /* Override the standard rs6000 definition. */
318
319 #undef ASM_COMMENT_START
320 #define ASM_COMMENT_START ";"
321
322 /* This is how to output an assembler line that says to advance
323 the location counter to a multiple of 2**LOG bytes using the
324 "nop" instruction as padding. */
325
326 #define ASM_OUTPUT_ALIGN_WITH_NOP(FILE,LOG) \
327 do \
328 { \
329 if ((LOG) < 3) \
330 { \
331 ASM_OUTPUT_ALIGN (FILE,LOG); \
332 } \
333 else /* nop == ori r0,r0,0 */ \
334 fprintf (FILE, "\t.align32 %d,0x60000000\n", (LOG)); \
335 } while (0)
336
337 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
338 /* This is supported in cctools 465 and later. The macro test
339 above prevents using it in earlier build environments. */
340 #define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \
341 if ((LOG) > 0) \
342 { \
343 if ((MAX_SKIP) <= 0) \
344 fprintf ((FILE), "\t.p2align %d\n", (LOG)); \
345 else \
346 fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
347 }
348 #endif
349
350 /* Generate insns to call the profiler. */
351
352 #define PROFILE_HOOK(LABEL) output_profile_hook (LABEL)
353
354 /* Function name to call to do profiling. */
355
356 #define RS6000_MCOUNT "*mcount"
357
358 /* Default processor: G4, and G5 for 64-bit. */
359
360 #undef PROCESSOR_DEFAULT
361 #define PROCESSOR_DEFAULT PROCESSOR_PPC7400
362 #undef PROCESSOR_DEFAULT64
363 #define PROCESSOR_DEFAULT64 PROCESSOR_POWER4
364
365 /* Default target flag settings. Despite the fact that STMW/LMW
366 serializes, it's still a big code size win to use them. Use FSEL by
367 default as well. */
368
369 #undef TARGET_DEFAULT
370 #define TARGET_DEFAULT (OPTION_MASK_MULTIPLE | OPTION_MASK_PPC_GFXOPT)
371
372 /* Darwin always uses IBM long double, never IEEE long double. */
373 #undef TARGET_IEEEQUAD
374 #define TARGET_IEEEQUAD 0
375
376 #undef TARGET_IEEEQUAD_DEFAULT
377 #define TARGET_IEEEQUAD_DEFAULT 0
378
379 /* Since Darwin doesn't do TOCs, stub this out. */
380
381 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE) ((void)X, (void)MODE, 0)
382
383 /* Unlike most other PowerPC targets, chars are signed, for
384 consistency with other Darwin architectures. */
385
386 #undef DEFAULT_SIGNED_CHAR
387 #define DEFAULT_SIGNED_CHAR (1)
388
389 /* Given an rtx X being reloaded into a reg required to be
390 in class CLASS, return the class of reg to actually use.
391 In general this is just CLASS; but on some machines
392 in some cases it is preferable to use a more restrictive class.
393
394 On the RS/6000, we have to return NO_REGS when we want to reload a
395 floating-point CONST_DOUBLE to force it to be copied to memory.
396
397 Don't allow R0 when loading the address of, or otherwise furtling with,
398 a SYMBOL_REF. */
399
400 #undef PREFERRED_RELOAD_CLASS
401 #define PREFERRED_RELOAD_CLASS(X,CLASS) \
402 ((CONSTANT_P (X) \
403 && reg_classes_intersect_p ((CLASS), FLOAT_REGS)) \
404 ? NO_REGS \
405 : ((SYMBOL_REF_P (X) || GET_CODE (X) == HIGH) \
406 && reg_class_subset_p (BASE_REGS, (CLASS))) \
407 ? BASE_REGS \
408 : (GET_MODE_CLASS (GET_MODE (X)) == MODE_INT \
409 && (CLASS) == GEN_OR_FLOAT_REGS) \
410 ? GENERAL_REGS \
411 : (CLASS))
412
413 /* Compute field alignment.
414 This implements the 'power' alignment rule by pegging the alignment of
415 items (beyond the first aggregate field) to 32 bits. The pegging is
416 suppressed for vector and long double items (both 128 in size).
417 There is a dummy use of the FIELD argument to avoid an unused variable
418 warning (see PR59496). */
419 #define ADJUST_FIELD_ALIGN(FIELD, TYPE, COMPUTED) \
420 ((void) (FIELD), \
421 (TARGET_ALIGN_NATURAL \
422 ? (COMPUTED) \
423 : (COMPUTED) == 128 \
424 ? 128 \
425 : MIN ((COMPUTED), 32)))
426
427 /* Darwin increases natural record alignment to doubleword if the first
428 field is an FP double while the FP fields remain word aligned. */
429 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED) \
430 ((TREE_CODE (STRUCT) == RECORD_TYPE \
431 || TREE_CODE (STRUCT) == UNION_TYPE \
432 || TREE_CODE (STRUCT) == QUAL_UNION_TYPE) \
433 && TARGET_ALIGN_NATURAL == 0 \
434 ? darwin_rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED) \
435 : (TREE_CODE (STRUCT) == VECTOR_TYPE \
436 && ALTIVEC_VECTOR_MODE (TYPE_MODE (STRUCT))) \
437 ? MAX (MAX ((COMPUTED), (SPECIFIED)), 128) \
438 : MAX ((COMPUTED), (SPECIFIED)))
439
440 /* Specify padding for the last element of a block move between
441 registers and memory. FIRST is nonzero if this is the only
442 element. */
443 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
444 (!(FIRST) ? PAD_UPWARD : targetm.calls.function_arg_padding (MODE, TYPE))
445
446 #define DOUBLE_INT_ASM_OP "\t.quad\t"
447
448 /* For binary compatibility with 2.95; Darwin C APIs use bool from
449 stdbool.h, which was an int-sized enum in 2.95. Users can explicitly
450 choose to have sizeof(bool)==1 with the -mone-byte-bool switch. */
451 #define BOOL_TYPE_SIZE (darwin_one_byte_bool ? CHAR_TYPE_SIZE : INT_TYPE_SIZE)
452
453 #undef REGISTER_TARGET_PRAGMAS
454 #define REGISTER_TARGET_PRAGMAS() \
455 do \
456 { \
457 DARWIN_REGISTER_TARGET_PRAGMAS(); \
458 targetm.target_option.pragma_parse = rs6000_pragma_target_parse; \
459 targetm.resolve_overloaded_builtin = altivec_resolve_overloaded_builtin; \
460 } \
461 while (0)
462
463 #ifdef IN_LIBGCC2
464 #include <stdbool.h>
465 #endif
466
467 /* True, iff we're generating fast turn around debugging code. When
468 true, we arrange for function prologues to start with 5 nops so
469 that gdb may insert code to redirect them, and for data to be
470 accessed indirectly. The runtime uses this indirection to forward
471 references for data to the original instance of that data. */
472
473 #define TARGET_FIX_AND_CONTINUE (darwin_fix_and_continue)
474
475 /* This is the reserved direct dispatch address for Objective-C. */
476 #define OFFS_MSGSEND_FAST 0xFFFEFF00
477
478 /* This is the reserved ivar address Objective-C. */
479 #define OFFS_ASSIGNIVAR_FAST 0xFFFEFEC0
480
481 /* Old versions of Mac OS/Darwin don't have C99 functions available. */
482 #undef TARGET_LIBC_HAS_FUNCTION
483 #define TARGET_LIBC_HAS_FUNCTION darwin_libc_has_function
484
485 /* When generating kernel code or kexts, we don't use Altivec by
486 default, as kernel code doesn't save/restore those registers. */
487 #define OS_MISSING_ALTIVEC (flag_mkernel || flag_apple_kext)
488
489 /* Darwin has support for section anchors on powerpc*.
490 It is disabled for any section containing a "zero-sized item" (because these
491 are re-written as size=1 to be compatible with the OSX ld64).
492 The re-writing would interfere with the computation of anchor offsets.
493 Therefore, we place zero-sized items in their own sections and make such
494 sections unavailable to section anchoring. */
495
496 #undef TARGET_ASM_OUTPUT_ANCHOR
497 #define TARGET_ASM_OUTPUT_ANCHOR darwin_asm_output_anchor
498
499 #undef TARGET_USE_ANCHORS_FOR_SYMBOL_P
500 #define TARGET_USE_ANCHORS_FOR_SYMBOL_P darwin_use_anchors_for_symbol_p
501
502 #undef DARWIN_SECTION_ANCHORS
503 #define DARWIN_SECTION_ANCHORS 1
504
505 /* PPC Darwin has to rename some of the long double builtins. */
506 #undef SUBTARGET_INIT_BUILTINS
507 #define SUBTARGET_INIT_BUILTINS \
508 do { \
509 darwin_patch_builtins (); \
510 rs6000_builtin_decls[(unsigned) (RS6000_BIF_CFSTRING)] \
511 = darwin_init_cfstring_builtins ((unsigned) (RS6000_BIF_CFSTRING)); \
512 } while(0)
513
514 /* So far, there is no rs6000_fold_builtin, if one is introduced, then
515 this will need to be modified similar to the x86 case. */
516 #define TARGET_FOLD_BUILTIN SUBTARGET_FOLD_BUILTIN
517
518 /* First available SYMBOL flag bit for use by subtargets. */
519 #define SYMBOL_FLAG_SUBT_DEP (SYMBOL_FLAG_MACH_DEP)
520
521 /* Use standard DWARF numbering for DWARF debugging information. */
522 #define RS6000_USE_DWARF_NUMBERING
523