1 /* Target definitions for PowerPC running Darwin (Mac OS X).
2 Copyright (C) 1997, 2000, 2001, 2003, 2004 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 2, 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 COPYING. If not, write to the
19 Free Software Foundation, 59 Temple Place - Suite 330, Boston,
20 MA 02111-1307, USA. */
23 #define TARGET_VERSION fprintf (stderr, " (Darwin/PowerPC)");
25 /* The "Darwin ABI" is mostly like AIX, but with some key differences. */
27 #define DEFAULT_ABI ABI_DARWIN
29 /* The object file format is Mach-O. */
31 #define TARGET_OBJECT_FORMAT OBJECT_MACHO
33 /* We're not ever going to do TOCs. */
36 #define TARGET_NO_TOC 1
38 /* Darwin switches. */
39 /* Use dynamic-no-pic codegen (no picbase reg; not suitable for shlibs.) */
40 #define MASK_MACHO_DYNAMIC_NO_PIC 0x00800000
42 #define TARGET_DYNAMIC_NO_PIC (target_flags & MASK_MACHO_DYNAMIC_NO_PIC)
44 /* Handle #pragma weak and #pragma pack. */
45 #define HANDLE_SYSV_PRAGMA 1
48 #define TARGET_OS_CPP_BUILTINS() \
51 builtin_define ("__ppc__"); \
52 builtin_define ("__POWERPC__"); \
53 builtin_define ("__NATURAL_ALIGNMENT__"); \
54 builtin_define ("__MACH__"); \
55 builtin_define ("__APPLE__"); \
61 #undef SUBTARGET_SWITCHES
62 #define SUBTARGET_SWITCHES \
63 {"dynamic-no-pic", MASK_MACHO_DYNAMIC_NO_PIC, \
64 N_("Generate code suitable for executables (NOT shared libs)")}, \
65 {"no-dynamic-no-pic", -MASK_MACHO_DYNAMIC_NO_PIC, ""},
68 /* The Darwin ABI always includes AltiVec, can't be (validly) turned
71 #define SUBTARGET_OVERRIDE_OPTIONS \
73 rs6000_altivec_abi = 1; \
74 rs6000_altivec_vrsave = 1; \
75 if (DEFAULT_ABI == ABI_DARWIN) \
77 if (MACHO_DYNAMIC_NO_PIC_P) \
80 warning ("-mdynamic-no-pic overrides -fpic or -fPIC"); \
83 else if (flag_pic == 1) \
85 /* Darwin doesn't support -fpic. */ \
86 warning ("-fpic is not supported; -fPIC assumed"); \
92 /* We want -fPIC by default, unless we're using -static to compile for
93 the kernel or some such. */
97 %{gused: -feliminate-unused-debug-symbols %<gused }\
98 %{static: %{Zdynamic: %e conflicting code gen style switches are used}}\
99 %{!static:%{!mdynamic-no-pic:-fPIC}}"
101 /* It's virtually impossible to predict all the possible combinations
102 of -mcpu and -maltivec and whatnot, so just supply
103 -force_cpusubtype_ALL if any are seen. Radar 3492132 against the
104 assembler is asking for a .machine directive so we could get this
106 #define ASM_SPEC "-arch ppc \
107 %{Zforce_cpusubtype_ALL:-force_cpusubtype_ALL} \
108 %{!Zforce_cpusubtype_ALL:%{maltivec|mcpu=*|mpowerpc64:-force_cpusubtype_ALL}}"
110 #undef SUBTARGET_EXTRA_SPECS
111 #define SUBTARGET_EXTRA_SPECS \
112 { "darwin_arch", "ppc" },
114 /* Make both r2 and r3 available for allocation. */
118 /* Base register for access to local variables of the function. */
120 #undef FRAME_POINTER_REGNUM
121 #define FRAME_POINTER_REGNUM 30
123 #undef RS6000_PIC_OFFSET_TABLE_REGNUM
124 #define RS6000_PIC_OFFSET_TABLE_REGNUM 31
126 /* Pad the outgoing args area to 16 bytes instead of the usual 8. */
128 #undef STARTING_FRAME_OFFSET
129 #define STARTING_FRAME_OFFSET \
130 (RS6000_ALIGN (current_function_outgoing_args_size, 16) \
131 + RS6000_VARARGS_AREA \
134 #undef STACK_DYNAMIC_OFFSET
135 #define STACK_DYNAMIC_OFFSET(FUNDECL) \
136 (RS6000_ALIGN (current_function_outgoing_args_size, 16) \
137 + (STACK_POINTER_OFFSET))
139 /* These are used by -fbranch-probabilities */
140 #define HOT_TEXT_SECTION_NAME "__TEXT,__text,regular,pure_instructions"
141 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME \
142 "__TEXT,__text2,regular,pure_instructions"
144 /* Define cutoff for using external functions to save floating point.
145 Currently on Darwin, always use inline stores. */
147 #undef FP_SAVE_INLINE
148 #define FP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) < 64)
150 /* The assembler wants the alternate register names, but without
151 leading percent sign. */
152 #undef REGISTER_NAMES
153 #define REGISTER_NAMES \
155 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
156 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
157 "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", \
158 "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", \
159 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
160 "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
161 "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", \
162 "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", \
163 "mq", "lr", "ctr", "ap", \
164 "cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7", \
166 "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", \
167 "v8", "v9", "v10", "v11", "v12", "v13", "v14", "v15", \
168 "v16", "v17", "v18", "v19", "v20", "v21", "v22", "v23", \
169 "v24", "v25", "v26", "v27", "v28", "v29", "v30", "v31", \
171 "spe_acc", "spefscr" \
174 /* This outputs NAME to FILE. */
176 #undef RS6000_OUTPUT_BASENAME
177 #define RS6000_OUTPUT_BASENAME(FILE, NAME) \
178 assemble_name (FILE, NAME)
180 /* Globalizing directive for a label. */
182 #define GLOBAL_ASM_OP "\t.globl "
183 #undef TARGET_ASM_GLOBALIZE_LABEL
185 /* This is how to output an internal label prefix. rs6000.c uses this
186 when generating traceback tables. */
187 /* Not really used for Darwin? */
189 #undef ASM_OUTPUT_INTERNAL_LABEL_PREFIX
190 #define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX) \
191 fprintf (FILE, "%s", PREFIX)
193 /* This says how to output an assembler line to define a global common
196 #undef ASM_OUTPUT_ALIGNED_COMMON
197 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \
198 do { fputs (".comm ", (FILE)); \
199 RS6000_OUTPUT_BASENAME ((FILE), (NAME)); \
200 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n",\
203 /* Override the standard rs6000 definition. */
205 #undef ASM_COMMENT_START
206 #define ASM_COMMENT_START ";"
208 /* FP save and restore routines. */
209 #define SAVE_FP_PREFIX "._savef"
210 #define SAVE_FP_SUFFIX ""
211 #define RESTORE_FP_PREFIX "._restf"
212 #define RESTORE_FP_SUFFIX ""
214 /* This is how to output an assembler line that says to advance
215 the location counter to a multiple of 2**LOG bytes using the
216 "nop" instruction as padding. */
218 #define ASM_OUTPUT_ALIGN_WITH_NOP(FILE,LOG) \
223 ASM_OUTPUT_ALIGN (FILE,LOG); \
225 else /* nop == ori r0,r0,0 */ \
226 fprintf (FILE, "\t.align32 %d,0x60000000\n", (LOG)); \
229 /* Generate insns to call the profiler. */
231 #define PROFILE_HOOK(LABEL) output_profile_hook (LABEL)
233 /* Function name to call to do profiling. */
235 #define RS6000_MCOUNT "*mcount"
237 /* Default processor: a G4. */
239 #undef PROCESSOR_DEFAULT
240 #define PROCESSOR_DEFAULT PROCESSOR_PPC7400
242 /* Default target flag settings. Despite the fact that STMW/LMW
243 serializes, it's still a big code size win to use them. Use FSEL by
246 #undef TARGET_DEFAULT
247 #define TARGET_DEFAULT (MASK_POWERPC | MASK_MULTIPLE | MASK_NEW_MNEMONICS \
250 /* Since Darwin doesn't do TOCs, stub this out. */
252 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE) 0
254 /* Unlike most other PowerPC targets, chars are signed, for
255 consistency with other Darwin architectures. */
257 #undef DEFAULT_SIGNED_CHAR
258 #define DEFAULT_SIGNED_CHAR (1)
260 /* Given an rtx X being reloaded into a reg required to be
261 in class CLASS, return the class of reg to actually use.
262 In general this is just CLASS; but on some machines
263 in some cases it is preferable to use a more restrictive class.
265 On the RS/6000, we have to return NO_REGS when we want to reload a
266 floating-point CONST_DOUBLE to force it to be copied to memory.
268 Don't allow R0 when loading the address of, or otherwise furtling with,
271 #undef PREFERRED_RELOAD_CLASS
272 #define PREFERRED_RELOAD_CLASS(X,CLASS) \
273 ((GET_CODE (X) == CONST_DOUBLE \
274 && GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT) \
276 : ((GET_CODE (X) == SYMBOL_REF || GET_CODE (X) == HIGH) \
277 && reg_class_subset_p (BASE_REGS, (CLASS))) \
279 : (GET_MODE_CLASS (GET_MODE (X)) == MODE_INT \
280 && (CLASS) == NON_SPECIAL_REGS) \
284 /* Fix for emit_group_load (): force large constants to be pushed via regs. */
285 #define ALWAYS_PUSH_CONSTS_USING_REGS_P 1
287 /* This now supports a natural alignment mode */
288 /* Darwin word-aligns FP doubles but doubleword-aligns 64-bit ints. */
289 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
290 (TARGET_ALIGN_NATURAL ? (COMPUTED) : \
291 (TYPE_MODE (TREE_CODE (TREE_TYPE (FIELD)) == ARRAY_TYPE \
292 ? get_inner_array_type (FIELD) \
293 : TREE_TYPE (FIELD)) == DFmode \
294 ? MIN ((COMPUTED), 32) : (COMPUTED)))
296 /* Darwin increases natural record alignment to doubleword if the first
297 field is an FP double while the FP fields remain word aligned. */
298 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED) \
299 ((TREE_CODE (STRUCT) == RECORD_TYPE \
300 || TREE_CODE (STRUCT) == UNION_TYPE \
301 || TREE_CODE (STRUCT) == QUAL_UNION_TYPE) \
302 && TARGET_ALIGN_NATURAL == 0 \
303 ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED) \
304 : (TARGET_ALTIVEC && TREE_CODE (STRUCT) == VECTOR_TYPE) \
305 ? MAX (MAX ((COMPUTED), (SPECIFIED)), 128) \
306 : MAX ((COMPUTED), (SPECIFIED)))
308 /* XXX: Darwin supports neither .quad, or .llong, but it also doesn't
309 support 64 bit PowerPC either, so this just keeps things happy. */
310 #define DOUBLE_INT_ASM_OP "\t.quad\t"
312 /* For binary compatibility with 2.95; Darwin C APIs use bool from
313 stdbool.h, which was an int-sized enum in 2.95. */
314 #define BOOL_TYPE_SIZE INT_TYPE_SIZE
316 #undef REGISTER_TARGET_PRAGMAS
317 #define REGISTER_TARGET_PRAGMAS DARWIN_REGISTER_TARGET_PRAGMAS