1 /* Target definitions for x86 running Darwin.
2 Copyright (C) 2001-2023 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
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
10 any later version.
11
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public 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 /* Enable Mach-O bits in generic x86 code. */
22 #undef TARGET_MACHO
23 #define TARGET_MACHO 1
24
25 #undef DARWIN_X86
26 #define DARWIN_X86 1
27
28 /* Size of the Obj-C jump buffer. */
29 #define OBJC_JBLEN ((TARGET_64BIT) ? ((9 * 2) + 3 + 16) : (18))
30
31 #undef TARGET_FPMATH_DEFAULT
32 #define TARGET_FPMATH_DEFAULT (TARGET_SSE ? FPMATH_SSE : FPMATH_387)
33 #undef TARGET_FPMATH_DEFAULT_P
34 #define TARGET_FPMATH_DEFAULT_P(x) \
35 (TARGET_SSE_P(x) ? FPMATH_SSE : FPMATH_387)
36
37 #define TARGET_OS_CPP_BUILTINS() \
38 do { \
39 builtin_define ("__LITTLE_ENDIAN__"); \
40 darwin_cpp_builtins (pfile); \
41 } while (0)
42
43 #undef PTRDIFF_TYPE
44 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
45
46 #undef WCHAR_TYPE
47 #define WCHAR_TYPE "int"
48
49 #undef WCHAR_TYPE_SIZE
50 #define WCHAR_TYPE_SIZE 32
51
52 /* Generate pic symbol indirection stubs if this is true. */
53 #undef TARGET_MACHO_SYMBOL_STUBS
54 #define TARGET_MACHO_SYMBOL_STUBS (darwin_symbol_stubs)
55
56 /* For compatibility with OSX system tools, use the new style of pic stub
57 if this is set (default). */
58 #undef MACHOPIC_ATT_STUB
59 #define MACHOPIC_ATT_STUB (darwin_macho_att_stub)
60
61 #undef MAX_BITS_PER_WORD
62 #define MAX_BITS_PER_WORD 64
63
64 #undef FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
65 #define FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN (0)
66
67 #undef TARGET_KEEPS_VECTOR_ALIGNED_STACK
68 #define TARGET_KEEPS_VECTOR_ALIGNED_STACK 1
69
70 /* On Darwin, the stack is 128-bit aligned at the point of every call.
71 Failure to ensure this will lead to a crash in the system libraries
72 or dynamic loader. */
73
74 #undef MAIN_STACK_BOUNDARY
75 #define MAIN_STACK_BOUNDARY 128
76
77 /* Since we'll never want a stack boundary less aligned than 128 bits
78 we need the extra work here otherwise bits of gcc get very grumpy
79 when we ask for lower alignment. We could just reject values less
80 than 128 bits for Darwin, but it's easier to up the alignment if
81 it's below the minimum. */
82 #undef PREFERRED_STACK_BOUNDARY
83 #define PREFERRED_STACK_BOUNDARY \
84 MAX (128, ix86_preferred_stack_boundary)
85
86 /* We want -fPIC by default, unless we're using -static to compile for
87 the kernel or some such. */
88
89 #undef CC1_SPEC
90 #define CC1_SPEC "%(cc1_cpu) \
91 %{!mkernel:%{!static:%{!mdynamic-no-pic:-fPIC}}} \
92 %{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }} \
93 %{mx32:%eDarwin is not an mx32 platform} \
94 %{mfentry*:%eDarwin does not support -mfentry or associated options}" \
95 DARWIN_CC1_SPEC
96
97 /* This is a workaround for a tool bug: see PR100340. */
98
99 #ifdef HAVE_AS_MLLVM_X86_PAD_FOR_ALIGN
100 #define EXTRA_ASM_OPTS " -mllvm -x86-pad-for-align=false "
101 #else
102 #define EXTRA_ASM_OPTS ""
103 #endif
104
105 #undef ASM_SPEC
106 #define ASM_SPEC \
107 "%{static} -arch %(darwin_arch) " \
108 ASM_OPTIONS ASM_MMACOSX_VERSION_MIN_SPEC EXTRA_ASM_OPTS \
109 "%{!force_cpusubtype_ALL:-force_cpusubtype_ALL} "
110
111 #undef ENDFILE_SPEC
112 #define ENDFILE_SPEC \
113 "%{mdaz-ftz:crtfastmath.o%s;Ofast|ffast-math|funsafe-math-optimizations:%{!shared:%{!mno-daz-ftz:crtfastmath.o%s}}} \
114 %{mpc32:crtprec32.o%s} \
115 %{mpc64:crtprec64.o%s} \
116 %{mpc80:crtprec80.o%s}" TM_DESTRUCTOR
117
118 #ifndef DARWIN_ARCH_SPEC
119 /* We default to x86_64 for single-arch builds, bi-arch overrides. */
120 #define DARWIN_ARCH_SPEC "x86_64"
121 #define DARWIN_SUBARCH_SPEC DARWIN_ARCH_SPEC
122 #endif
123
124 #undef SUBTARGET_EXTRA_SPECS
125 #define SUBTARGET_EXTRA_SPECS \
126 DARWIN_EXTRA_SPECS \
127 { "darwin_arch", DARWIN_ARCH_SPEC }, \
128 { "darwin_crt2", "" }, \
129 { "darwin_subarch", DARWIN_ARCH_SPEC },
130
131 /* The Darwin assembler mostly follows AT&T syntax. */
132 #undef ASSEMBLER_DIALECT
133 #define ASSEMBLER_DIALECT ASM_ATT
134
135 /* Define macro used to output shift-double opcodes when the shift
136 count is in %cl. Some assemblers require %cl as an argument;
137 some don't. This macro controls what to do: by default, don't
138 print %cl. */
139
140 #define SHIFT_DOUBLE_OMITS_COUNT 0
141
142 #undef TARGET_ASM_FILE_END
143 #define TARGET_ASM_FILE_END darwin_file_end
144
145 /* Define the syntax of pseudo-ops, labels and comments. */
146
147 /* String containing the assembler's comment-starter. */
148
149 #define ASM_COMMENT_START "#"
150
151 /* By default, target has a 80387, uses IEEE compatible arithmetic,
152 and returns float values in the 387. */
153
154 #undef TARGET_SUBTARGET_DEFAULT
155 #define TARGET_SUBTARGET_DEFAULT \
156 (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_128BIT_LONG_DOUBLE)
157
158 /* For darwin we want to target specific processor features as a minimum,
159 but these unfortunately don't correspond to a specific processor. */
160 #undef TARGET_SUBTARGET32_ISA_DEFAULT
161 #define TARGET_SUBTARGET32_ISA_DEFAULT \
162 (OPTION_MASK_ISA_MMX | OPTION_MASK_ISA_SSE \
163 | OPTION_MASK_ISA_SSE2 | OPTION_MASK_ISA_SSE3)
164
165 #undef TARGET_SUBTARGET64_ISA_DEFAULT
166 #define TARGET_SUBTARGET64_ISA_DEFAULT TARGET_SUBTARGET32_ISA_DEFAULT
167
168 #undef GOT_SYMBOL_NAME
169 #define GOT_SYMBOL_NAME MACHOPIC_FUNCTION_BASE_NAME
170
171 /* Define the syntax of pseudo-ops, labels and comments. */
172
173 #define LPREFIX "L"
174
175 /* Assembler pseudos to introduce constants of various size. */
176
177 #define ASM_BYTE "\t.byte\t"
178 #define ASM_SHORT "\t.word\t"
179 #define ASM_LONG "\t.long\t"
180 #define ASM_QUAD "\t.quad\t"
181
182 #define SUBTARGET_ENCODE_SECTION_INFO darwin_encode_section_info
183
184 #undef ASM_OUTPUT_ALIGN
185 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
186 do { \
187 if ((LOG) != 0) \
188 { \
189 if (in_section == text_section) \
190 fprintf (FILE, "\t%s %d,0x90\n", ALIGN_ASM_OP, (LOG)); \
191 else \
192 fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG)); \
193 } \
194 } while (0)
195
196 /* Darwin x86 assemblers support the .ident directive. */
197
198 #undef TARGET_ASM_OUTPUT_IDENT
199 #define TARGET_ASM_OUTPUT_IDENT default_asm_output_ident_directive
200
201 /* We always want jump tables in the text section:
202 * for PIC code, we need the subtracted symbol to be defined at
203 assembly-time.
204 * for mdynamic-no-pic, we cannot support jump tables in the .const
205 section for weak functions, this looks to ld64 like direct access
206 to the weak symbol from an anonymous atom. */
207
208 #undef JUMP_TABLES_IN_TEXT_SECTION
209 #define JUMP_TABLES_IN_TEXT_SECTION 1
210
211 /* Darwin profiling -- call mcount.
212 If we need a stub, then we unconditionally mark it as used. */
213 #undef FUNCTION_PROFILER
214 #define FUNCTION_PROFILER(FILE, LABELNO) \
215 do { \
216 if (TARGET_MACHO_SYMBOL_STUBS \
217 && MACHOPIC_INDIRECT && !TARGET_64BIT) \
218 { \
219 const char *name = machopic_mcount_stub_name (); \
220 fprintf (FILE, "\tcall %s\n", name+1); /* skip '&' */ \
221 } \
222 else fprintf (FILE, "\tcall mcount\n"); \
223 } while (0)
224
225 #define C_COMMON_OVERRIDE_OPTIONS \
226 do { \
227 SUBTARGET_C_COMMON_OVERRIDE_OPTIONS; \
228 } while (0)
229
230 #undef SUBTARGET_OVERRIDE_OPTIONS
231 #define SUBTARGET_OVERRIDE_OPTIONS \
232 do { \
233 if (TARGET_64BIT && MACHO_DYNAMIC_NO_PIC_P) \
234 target_flags &= ~MASK_MACHO_DYNAMIC_NO_PIC; \
235 } while (0)
236
237 /* Darwin uses the standard DWARF register numbers but the default
238 register numbers for STABS. Fortunately for 64-bit code the
239 default and the standard are the same. */
240 #undef DEBUGGER_REGNO
241 #define DEBUGGER_REGNO(n) \
242 (TARGET_64BIT ? debugger64_register_map[n] \
243 : dwarf_debuginfo_p () ? svr4_debugger_register_map[n] \
244 : debugger_register_map[n])
245
246 /* Unfortunately, the 32-bit EH information also doesn't use the standard
247 DWARF register numbers. */
248 #define DWARF2_FRAME_REG_OUT(n, for_eh) \
249 (! (for_eh) || !dwarf_debuginfo_p () || TARGET_64BIT ? (n) \
250 : (n) == 5 ? 4 \
251 : (n) == 4 ? 5 \
252 : (n) >= 11 && (n) <= 18 ? (n) + 1 \
253 : (n))
254
255 #undef REGISTER_SUBTARGET_PRAGMAS
256 #define REGISTER_SUBTARGET_PRAGMAS() DARWIN_REGISTER_TARGET_PRAGMAS()
257
258 #undef TARGET_SET_DEFAULT_TYPE_ATTRIBUTES
259 #define TARGET_SET_DEFAULT_TYPE_ATTRIBUTES darwin_set_default_type_attributes
260
261 /* For 64-bit, we need to add 4 because @GOTPCREL is relative to the
262 end of the instruction, but without the 4 we'd only have the right
263 address for the start of the instruction. */
264 #undef ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX
265 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \
266 if (TARGET_64BIT) \
267 { \
268 if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_pcrel) \
269 { \
270 fputs (ASM_LONG, FILE); \
271 assemble_name (FILE, XSTR (ADDR, 0)); \
272 fputs ("+4@GOTPCREL", FILE); \
273 goto DONE; \
274 } \
275 } \
276 else \
277 { \
278 if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1)) \
279 { \
280 darwin_non_lazy_pcrel (FILE, ADDR); \
281 goto DONE; \
282 } \
283 }
284
285 /* First available SYMBOL flag bit for use by subtargets. */
286 #define SYMBOL_FLAG_SUBT_DEP (SYMBOL_FLAG_MACH_DEP << 5)
287
288 #undef MACHOPIC_NL_SYMBOL_PTR_SECTION
289 #define MACHOPIC_NL_SYMBOL_PTR_SECTION \
290 ".section __IMPORT,__pointers,non_lazy_symbol_pointers"
291
292 #define SUBTARGET32_DEFAULT_CPU "i686"
293
294 #undef SUBTARGET_INIT_BUILTINS
295 #define SUBTARGET_INIT_BUILTINS \
296 do { \
297 ix86_builtins[(int) IX86_BUILTIN_CFSTRING] \
298 = darwin_init_cfstring_builtins ((unsigned) (IX86_BUILTIN_CFSTRING)); \
299 darwin_rename_builtins (); \
300 } while(0)
301
302 /* Define the shadow offset for asan. */
303 #undef SUBTARGET_SHADOW_OFFSET
304 #define SUBTARGET_SHADOW_OFFSET \
305 (TARGET_LP64 ? HOST_WIDE_INT_1 << 44 : HOST_WIDE_INT_1 << 29)
306
307 #undef CLEAR_INSN_CACHE
308 #define CLEAR_INSN_CACHE(beg, end) \
309 extern void sys_icache_invalidate(void *start, size_t len); \
310 sys_icache_invalidate ((beg), (size_t)((end)-(beg)))