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b069de3b 1/* Target definitions for x86 running Darwin.
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2 Copyright (C) 2001, 2002, 2004, 2005, 2006, 2007
3 Free Software Foundation, Inc.
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4 Contributed by Apple Computer Inc.
5
7ec022b2 6This file is part of GCC.
b069de3b 7
7ec022b2 8GCC is free software; you can redistribute it and/or modify
b069de3b 9it under the terms of the GNU General Public License as published by
2f83c7d6 10the Free Software Foundation; either version 3, or (at your option)
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11any later version.
12
7ec022b2 13GCC is distributed in the hope that it will be useful,
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14but WITHOUT ANY WARRANTY; without even the implied warranty of
15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16GNU General Public License for more details.
17
18You should have received a copy of the GNU General Public License
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19along with GCC; see the file COPYING3. If not see
20<http://www.gnu.org/licenses/>. */
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21
22/* Enable Mach-O bits in generic x86 code. */
23#undef TARGET_MACHO
24#define TARGET_MACHO 1
25
2e5d2af9 26#define TARGET_VERSION fprintf (stderr, " (i686 Darwin)");
b069de3b 27
f7288899 28#undef TARGET_64BIT
0a1c5e55 29#define TARGET_64BIT OPTION_ISA_64BIT
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30
31#ifdef IN_LIBGCC2
32#undef TARGET_64BIT
33#ifdef __x86_64__
34#define TARGET_64BIT 1
35#else
36#define TARGET_64BIT 0
37#endif
38#endif
39
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40/* Size of the Obj-C jump buffer. */
41#define OBJC_JBLEN ((TARGET_64BIT) ? ((9 * 2) + 3 + 16) : (18))
42
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43#undef TARGET_FPMATH_DEFAULT
44#define TARGET_FPMATH_DEFAULT (TARGET_SSE ? FPMATH_SSE : FPMATH_387)
45
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46#define TARGET_OS_CPP_BUILTINS() \
47 do \
48 { \
b069de3b 49 builtin_define ("__LITTLE_ENDIAN__"); \
ed5b9f96 50 darwin_cpp_builtins (pfile); \
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51 } \
52 while (0)
53
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54#undef PTRDIFF_TYPE
55#define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
56
57#undef WCHAR_TYPE
58#define WCHAR_TYPE "int"
59
60#undef WCHAR_TYPE_SIZE
61#define WCHAR_TYPE_SIZE 32
62
63#undef MAX_BITS_PER_WORD
64#define MAX_BITS_PER_WORD 64
65
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66#undef FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
67#define FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN (0)
68
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69#undef TARGET_KEEPS_VECTOR_ALIGNED_STACK
70#define TARGET_KEEPS_VECTOR_ALIGNED_STACK 1
71
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72/* On Darwin, the stack is 128-bit aligned at the point of every call.
73 Failure to ensure this will lead to a crash in the system libraries
74 or dynamic loader. */
75#undef STACK_BOUNDARY
76#define STACK_BOUNDARY 128
77
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78/* Since we'll never want a stack boundary less aligned than 128 bits
79 we need the extra work here otherwise bits of gcc get very grumpy
80 when we ask for lower alignment. We could just reject values less
81 than 128 bits for Darwin, but it's easier to up the alignment if
82 it's below the minimum. */
83#undef PREFERRED_STACK_BOUNDARY
84#define PREFERRED_STACK_BOUNDARY (ix86_preferred_stack_boundary > 128 \
85 ? ix86_preferred_stack_boundary \
86 : 128)
87
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88/* We want -fPIC by default, unless we're using -static to compile for
89 the kernel or some such. */
90
91#undef CC1_SPEC
f475fd3c 92#define CC1_SPEC "%{!mkernel:%{!static:%{!mdynamic-no-pic:-fPIC}}} \
32ec6542 93 %{!mmacosx-version-min=*:-mmacosx-version-min=%(darwin_minversion)} \
910fbc16 94 %{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }}"
b069de3b 95
a56cd1a9 96#undef ASM_SPEC
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97#define ASM_SPEC "-arch %(darwin_arch) -force_cpusubtype_ALL"
98
99#define DARWIN_ARCH_SPEC "%{m64:x86_64;:i386}"
100#define DARWIN_SUBARCH_SPEC DARWIN_ARCH_SPEC
3a7e8b87 101
e4cad568 102/* Determine a minimum version based on compiler options. */
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103#define DARWIN_MINVERSION_SPEC \
104 "%{!m64|fgnu-runtime:10.4; \
105 ,objective-c|,objc-cpp-output:10.5; \
6b692a83 106 ,objective-c-header:10.5; \
48137d59 107 ,objective-c++|,objective-c++-cpp-output:10.5; \
6b692a83 108 ,objective-c++-header|,objc++-cpp-output:10.5; \
4f648002 109 :10.4}"
e4cad568 110
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111#undef ENDFILE_SPEC
112#define ENDFILE_SPEC \
113 "%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \
114 %{mpc32:crtprec32.o%s} \
115 %{mpc64:crtprec64.o%s} \
116 %{mpc80:crtprec80.o%s}"
117
3a7e8b87 118#undef SUBTARGET_EXTRA_SPECS
f7288899 119#define SUBTARGET_EXTRA_SPECS \
742163c0 120 DARWIN_EXTRA_SPECS \
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121 { "darwin_arch", DARWIN_ARCH_SPEC }, \
122 { "darwin_crt2", "" }, \
123 { "darwin_subarch", DARWIN_SUBARCH_SPEC },
3a7e8b87 124
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125/* Use the following macro for any Darwin/x86-specific command-line option
126 translation. */
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127#define SUBTARGET_OPTION_TRANSLATE_TABLE \
128 { "", "" }
8bb418a3 129
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130/* The Darwin assembler mostly follows AT&T syntax. */
131#undef ASSEMBLER_DIALECT
132#define ASSEMBLER_DIALECT ASM_ATT
133
134/* Define macro used to output shift-double opcodes when the shift
135 count is in %cl. Some assemblers require %cl as an argument;
136 some don't. This macro controls what to do: by default, don't
137 print %cl. */
138
139#define SHIFT_DOUBLE_OMITS_COUNT 0
140
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141extern void darwin_x86_file_end (void);
142#undef TARGET_ASM_FILE_END
143#define TARGET_ASM_FILE_END darwin_x86_file_end
144
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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
b42f4d62 154#undef TARGET_SUBTARGET_DEFAULT
f7288899 155#define TARGET_SUBTARGET_DEFAULT (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_128BIT_LONG_DOUBLE)
b069de3b 156
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157/* For darwin we want to target specific processor features as a minimum,
158 but these unfortunately don't correspond to a specific processor. */
159#undef TARGET_SUBTARGET32_ISA_DEFAULT
160#define TARGET_SUBTARGET32_ISA_DEFAULT (OPTION_MASK_ISA_MMX \
161 | OPTION_MASK_ISA_SSE \
162 | OPTION_MASK_ISA_SSE2)
163
164#undef TARGET_SUBTARGET64_ISA_DEFAULT
165#define TARGET_SUBTARGET64_ISA_DEFAULT (OPTION_MASK_ISA_MMX \
166 | OPTION_MASK_ISA_SSE \
167 | OPTION_MASK_ISA_SSE2 \
168 | OPTION_MASK_ISA_SSE3)
169
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170/* For now, disable dynamic-no-pic. We'll need to go through i386.c
171 with a fine-tooth comb looking for refs to flag_pic! */
172#define MASK_MACHO_DYNAMIC_NO_PIC 0
173#define TARGET_DYNAMIC_NO_PIC (target_flags & MASK_MACHO_DYNAMIC_NO_PIC)
174
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175#undef GOT_SYMBOL_NAME
176#define GOT_SYMBOL_NAME (machopic_function_base_name ())
177
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178/* Define the syntax of pseudo-ops, labels and comments. */
179
180#define LPREFIX "L"
181
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182/* These are used by -fbranch-probabilities */
183#define HOT_TEXT_SECTION_NAME "__TEXT,__text,regular,pure_instructions"
ac83f770 184#define UNLIKELY_EXECUTED_TEXT_SECTION_NAME \
a9042bb4 185 "__TEXT,__unlikely,regular,pure_instructions"
a9042bb4 186
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187/* Assembler pseudos to introduce constants of various size. */
188
189#define ASM_BYTE_OP "\t.byte\t"
190#define ASM_SHORT "\t.word\t"
191#define ASM_LONG "\t.long\t"
f7288899 192#define ASM_QUAD "\t.quad\t"
b069de3b 193
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194#define SUBTARGET_ENCODE_SECTION_INFO darwin_encode_section_info
195
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196#undef ASM_OUTPUT_ALIGN
197#define ASM_OUTPUT_ALIGN(FILE,LOG) \
198 do { if ((LOG) != 0) \
7ae8cf75 199 { \
d6b5193b 200 if (in_section == text_section) \
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201 fprintf (FILE, "\t%s %d,0x90\n", ALIGN_ASM_OP, (LOG)); \
202 else \
203 fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG)); \
204 } \
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205 } while (0)
206
207/* This says how to output an assembler line
208 to define a global common symbol. */
209
210#define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \
211( fputs (".comm ", (FILE)), \
212 assemble_name ((FILE), (NAME)), \
1c5ae962 213 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", (ROUNDED)))
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214
215/* This says how to output an assembler line
216 to define a local common symbol. */
217
218#define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \
219( fputs (".lcomm ", (FILE)), \
220 assemble_name ((FILE), (NAME)), \
58e15542 221 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", (ROUNDED)))
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222
223/* Darwin profiling -- call mcount. */
224#undef FUNCTION_PROFILER
225#define FUNCTION_PROFILER(FILE, LABELNO) \
226 do { \
f7288899 227 if (MACHOPIC_INDIRECT && !TARGET_64BIT) \
b069de3b 228 { \
11abc112 229 const char *name = machopic_mcount_stub_name (); \
b069de3b 230 fprintf (FILE, "\tcall %s\n", name+1); /* skip '&' */ \
11abc112 231 machopic_validate_stub_or_non_lazy_ptr (name); \
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232 } \
233 else fprintf (FILE, "\tcall mcount\n"); \
234 } while (0)
7405f03c 235
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236#define C_COMMON_OVERRIDE_OPTIONS \
237 do { \
238 SUBTARGET_C_COMMON_OVERRIDE_OPTIONS; \
239 } while (0)
240
80c85ca2 241/* Darwin on x86_64 uses dwarf-2 by default. Pre-darwin9 32-bit
9fc4da9d 242 compiles default to stabs+. darwin9+ defaults to dwarf-2. */
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243#ifndef DARWIN_PREFER_DWARF
244#undef PREFERRED_DEBUGGING_TYPE
245#define PREFERRED_DEBUGGING_TYPE (TARGET_64BIT ? DWARF2_DEBUG : DBX_DEBUG)
246#endif
247
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248/* Darwin uses the standard DWARF register numbers but the default
249 register numbers for STABS. Fortunately for 64-bit code the
250 default and the standard are the same. */
251#undef DBX_REGISTER_NUMBER
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252#define DBX_REGISTER_NUMBER(n) \
253 (TARGET_64BIT ? dbx64_register_map[n] \
254 : write_symbols == DWARF2_DEBUG ? svr4_dbx_register_map[n] \
255 : dbx_register_map[n])
256
257/* Unfortunately, the 32-bit EH information also doesn't use the standard
258 DWARF register numbers. */
259#define DWARF2_FRAME_REG_OUT(n, for_eh) \
260 (! (for_eh) || write_symbols != DWARF2_DEBUG || TARGET_64BIT ? (n) \
261 : (n) == 5 ? 4 \
262 : (n) == 4 ? 5 \
263 : (n) >= 11 && (n) <= 18 ? (n) + 1 \
264 : (n))
31abac07 265
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266#undef REGISTER_TARGET_PRAGMAS
267#define REGISTER_TARGET_PRAGMAS() DARWIN_REGISTER_TARGET_PRAGMAS()
268
269#undef TARGET_SET_DEFAULT_TYPE_ATTRIBUTES
270#define TARGET_SET_DEFAULT_TYPE_ATTRIBUTES darwin_set_default_type_attributes
2e71a7a3 271
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272/* For 64-bit, we need to add 4 because @GOTPCREL is relative to the
273 end of the instruction, but without the 4 we'd only have the right
274 address for the start of the instruction. */
275#undef ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX
276#define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \
277 if (TARGET_64BIT) \
278 { \
279 if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_pcrel) \
280 { \
281 fputs (ASM_LONG, FILE); \
282 assemble_name (FILE, XSTR (ADDR, 0)); \
283 fputs ("+4@GOTPCREL", FILE); \
284 goto DONE; \
285 } \
286 } \
287 else \
288 { \
289 if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1)) \
290 { \
291 darwin_non_lazy_pcrel (FILE, ADDR); \
292 goto DONE; \
293 } \
294 }
295
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296/* This needs to move since i386 uses the first flag and other flags are
297 used in Mach-O. */
298#undef MACHO_SYMBOL_FLAG_VARIABLE
299#define MACHO_SYMBOL_FLAG_VARIABLE ((SYMBOL_FLAG_MACH_DEP) << 3)