1 /* Target definitions for x86 running Darwin.
2 Copyright (C) 2001, 2002, 2004, 2005, 2006 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
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
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.
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
19 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
20 Boston, MA 02110-1301, USA. */
22 /* Enable Mach-O bits in generic x86 code. */
24 #define TARGET_MACHO 1
26 #define TARGET_VERSION fprintf (stderr, " (i686 Darwin)");
29 #define TARGET_64BIT OPTION_ISA_64BIT
34 #define TARGET_64BIT 1
36 #define TARGET_64BIT 0
40 /* Size of the Obj-C jump buffer. */
41 #define OBJC_JBLEN ((TARGET_64BIT) ? ((9 * 2) + 3 + 16) : (18))
43 #undef TARGET_FPMATH_DEFAULT
44 #define TARGET_FPMATH_DEFAULT (TARGET_SSE ? FPMATH_SSE : FPMATH_387)
46 #define TARGET_OS_CPP_BUILTINS() \
49 builtin_define ("__LITTLE_ENDIAN__"); \
50 darwin_cpp_builtins (pfile); \
55 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
58 #define WCHAR_TYPE "int"
60 #undef WCHAR_TYPE_SIZE
61 #define WCHAR_TYPE_SIZE 32
63 #undef MAX_BITS_PER_WORD
64 #define MAX_BITS_PER_WORD 64
66 #undef FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
67 #define FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN (0)
69 #undef TARGET_KEEPS_VECTOR_ALIGNED_STACK
70 #define TARGET_KEEPS_VECTOR_ALIGNED_STACK 1
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
76 #define STACK_BOUNDARY 128
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 \
88 /* We want -fPIC by default, unless we're using -static to compile for
89 the kernel or some such. */
92 #define CC1_SPEC "%{!mkernel:%{!static:%{!mdynamic-no-pic:-fPIC}}} \
93 %{!mmacosx-version-min=*:-mmacosx-version-min=%(darwin_minversion)} \
94 %{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }}"
97 #define ASM_SPEC "-arch %(darwin_arch) -force_cpusubtype_ALL"
99 #define DARWIN_ARCH_SPEC "%{m64:x86_64;:i386}"
100 #define DARWIN_SUBARCH_SPEC DARWIN_ARCH_SPEC
102 /* Determine a minimum version based on compiler options. */
103 #define DARWIN_MINVERSION_SPEC \
104 "%{!m64|fgnu-runtime:10.4; \
105 ,objective-c|,objc-cpp-output:10.5; \
106 ,objective-c-header:10.5; \
107 ,objective-c++|,objective-c++-cpp-output:10.5; \
108 ,objective-c++-header|,objc++-cpp-output:10.5; \
111 #undef SUBTARGET_EXTRA_SPECS
112 #define SUBTARGET_EXTRA_SPECS \
114 { "darwin_arch", DARWIN_ARCH_SPEC }, \
115 { "darwin_crt2", "" }, \
116 { "darwin_subarch", DARWIN_SUBARCH_SPEC },
118 /* Use the following macro for any Darwin/x86-specific command-line option
120 #define SUBTARGET_OPTION_TRANSLATE_TABLE \
123 /* The Darwin assembler mostly follows AT&T syntax. */
124 #undef ASSEMBLER_DIALECT
125 #define ASSEMBLER_DIALECT ASM_ATT
127 /* Define macro used to output shift-double opcodes when the shift
128 count is in %cl. Some assemblers require %cl as an argument;
129 some don't. This macro controls what to do: by default, don't
132 #define SHIFT_DOUBLE_OMITS_COUNT 0
134 extern void darwin_x86_file_end (void);
135 #undef TARGET_ASM_FILE_END
136 #define TARGET_ASM_FILE_END darwin_x86_file_end
138 /* Define the syntax of pseudo-ops, labels and comments. */
140 /* String containing the assembler's comment-starter. */
142 #define ASM_COMMENT_START "#"
144 /* By default, target has a 80387, uses IEEE compatible arithmetic,
145 and returns float values in the 387. */
147 #undef TARGET_SUBTARGET_DEFAULT
148 #define TARGET_SUBTARGET_DEFAULT (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_128BIT_LONG_DOUBLE)
150 /* For darwin we want to target specific processor features as a minimum,
151 but these unfortunately don't correspond to a specific processor. */
152 #undef TARGET_SUBTARGET32_ISA_DEFAULT
153 #define TARGET_SUBTARGET32_ISA_DEFAULT (OPTION_MASK_ISA_MMX \
154 | OPTION_MASK_ISA_SSE \
155 | OPTION_MASK_ISA_SSE2)
157 #undef TARGET_SUBTARGET64_ISA_DEFAULT
158 #define TARGET_SUBTARGET64_ISA_DEFAULT (OPTION_MASK_ISA_MMX \
159 | OPTION_MASK_ISA_SSE \
160 | OPTION_MASK_ISA_SSE2 \
161 | OPTION_MASK_ISA_SSE3)
163 /* For now, disable dynamic-no-pic. We'll need to go through i386.c
164 with a fine-tooth comb looking for refs to flag_pic! */
165 #define MASK_MACHO_DYNAMIC_NO_PIC 0
166 #define TARGET_DYNAMIC_NO_PIC (target_flags & MASK_MACHO_DYNAMIC_NO_PIC)
168 #undef GOT_SYMBOL_NAME
169 #define GOT_SYMBOL_NAME (machopic_function_base_name ())
171 /* Define the syntax of pseudo-ops, labels and comments. */
175 /* These are used by -fbranch-probabilities */
176 #define HOT_TEXT_SECTION_NAME "__TEXT,__text,regular,pure_instructions"
177 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME \
178 "__TEXT,__unlikely,regular,pure_instructions"
180 /* Assembler pseudos to introduce constants of various size. */
182 #define ASM_BYTE_OP "\t.byte\t"
183 #define ASM_SHORT "\t.word\t"
184 #define ASM_LONG "\t.long\t"
185 #define ASM_QUAD "\t.quad\t"
187 #define SUBTARGET_ENCODE_SECTION_INFO darwin_encode_section_info
189 #undef ASM_OUTPUT_ALIGN
190 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
191 do { if ((LOG) != 0) \
193 if (in_section == text_section) \
194 fprintf (FILE, "\t%s %d,0x90\n", ALIGN_ASM_OP, (LOG)); \
196 fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG)); \
200 /* This says how to output an assembler line
201 to define a global common symbol. */
203 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \
204 ( fputs (".comm ", (FILE)), \
205 assemble_name ((FILE), (NAME)), \
206 fprintf ((FILE), ",%lu\n", (unsigned long)(ROUNDED)))
208 /* This says how to output an assembler line
209 to define a local common symbol. */
211 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \
212 ( fputs (".lcomm ", (FILE)), \
213 assemble_name ((FILE), (NAME)), \
214 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", (ROUNDED)))
216 /* Darwin profiling -- call mcount. */
217 #undef FUNCTION_PROFILER
218 #define FUNCTION_PROFILER(FILE, LABELNO) \
220 if (MACHOPIC_INDIRECT && !TARGET_64BIT) \
222 const char *name = machopic_mcount_stub_name (); \
223 fprintf (FILE, "\tcall %s\n", name+1); /* skip '&' */ \
224 machopic_validate_stub_or_non_lazy_ptr (name); \
226 else fprintf (FILE, "\tcall mcount\n"); \
229 #define C_COMMON_OVERRIDE_OPTIONS \
231 SUBTARGET_C_COMMON_OVERRIDE_OPTIONS; \
234 /* Darwin on x86_64 uses dwarf-2 by default. Pre-darwin9 32-bit
235 compiles default to stabs+. darwin9+ defaults to dwarf-2. */
236 #ifndef DARWIN_PREFER_DWARF
237 #undef PREFERRED_DEBUGGING_TYPE
238 #define PREFERRED_DEBUGGING_TYPE (TARGET_64BIT ? DWARF2_DEBUG : DBX_DEBUG)
241 /* Darwin uses the standard DWARF register numbers but the default
242 register numbers for STABS. Fortunately for 64-bit code the
243 default and the standard are the same. */
244 #undef DBX_REGISTER_NUMBER
245 #define DBX_REGISTER_NUMBER(n) \
246 (TARGET_64BIT ? dbx64_register_map[n] \
247 : write_symbols == DWARF2_DEBUG ? svr4_dbx_register_map[n] \
248 : dbx_register_map[n])
250 /* Unfortunately, the 32-bit EH information also doesn't use the standard
251 DWARF register numbers. */
252 #define DWARF2_FRAME_REG_OUT(n, for_eh) \
253 (! (for_eh) || write_symbols != DWARF2_DEBUG || TARGET_64BIT ? (n) \
256 : (n) >= 11 && (n) <= 18 ? (n) + 1 \
259 #undef REGISTER_TARGET_PRAGMAS
260 #define REGISTER_TARGET_PRAGMAS() DARWIN_REGISTER_TARGET_PRAGMAS()
262 #undef TARGET_SET_DEFAULT_TYPE_ATTRIBUTES
263 #define TARGET_SET_DEFAULT_TYPE_ATTRIBUTES darwin_set_default_type_attributes
265 /* For 64-bit, we need to add 4 because @GOTPCREL is relative to the
266 end of the instruction, but without the 4 we'd only have the right
267 address for the start of the instruction. */
268 #undef ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX
269 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \
272 if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_pcrel) \
274 fputs (ASM_LONG, FILE); \
275 assemble_name (FILE, XSTR (ADDR, 0)); \
276 fputs ("+4@GOTPCREL", FILE); \
282 if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1)) \
284 darwin_non_lazy_pcrel (FILE, ADDR); \
289 /* This needs to move since i386 uses the first flag and other flags are
291 #undef MACHO_SYMBOL_FLAG_VARIABLE
292 #define MACHO_SYMBOL_FLAG_VARIABLE ((SYMBOL_FLAG_MACH_DEP) << 3)