1/* Target definitions for x86 running Darwin.
2   Copyright (C) 2001, 2002, 2004, 2005 Free Software Foundation, Inc.
3   Contributed by Apple Computer Inc.
4
5This file is part of GCC.
6
7GCC is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2, or (at your option)
10any later version.
11
12GCC is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with GCC; see the file COPYING.  If not, write to
19the Free Software Foundation, 51 Franklin Street, Fifth Floor,
20Boston, MA 02110-1301, USA.  */
21
22/* Enable Mach-O bits in generic x86 code.  */
23#undef TARGET_MACHO
24#define TARGET_MACHO 1
25
26#define TARGET_VERSION fprintf (stderr, " (i686 Darwin)");
27
28#undef TARGET_FPMATH_DEFAULT
29#define TARGET_FPMATH_DEFAULT (TARGET_SSE ? FPMATH_SSE : FPMATH_387)
30
31#define TARGET_OS_CPP_BUILTINS()                \
32  do                                            \
33    {                                           \
34      builtin_define ("__i386__");              \
35      builtin_define ("__LITTLE_ENDIAN__");     \
36      darwin_cpp_builtins (pfile);		\
37    }                                           \
38  while (0)
39
40/* We want -fPIC by default, unless we're using -static to compile for
41   the kernel or some such.  */
42
43#undef CC1_SPEC
44#define CC1_SPEC "%{!static:-fPIC}\
45  %{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }}"
46
47#undef ASM_SPEC
48#define ASM_SPEC "-arch i386 -force_cpusubtype_ALL"
49
50#undef SUBTARGET_EXTRA_SPECS
51#define SUBTARGET_EXTRA_SPECS					\
52  { "darwin_arch", "i386" },					\
53  { "darwin_crt2", "" },					\
54  { "darwin_subarch", "i386" },
55
56/* Use the following macro for any Darwin/x86-specific command-line option
57   translation.  */
58#define SUBTARGET_OPTION_TRANSLATE_TABLE \
59  { "", "" }
60
61/* The Darwin assembler mostly follows AT&T syntax.  */
62#undef ASSEMBLER_DIALECT
63#define ASSEMBLER_DIALECT ASM_ATT
64
65/* Define macro used to output shift-double opcodes when the shift
66   count is in %cl.  Some assemblers require %cl as an argument;
67   some don't.  This macro controls what to do: by default, don't
68   print %cl.  */
69
70#define SHIFT_DOUBLE_OMITS_COUNT 0
71
72/* Define the syntax of pseudo-ops, labels and comments.  */
73
74/* String containing the assembler's comment-starter.  */
75
76#define ASM_COMMENT_START "#"
77
78/* By default, target has a 80387, uses IEEE compatible arithmetic,
79   and returns float values in the 387.  */
80
81#define TARGET_SUBTARGET_DEFAULT (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_128BIT_LONG_DOUBLE | MASK_ALIGN_DOUBLE)
82
83/* TARGET_DEEP_BRANCH_PREDICTION is incompatible with Mach-O PIC.  */
84
85#undef TARGET_DEEP_BRANCH_PREDICTION
86#define TARGET_DEEP_BRANCH_PREDICTION   0
87
88/* For now, disable dynamic-no-pic.  We'll need to go through i386.c
89   with a fine-tooth comb looking for refs to flag_pic!  */
90#define MASK_MACHO_DYNAMIC_NO_PIC 0
91#define TARGET_DYNAMIC_NO_PIC	  (target_flags & MASK_MACHO_DYNAMIC_NO_PIC)
92
93/* Define the syntax of pseudo-ops, labels and comments.  */
94
95#define LPREFIX "L"
96
97/* These are used by -fbranch-probabilities */
98#define HOT_TEXT_SECTION_NAME "__TEXT,__text,regular,pure_instructions"
99#define UNLIKELY_EXECUTED_TEXT_SECTION_NAME \
100                              "__TEXT,__unlikely,regular,pure_instructions"
101
102/* Assembler pseudos to introduce constants of various size.  */
103
104#define ASM_BYTE_OP "\t.byte\t"
105#define ASM_SHORT "\t.word\t"
106#define ASM_LONG "\t.long\t"
107/* Darwin as doesn't do ".quad".  */
108
109#undef ASM_OUTPUT_ALIGN
110#define ASM_OUTPUT_ALIGN(FILE,LOG)	\
111 do { if ((LOG) != 0)			\
112        {				\
113          if (in_text_section ())	\
114            fprintf (FILE, "\t%s %d,0x90\n", ALIGN_ASM_OP, (LOG)); \
115          else				\
116            fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG)); \
117        }				\
118    } while (0)
119
120/* This says how to output an assembler line
121   to define a global common symbol.  */
122
123#define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)  \
124( fputs (".comm ", (FILE)),			\
125  assemble_name ((FILE), (NAME)),		\
126  fprintf ((FILE), ",%lu\n", (unsigned long)(ROUNDED)))
127
128/* This says how to output an assembler line
129   to define a local common symbol.  */
130
131#define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)  \
132( fputs (".lcomm ", (FILE)),			\
133  assemble_name ((FILE), (NAME)),		\
134  fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", (ROUNDED)))
135
136/* Darwin profiling -- call mcount.  */
137#undef FUNCTION_PROFILER
138#define FUNCTION_PROFILER(FILE, LABELNO)				\
139    do {								\
140      if (MACHOPIC_INDIRECT)						\
141	{								\
142	  const char *name = machopic_mcount_stub_name ();		\
143	  fprintf (FILE, "\tcall %s\n", name+1);  /*  skip '&'  */	\
144	  machopic_validate_stub_or_non_lazy_ptr (name);		\
145	}								\
146      else fprintf (FILE, "\tcall mcount\n");				\
147    } while (0)
148