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1 /* Target definitions for x86 running Darwin.
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2 Copyright (C) 2001, 2002, 2004, 2005, 2006, 2007, 2008
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3 Free Software Foundation, Inc.
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4 Contributed by Apple Computer Inc.
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5
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6 This file is part of GCC.
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7
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8 GCC is free software; you can redistribute it and/or modify
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9 it under the terms of the GNU General Public License as published by
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10 the Free Software Foundation; either version 3, or (at your option)
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11 any later version.
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12
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13 GCC is distributed in the hope that it will be useful,
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14 but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 GNU General Public License for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with GCC; see the file COPYING3. If not see
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20 <http://www.gnu.org/licenses/>. */
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21
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22 /* Enable Mach-O bits in generic x86 code. */
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23 #undef TARGET_MACHO
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24 #define TARGET_MACHO 1
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25
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26 #define TARGET_VERSION fprintf (stderr, " (i686 Darwin)");
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27
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28 #undef TARGET_64BIT
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29 #define TARGET_64BIT OPTION_ISA_64BIT
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30
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31 #ifdef IN_LIBGCC2
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32 #undef TARGET_64BIT
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33 #ifdef __x86_64__
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34 #define TARGET_64BIT 1
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35 #else
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36 #define TARGET_64BIT 0
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37 #endif
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38 #endif
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39
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40 /* Size of the Obj-C jump buffer. */
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41 #define OBJC_JBLEN ((TARGET_64BIT) ? ((9 * 2) + 3 + 16) : (18))
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42
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43 #undef TARGET_FPMATH_DEFAULT
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44 #define TARGET_FPMATH_DEFAULT (TARGET_SSE ? FPMATH_SSE : FPMATH_387)
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45
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46 #define TARGET_OS_CPP_BUILTINS() \
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47 do \
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48 { \
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49 builtin_define ("__LITTLE_ENDIAN__"); \
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50 darwin_cpp_builtins (pfile); \
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51 } \
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52 while (0)
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53
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54 #undef PTRDIFF_TYPE
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55 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
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56
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57 #undef WCHAR_TYPE
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58 #define WCHAR_TYPE "int"
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59
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60 #undef WCHAR_TYPE_SIZE
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61 #define WCHAR_TYPE_SIZE 32
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62
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63 #undef MAX_BITS_PER_WORD
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64 #define MAX_BITS_PER_WORD 64
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65
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66 #undef FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
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67 #define FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN (0)
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68
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69 #undef TARGET_KEEPS_VECTOR_ALIGNED_STACK
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70 #define TARGET_KEEPS_VECTOR_ALIGNED_STACK 1
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71
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72 /* On Darwin, the stack is 128-bit aligned at the point of every call.
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73 Failure to ensure this will lead to a crash in the system libraries
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74 or dynamic loader. */
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75 #undef STACK_BOUNDARY
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76 #define STACK_BOUNDARY 128
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77
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78 #undef MAIN_STACK_BOUNDARY
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79 #define MAIN_STACK_BOUNDARY 128
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80
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81 /* Since we'll never want a stack boundary less aligned than 128 bits
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82 we need the extra work here otherwise bits of gcc get very grumpy
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83 when we ask for lower alignment. We could just reject values less
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84 than 128 bits for Darwin, but it's easier to up the alignment if
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85 it's below the minimum. */
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86 #undef PREFERRED_STACK_BOUNDARY
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87 #define PREFERRED_STACK_BOUNDARY \
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88 MAX (STACK_BOUNDARY, ix86_preferred_stack_boundary)
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89
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90 /* We want -fPIC by default, unless we're using -static to compile for
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91 the kernel or some such. */
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92
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93 #undef CC1_SPEC
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94 #define CC1_SPEC "%(cc1_cpu) \
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95 %{!mkernel:%{!static:%{!mdynamic-no-pic:-fPIC}}} \
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96 %{!mmacosx-version-min=*:-mmacosx-version-min=%(darwin_minversion)} \
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97 %{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }}"
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98
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99 #undef ASM_SPEC
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100 #define ASM_SPEC "-arch %(darwin_arch) -force_cpusubtype_ALL"
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101
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102 #define DARWIN_ARCH_SPEC "%{m64:x86_64;:i386}"
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103 #define DARWIN_SUBARCH_SPEC DARWIN_ARCH_SPEC
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104
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105 /* Determine a minimum version based on compiler options. */
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106 #define DARWIN_MINVERSION_SPEC \
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107 "%{!m64|fgnu-runtime:10.4; \
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108 ,objective-c|,objc-cpp-output:10.5; \
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109 ,objective-c-header:10.5; \
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110 ,objective-c++|,objective-c++-cpp-output:10.5; \
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111 ,objective-c++-header|,objc++-cpp-output:10.5; \
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112 :10.4}"
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113
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114 #undef ENDFILE_SPEC
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115 #define ENDFILE_SPEC \
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116 "%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \
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117 %{mpc32:crtprec32.o%s} \
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118 %{mpc64:crtprec64.o%s} \
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119 %{mpc80:crtprec80.o%s}"
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120
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121 #undef SUBTARGET_EXTRA_SPECS
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122 #define SUBTARGET_EXTRA_SPECS \
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123 DARWIN_EXTRA_SPECS \
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124 { "darwin_arch", DARWIN_ARCH_SPEC }, \
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125 { "darwin_crt2", "" }, \
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126 { "darwin_subarch", DARWIN_SUBARCH_SPEC },
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127
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128 /* Use the following macro for any Darwin/x86-specific command-line option
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129 translation. */
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130 #define SUBTARGET_OPTION_TRANSLATE_TABLE \
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131 { "", "" }
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132
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133 /* The Darwin assembler mostly follows AT&T syntax. */
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134 #undef ASSEMBLER_DIALECT
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135 #define ASSEMBLER_DIALECT ASM_ATT
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136
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137 /* Define macro used to output shift-double opcodes when the shift
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138 count is in %cl. Some assemblers require %cl as an argument;
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139 some don't. This macro controls what to do: by default, don't
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140 print %cl. */
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141
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142 #define SHIFT_DOUBLE_OMITS_COUNT 0
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143
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144 extern void darwin_x86_file_end (void);
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145 #undef TARGET_ASM_FILE_END
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146 #define TARGET_ASM_FILE_END darwin_x86_file_end
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147
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148 /* Define the syntax of pseudo-ops, labels and comments. */
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149
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150 /* String containing the assembler's comment-starter. */
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151
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152 #define ASM_COMMENT_START "#"
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153
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154 /* By default, target has a 80387, uses IEEE compatible arithmetic,
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155 and returns float values in the 387. */
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156
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157 #undef TARGET_SUBTARGET_DEFAULT
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158 #define TARGET_SUBTARGET_DEFAULT (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_128BIT_LONG_DOUBLE)
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159
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160 /* For darwin we want to target specific processor features as a minimum,
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161 but these unfortunately don't correspond to a specific processor. */
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162 #undef TARGET_SUBTARGET32_ISA_DEFAULT
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163 #define TARGET_SUBTARGET32_ISA_DEFAULT (OPTION_MASK_ISA_MMX \
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164 | OPTION_MASK_ISA_SSE \
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165 | OPTION_MASK_ISA_SSE2)
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166
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167 #undef TARGET_SUBTARGET64_ISA_DEFAULT
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168 #define TARGET_SUBTARGET64_ISA_DEFAULT (OPTION_MASK_ISA_MMX \
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169 | OPTION_MASK_ISA_SSE \
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170 | OPTION_MASK_ISA_SSE2 \
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171 | OPTION_MASK_ISA_SSE3)
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172
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173 /* For now, disable dynamic-no-pic. We'll need to go through i386.c
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174 with a fine-tooth comb looking for refs to flag_pic! */
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175 #define MASK_MACHO_DYNAMIC_NO_PIC 0
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176 #define TARGET_DYNAMIC_NO_PIC (target_flags & MASK_MACHO_DYNAMIC_NO_PIC)
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177
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178 #undef GOT_SYMBOL_NAME
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179 #define GOT_SYMBOL_NAME MACHOPIC_FUNCTION_BASE_NAME
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180
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181 /* Define the syntax of pseudo-ops, labels and comments. */
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182
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183 #define LPREFIX "L"
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184
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185 /* These are used by -fbranch-probabilities */
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186 #define HOT_TEXT_SECTION_NAME "__TEXT,__text,regular,pure_instructions"
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187 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME \
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188 "__TEXT,__unlikely,regular,pure_instructions"
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189
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190 /* Assembler pseudos to introduce constants of various size. */
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191
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192 #define ASM_BYTE_OP "\t.byte\t"
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193 #define ASM_SHORT "\t.word\t"
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194 #define ASM_LONG "\t.long\t"
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195 #define ASM_QUAD "\t.quad\t"
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196
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197 #define SUBTARGET_ENCODE_SECTION_INFO darwin_encode_section_info
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198
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199 #undef ASM_OUTPUT_ALIGN
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200 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
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201 do { if ((LOG) != 0) \
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202 { \
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203 if (in_section == text_section) \
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204 fprintf (FILE, "\t%s %d,0x90\n", ALIGN_ASM_OP, (LOG)); \
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205 else \
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206 fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG)); \
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207 } \
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208 } while (0)
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209
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210 /* This says how to output an assembler line
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211 to define a global common symbol. */
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212
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213 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \
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214 ( fputs (".comm ", (FILE)), \
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215 assemble_name ((FILE), (NAME)), \
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216 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", (ROUNDED)))
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217
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218 /* This says how to output an assembler line
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219 to define a local common symbol. */
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220
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221 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \
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222 ( fputs (".lcomm ", (FILE)), \
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223 assemble_name ((FILE), (NAME)), \
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224 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", (ROUNDED)))
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225
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226 /* Darwin profiling -- call mcount. */
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227 #undef FUNCTION_PROFILER
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228 #define FUNCTION_PROFILER(FILE, LABELNO) \
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229 do { \
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230 if (MACHOPIC_INDIRECT && !TARGET_64BIT) \
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231 { \
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232 const char *name = machopic_mcount_stub_name (); \
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233 fprintf (FILE, "\tcall %s\n", name+1); /* skip '&' */ \
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234 machopic_validate_stub_or_non_lazy_ptr (name); \
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235 } \
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236 else fprintf (FILE, "\tcall mcount\n"); \
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237 } while (0)
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238
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239 #define C_COMMON_OVERRIDE_OPTIONS \
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240 do { \
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241 SUBTARGET_C_COMMON_OVERRIDE_OPTIONS; \
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242 } while (0)
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243
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244 /* Darwin on x86_64 uses dwarf-2 by default. Pre-darwin9 32-bit
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245 compiles default to stabs+. darwin9+ defaults to dwarf-2. */
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246 #ifndef DARWIN_PREFER_DWARF
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247 #undef PREFERRED_DEBUGGING_TYPE
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248 #define PREFERRED_DEBUGGING_TYPE (TARGET_64BIT ? DWARF2_DEBUG : DBX_DEBUG)
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249 #endif
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250
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251 /* Darwin uses the standard DWARF register numbers but the default
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252 register numbers for STABS. Fortunately for 64-bit code the
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253 default and the standard are the same. */
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254 #undef DBX_REGISTER_NUMBER
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255 #define DBX_REGISTER_NUMBER(n) \
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256 (TARGET_64BIT ? dbx64_register_map[n] \
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257 : write_symbols == DWARF2_DEBUG ? svr4_dbx_register_map[n] \
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258 : dbx_register_map[n])
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259
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260 /* Unfortunately, the 32-bit EH information also doesn't use the standard
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261 DWARF register numbers. */
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262 #define DWARF2_FRAME_REG_OUT(n, for_eh) \
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263 (! (for_eh) || write_symbols != DWARF2_DEBUG || TARGET_64BIT ? (n) \
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264 : (n) == 5 ? 4 \
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265 : (n) == 4 ? 5 \
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266 : (n) >= 11 && (n) <= 18 ? (n) + 1 \
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267 : (n))
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268
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269 #undef REGISTER_SUBTARGET_PRAGMAS
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270 #define REGISTER_SUBTARGET_PRAGMAS() DARWIN_REGISTER_TARGET_PRAGMAS()
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271
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272 #undef TARGET_SET_DEFAULT_TYPE_ATTRIBUTES
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273 #define TARGET_SET_DEFAULT_TYPE_ATTRIBUTES darwin_set_default_type_attributes
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274
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275 /* For 64-bit, we need to add 4 because @GOTPCREL is relative to the
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276 end of the instruction, but without the 4 we'd only have the right
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277 address for the start of the instruction. */
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278 #undef ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX
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279 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \
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280 if (TARGET_64BIT) \
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281 { \
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282 if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_pcrel) \
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283 { \
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284 fputs (ASM_LONG, FILE); \
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285 assemble_name (FILE, XSTR (ADDR, 0)); \
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286 fputs ("+4@GOTPCREL", FILE); \
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287 goto DONE; \
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288 } \
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289 } \
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290 else \
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291 { \
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292 if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1)) \
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293 { \
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294 darwin_non_lazy_pcrel (FILE, ADDR); \
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295 goto DONE; \
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296 } \
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297 }
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298
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299 /* This needs to move since i386 uses the first flag and other flags are
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300 used in Mach-O. */
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301 #undef MACHO_SYMBOL_FLAG_VARIABLE
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302 #define MACHO_SYMBOL_FLAG_VARIABLE ((SYMBOL_FLAG_MACH_DEP) << 3)
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