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annotate gcc/config/darwin-sections.def @ 111:04ced10e8804

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gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
parents f6334be47118
children 84e7813d76e9
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rev   line source
111
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1 /* Copyright (C) 2005-2017 Free Software Foundation, Inc.
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2
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3 This file is part of GCC.
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4
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5 GCC is free software; you can redistribute it and/or modify it under
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6 the terms of the GNU General Public License as published by the Free
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7 Software Foundation; either version 3, or (at your option) any later
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8 version.
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9
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10 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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11 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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12 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with GCC; see the file COPYING3. If not see
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17 <http://www.gnu.org/licenses/>. */
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18
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19 /* Since Darwin's ld will not allow zero-sized objects, and gcc wants them,
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20 we emit one byte (in darwin.c) when such an object is encountered.
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21
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22 This messes up section anchoring because the emitted byte is not counted
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23 outside the port. To cope with this, we set aside sections for zero-sized
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24 objects and disallow those sections from participating in section anchors
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25 ("zobj_" sections, below).
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27 Items that might be coalesced by the linker are prevented from participating,
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28 (and those in mergeable sections are disallowed in varasm.c). */
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29
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30 /* The .text section is generated in varasm.c */
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31 DEF_SECTION (text_coal_section, SECTION_CODE|SECTION_NO_ANCHOR,
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32 ".section __TEXT,__textcoal_nt,coalesced,pure_instructions", 0)
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34 /* We define a picbase thunks section separately, so that we can override the
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35 def to be '.text' for versions of ld64 that handle coalescing. */
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36 DEF_SECTION (picbase_thunk_section, SECTION_CODE|SECTION_NO_ANCHOR,
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37 ".section __TEXT,__textcoal_nt,coalesced,pure_instructions", 0)
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38
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39 DEF_SECTION (text_hot_section, SECTION_CODE,
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40 ".section __TEXT,__text_hot,regular,pure_instructions", 0)
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41 DEF_SECTION (text_cold_section, SECTION_CODE,
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42 ".section __TEXT,__text_cold,regular,pure_instructions", 0)
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43 DEF_SECTION (text_startup_section, SECTION_CODE,
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44 ".section __TEXT,__text_startup,regular,pure_instructions", 0)
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45 DEF_SECTION (text_exit_section, SECTION_CODE,
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46 ".section __TEXT,__text_exit,regular,pure_instructions", 0)
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47
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48 DEF_SECTION (text_hot_coal_section, SECTION_CODE,
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49 ".section __TEXT,__text_hot_coal,coalesced,pure_instructions", 0)
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50 DEF_SECTION (text_cold_coal_section, SECTION_CODE,
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51 ".section __TEXT,__text_cold_coal,coalesced,pure_instructions", 0)
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52 DEF_SECTION (text_startup_coal_section, SECTION_CODE,
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53 ".section __TEXT,__text_stt_coal,coalesced,pure_instructions", 0)
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54 DEF_SECTION (text_exit_coal_section, SECTION_CODE,
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55 ".section __TEXT,__text_exit_coal,coalesced,pure_instructions", 0)
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56
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57 /* const */
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58 DEF_SECTION (const_section, 0, ".const", 0)
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59 DEF_SECTION (const_coal_section, SECTION_NO_ANCHOR,
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60 ".section __TEXT,__const_coal,coalesced", 0)
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61 /* Place to put zero-sized to avoid issues with section anchors. */
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62 DEF_SECTION (zobj_const_section, SECTION_NO_ANCHOR,
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63 ".section\t__DATA,__zobj_const", 0)
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64
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65 /* Write-able data. '.data' handled in varasm.c */
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66 DEF_SECTION (static_data_section, SECTION_WRITE, ".static_data", 0)
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67 DEF_SECTION (data_coal_section, SECTION_WRITE|SECTION_NO_ANCHOR,
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68 ".section __DATA,__datacoal_nt,coalesced", 0)
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69 /* Place to put zero-sized to avoid issues with section anchors. */
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70 DEF_SECTION (zobj_data_section, SECTION_WRITE|SECTION_NO_ANCHOR,
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71 ".section\t__DATA,__zobj_data", 0)
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72
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73 /* BSS - .lcomm / .zerofill __DATA,__bss sections cannot be switched to
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74 explicitly (will create an assembler error). */
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75 DEF_SECTION (zobj_bss_section, SECTION_WRITE|SECTION_BSS|SECTION_NO_ANCHOR,
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76 ".section\t__DATA,__zobj_bss", 0)
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78 /* const data */
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79 DEF_SECTION (const_data_section, 0, ".const_data", 0)
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80 DEF_SECTION (const_data_coal_section, SECTION_NO_ANCHOR,
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81 ".section __DATA,__const_coal,coalesced", 0)
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82 /* Place to put zero-sized to avoid issues with section anchors. */
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83 DEF_SECTION (zobj_const_data_section, SECTION_NO_ANCHOR,
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84 ".section\t__DATA,__zobj_cnst_data", 0)
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85
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86 /* Strings and other literals. */
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87 DEF_SECTION (cstring_section, SECTION_MERGE | SECTION_STRINGS, ".cstring", 0)
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88 DEF_SECTION (literal4_section, SECTION_MERGE, ".literal4", 0)
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89 DEF_SECTION (literal8_section, SECTION_MERGE, ".literal8", 0)
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90 DEF_SECTION (literal16_section, SECTION_MERGE, ".literal16", 0)
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91 /* Unlike constant NSStrings, constant CFStrings do not live in the
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92 __OBJC segment since they may also occur in pure C or C++ programs. */
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93 DEF_SECTION (cfstring_constant_object_section, 0,
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94 ".section __DATA, __cfstring", 0)
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95
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96 /* Module init, term, constructors & destructors. */
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97 DEF_SECTION (mod_init_section, 0, ".mod_init_func", 0)
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98 DEF_SECTION (mod_term_section, 0, ".mod_term_func", 0)
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99 DEF_SECTION (constructor_section, 0, ".constructor", 0)
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100 DEF_SECTION (destructor_section, 0, ".destructor", 0)
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101
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102 /* Objective-C ABI=0 (Original version) sections. */
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103 DEF_SECTION (objc_class_section, 0, ".objc_class", 1)
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104 DEF_SECTION (objc_meta_class_section, 0, ".objc_meta_class", 1)
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105 DEF_SECTION (objc_category_section, 0, ".objc_category", 1)
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106 DEF_SECTION (objc_class_vars_section, 0, ".objc_class_vars", 1)
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107 DEF_SECTION (objc_instance_vars_section, 0, ".objc_instance_vars", 1)
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108 DEF_SECTION (objc_cls_meth_section, 0, ".objc_cls_meth", 1)
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109 DEF_SECTION (objc_inst_meth_section, 0, ".objc_inst_meth", 1)
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110 DEF_SECTION (objc_cat_cls_meth_section, 0, ".objc_cat_cls_meth", 1)
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111 DEF_SECTION (objc_cat_inst_meth_section, 0, ".objc_cat_inst_meth", 1)
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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diff changeset
112 DEF_SECTION (objc_selector_refs_section, SECTION_MERGE, ".objc_message_refs", 1)
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113 DEF_SECTION (objc_selector_fixup_section, 0,
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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114 ".section __OBJC, __sel_fixup, regular, no_dead_strip", 1)
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115 DEF_SECTION (objc_symbols_section, 0, ".objc_symbols", 1)
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116 DEF_SECTION (objc_module_info_section, 0, ".objc_module_info", 1)
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117 DEF_SECTION (objc_protocol_section, 0, ".objc_protocol", 1)
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118 DEF_SECTION (objc_string_object_section, 0, ".objc_string_object", 1)
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119 DEF_SECTION (objc_constant_string_object_section, 0,
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120 ".section __OBJC, __cstring_object, regular, no_dead_strip", 0)
0
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121
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122 /* Fix-and-Continue image marker. */
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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123 DEF_SECTION (objc_image_info_section, 0,
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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124 ".section __OBJC, __image_info, regular, no_dead_strip", 1)
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125 DEF_SECTION (objc_class_names_section, 0, ".objc_class_names", 1)
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126 DEF_SECTION (objc_meth_var_names_section, 0, ".objc_meth_var_names", 1)
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127 DEF_SECTION (objc_meth_var_types_section, 0, ".objc_meth_var_types", 1)
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128 DEF_SECTION (objc_cls_refs_section, SECTION_MERGE, ".objc_cls_refs", 1)
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129
67
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diff changeset
130 /* Stubs and symbol indirection sections. */
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131 /* lazy symbol pointers. */
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132 DEF_SECTION (machopic_lazy_symbol_ptr_section, SECTION_NO_ANCHOR,
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diff changeset
133 ".lazy_symbol_pointer", 0)
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134 DEF_SECTION (machopic_lazy_symbol_ptr2_section, SECTION_NO_ANCHOR,
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diff changeset
135 ".section __DATA, __la_sym_ptr2,lazy_symbol_pointers", 0)
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 55
diff changeset
136 DEF_SECTION (machopic_lazy_symbol_ptr3_section, SECTION_NO_ANCHOR,
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parents: 55
diff changeset
137 ".section __DATA, __la_sym_ptr3,lazy_symbol_pointers", 0)
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parents: 55
diff changeset
138 /* non-lazy symbol pointers. */
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diff changeset
139 DEF_SECTION (machopic_nl_symbol_ptr_section, SECTION_NO_ANCHOR,
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diff changeset
140 MACHOPIC_NL_SYMBOL_PTR_SECTION, 0)
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parents: 55
diff changeset
141 /* Symbol stubs. */
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parents: 55
diff changeset
142 DEF_SECTION (machopic_symbol_stub_section, SECTION_NO_ANCHOR,
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 55
diff changeset
143 ".symbol_stub", 0)
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 55
diff changeset
144 DEF_SECTION (machopic_symbol_stub1_section, SECTION_NO_ANCHOR,
0
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diff changeset
145 ".section __TEXT,__symbol_stub1,symbol_stubs,"
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diff changeset
146 "pure_instructions,16", 0)
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diff changeset
147 /* PIC symbol stubs. */
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diff changeset
148 DEF_SECTION (machopic_picsymbol_stub_section, SECTION_NO_ANCHOR,
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 55
diff changeset
149 ".picsymbol_stub", 0)
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diff changeset
150 DEF_SECTION (machopic_picsymbol_stub1_section, SECTION_NO_ANCHOR,
0
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
151 ".section __TEXT,__picsymbolstub1,symbol_stubs,"
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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diff changeset
152 "pure_instructions,32", 0)
67
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diff changeset
153 DEF_SECTION (machopic_picsymbol_stub2_section, SECTION_NO_ANCHOR,
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 55
diff changeset
154 ".section __TEXT,__picsymbolstub2,symbol_stubs,pure_instructions,25", 0)
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff changeset
155 DEF_SECTION (machopic_picsymbol_stub3_section, SECTION_NO_ANCHOR,
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 55
diff changeset
156 ".section __IMPORT,__jump_table,symbol_stubs,self_modifying_code+pure_instructions,5", 0)
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 55
diff changeset
157
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diff changeset
158 /* Exception-related. */
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diff changeset
159 DEF_SECTION (darwin_exception_section, SECTION_NO_ANCHOR,
0
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diff changeset
160 ".section __DATA,__gcc_except_tab", 0)
67
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diff changeset
161 DEF_SECTION (darwin_eh_frame_section, SECTION_NO_ANCHOR,
0
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diff changeset
162 ".section " EH_FRAME_SECTION_NAME ",__eh_frame"
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diff changeset
163 EH_FRAME_SECTION_ATTR, 0)
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diff changeset
164
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diff changeset
165 /* Sections for ObjC ABI=1 (ObjC 'V1' extensions) */
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diff changeset
166 DEF_SECTION (objc1_class_ext_section, 0,
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff changeset
167 ".section __OBJC, __class_ext, regular, no_dead_strip", 1)
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diff changeset
168 DEF_SECTION (objc1_prop_list_section, 0,
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diff changeset
169 ".section __OBJC, __property, regular, no_dead_strip", 1)
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diff changeset
170 DEF_SECTION (objc1_protocol_ext_section, 0,
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diff changeset
171 ".section __OBJC, __protocol_ext, regular, no_dead_strip", 1)
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diff changeset
172
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diff changeset
173 /* Sections for ObjC ABI=2 (m64). */
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174 DEF_SECTION (objc2_message_refs_section, 0,
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diff changeset
175 ".section __DATA, __objc_msgrefs, regular, no_dead_strip", 1)
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diff changeset
176 DEF_SECTION (objc2_classdefs_section, 0, ".section __DATA, __objc_data", 1)
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177 DEF_SECTION (objc2_metadata_section, 0, ".section __DATA, __objc_const", 1)
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diff changeset
178
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diff changeset
179 DEF_SECTION (objc2_classrefs_section, 0,
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diff changeset
180 ".section __DATA, __objc_classrefs, regular, no_dead_strip", 1)
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181 DEF_SECTION (objc2_classlist_section, 0,
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diff changeset
182 ".section __DATA, __objc_classlist, regular, no_dead_strip", 1)
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diff changeset
183 DEF_SECTION (objc2_categorylist_section, 0,
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diff changeset
184 ".section __DATA, __objc_catlist, regular, no_dead_strip", 1)
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diff changeset
185 DEF_SECTION (objc2_selector_refs_section, 0,
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff changeset
186 ".section __DATA, __objc_selrefs, literal_pointers, no_dead_strip", 1)
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diff changeset
187 DEF_SECTION (objc2_nonlazy_class_section, 0,
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff changeset
188 ".section __DATA, __objc_nlclslist, regular, no_dead_strip", 1)
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diff changeset
189 DEF_SECTION (objc2_nonlazy_category_section, 0,
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 55
diff changeset
190 ".section __DATA, __objc_nlcatlist, regular, no_dead_strip", 1)
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff changeset
191 DEF_SECTION (objc2_protocollist_section, 0,
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 55
diff changeset
192 ".section __DATA, __objc_protolist, regular, no_dead_strip", 1)
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diff changeset
193 DEF_SECTION (objc2_protocolrefs_section, 0,
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parents: 55
diff changeset
194 ".section __DATA, __objc_protorefs, regular, no_dead_strip", 1)
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diff changeset
195 DEF_SECTION (objc2_super_classrefs_section, 0,
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parents: 55
diff changeset
196 ".section __DATA, __objc_superrefs, regular, no_dead_strip", 1)
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diff changeset
197 DEF_SECTION (objc2_image_info_section, 0,
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parents: 55
diff changeset
198 ".section __DATA, __objc_imageinfo, regular, no_dead_strip", 1)
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diff changeset
199 DEF_SECTION (objc2_constant_string_object_section, 0,
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 55
diff changeset
200 ".section __DATA, __objc_stringobj, regular, no_dead_strip", 1)