1/* Copyright (C) 2005-2022 Free Software Foundation, Inc. 2 3This file is part of GCC. 4 5GCC is free software; you can redistribute it and/or modify it under 6the terms of the GNU General Public License as published by the Free 7Software Foundation; either version 3, or (at your option) any later 8version. 9 10GCC is distributed in the hope that it will be useful, but WITHOUT ANY 11WARRANTY; without even the implied warranty of MERCHANTABILITY or 12FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13for more details. 14 15You should have received a copy of the GNU General Public License 16along with GCC; see the file COPYING3. If not see 17<http://www.gnu.org/licenses/>. */ 18 19/* Since Darwin's ld will not allow zero-sized objects, and gcc wants them, 20 we emit one byte (in darwin.cc) when such an object is encountered. 21 22 This messes up section anchoring because the emitted byte is not counted 23 outside the port. To cope with this, we set aside sections for zero-sized 24 objects and disallow those sections from participating in section anchors 25 ("zobj_" sections, below). 26 27 Items that might be coalesced by the linker are prevented from participating, 28 (and those in mergeable sections are disallowed in varasm.cc). */ 29 30/* The .text section is generated in varasm.cc */ 31DEF_SECTION (text_coal_section, SECTION_CODE|SECTION_NO_ANCHOR, 32 ".section __TEXT,__textcoal_nt,coalesced,pure_instructions", 0) 33 34/* We define a picbase thunks section separately, so that we can override the 35 def to be '.text' for versions of ld64 that handle coalescing. */ 36DEF_SECTION (picbase_thunk_section, SECTION_CODE|SECTION_NO_ANCHOR, 37 ".section __TEXT,__textcoal_nt,coalesced,pure_instructions", 0) 38 39DEF_SECTION (text_hot_section, SECTION_CODE, 40 ".section __TEXT,__text_hot,regular,pure_instructions", 0) 41DEF_SECTION (text_cold_section, SECTION_CODE, 42 ".section __TEXT,__text_cold,regular,pure_instructions", 0) 43DEF_SECTION (text_startup_section, SECTION_CODE, 44 ".section __TEXT,__text_startup,regular,pure_instructions", 0) 45DEF_SECTION (text_exit_section, SECTION_CODE, 46 ".section __TEXT,__text_exit,regular,pure_instructions", 0) 47 48DEF_SECTION (text_hot_coal_section, SECTION_CODE, 49 ".section __TEXT,__text_hot_coal,coalesced,pure_instructions", 0) 50DEF_SECTION (text_cold_coal_section, SECTION_CODE, 51 ".section __TEXT,__text_cold_coal,coalesced,pure_instructions", 0) 52DEF_SECTION (text_startup_coal_section, SECTION_CODE, 53 ".section __TEXT,__text_stt_coal,coalesced,pure_instructions", 0) 54DEF_SECTION (text_exit_coal_section, SECTION_CODE, 55 ".section __TEXT,__text_exit_coal,coalesced,pure_instructions", 0) 56 57/* const */ 58DEF_SECTION (const_section, 0, ".const", 0) 59DEF_SECTION (const_coal_section, SECTION_NO_ANCHOR, 60 ".section __TEXT,__const_coal,coalesced", 0) 61/* Place to put zero-sized to avoid issues with section anchors. */ 62DEF_SECTION (zobj_const_section, SECTION_NO_ANCHOR, 63 ".section\t__DATA,__zobj_const", 0) 64 65/* Write-able data. '.data' handled in varasm.cc */ 66DEF_SECTION (static_data_section, SECTION_WRITE, ".static_data", 0) 67DEF_SECTION (data_coal_section, SECTION_WRITE|SECTION_NO_ANCHOR, 68 ".section __DATA,__datacoal_nt,coalesced", 0) 69/* Place to put zero-sized to avoid issues with section anchors. */ 70DEF_SECTION (zobj_data_section, SECTION_WRITE|SECTION_NO_ANCHOR, 71 ".section\t__DATA,__zobj_data", 0) 72 73/* BSS - .lcomm / .zerofill __DATA,__bss sections cannot be switched to 74 explicitly (will create an assembler error). */ 75DEF_SECTION (zobj_bss_section, SECTION_WRITE|SECTION_BSS|SECTION_NO_ANCHOR, 76 ".section\t__DATA,__zobj_bss", 0) 77 78/* const data */ 79DEF_SECTION (const_data_section, 0, ".const_data", 0) 80DEF_SECTION (const_data_coal_section, SECTION_NO_ANCHOR, 81 ".section __DATA,__const_coal,coalesced", 0) 82/* Place to put zero-sized to avoid issues with section anchors. */ 83DEF_SECTION (zobj_const_data_section, SECTION_NO_ANCHOR, 84 ".section\t__DATA,__zobj_cnst_data", 0) 85 86/* Strings and other literals. */ 87DEF_SECTION (cstring_section, SECTION_MERGE | SECTION_STRINGS, ".cstring", 0) 88DEF_SECTION (literal4_section, SECTION_MERGE, ".literal4", 0) 89DEF_SECTION (literal8_section, SECTION_MERGE, ".literal8", 0) 90DEF_SECTION (literal16_section, SECTION_MERGE, ".literal16", 0) 91/* Unlike constant NSStrings, constant CFStrings do not live in the 92 __OBJC segment since they may also occur in pure C or C++ programs. */ 93DEF_SECTION (cfstring_constant_object_section, 0, 94 ".section __DATA, __cfstring", 0) 95 96/* Module init, term, constructors & destructors. */ 97DEF_SECTION (mod_init_section, 0, ".mod_init_func", 0) 98DEF_SECTION (mod_term_section, 0, ".mod_term_func", 0) 99DEF_SECTION (constructor_section, 0, ".constructor", 0) 100DEF_SECTION (destructor_section, 0, ".destructor", 0) 101DEF_SECTION (static_init_section, SECTION_CODE, 102 ".section\t__TEXT,__StaticInit,regular,pure_instructions", 0) 103 104/* Objective-C ABI=0 (Original version) sections. */ 105DEF_SECTION (objc_class_section, 0, ".objc_class", 1) 106DEF_SECTION (objc_meta_class_section, 0, ".objc_meta_class", 1) 107DEF_SECTION (objc_category_section, 0, ".objc_category", 1) 108DEF_SECTION (objc_class_vars_section, 0, ".objc_class_vars", 1) 109DEF_SECTION (objc_instance_vars_section, 0, ".objc_instance_vars", 1) 110DEF_SECTION (objc_cls_meth_section, 0, ".objc_cls_meth", 1) 111DEF_SECTION (objc_inst_meth_section, 0, ".objc_inst_meth", 1) 112DEF_SECTION (objc_cat_cls_meth_section, 0, ".objc_cat_cls_meth", 1) 113DEF_SECTION (objc_cat_inst_meth_section, 0, ".objc_cat_inst_meth", 1) 114DEF_SECTION (objc_selector_refs_section, SECTION_MERGE, ".objc_message_refs", 1) 115DEF_SECTION (objc_selector_fixup_section, 0, 116 ".section __OBJC, __sel_fixup, regular, no_dead_strip", 1) 117DEF_SECTION (objc_symbols_section, 0, ".objc_symbols", 1) 118DEF_SECTION (objc_module_info_section, 0, ".objc_module_info", 1) 119DEF_SECTION (objc_protocol_section, 0, ".objc_protocol", 1) 120DEF_SECTION (objc_string_object_section, 0, ".objc_string_object", 1) 121DEF_SECTION (objc_constant_string_object_section, 0, 122 ".section __OBJC, __cstring_object, regular, no_dead_strip", 0) 123 124/* Fix-and-Continue image marker. */ 125DEF_SECTION (objc_image_info_section, 0, 126 ".section __OBJC, __image_info, regular, no_dead_strip", 1) 127DEF_SECTION (objc_class_names_section, 0, ".objc_class_names", 1) 128DEF_SECTION (objc_meth_var_names_section, 0, ".objc_meth_var_names", 1) 129DEF_SECTION (objc_meth_var_types_section, 0, ".objc_meth_var_types", 1) 130DEF_SECTION (objc_cls_refs_section, SECTION_MERGE, ".objc_cls_refs", 1) 131 132/* Stubs and symbol indirection sections. */ 133/* lazy symbol pointers. */ 134DEF_SECTION (machopic_lazy_symbol_ptr_section, SECTION_NO_ANCHOR, 135 ".lazy_symbol_pointer", 0) 136DEF_SECTION (machopic_lazy_symbol_ptr2_section, SECTION_NO_ANCHOR, 137 ".section __DATA, __la_sym_ptr2,lazy_symbol_pointers", 0) 138DEF_SECTION (machopic_lazy_symbol_ptr3_section, SECTION_NO_ANCHOR, 139 ".section __DATA, __la_sym_ptr3,lazy_symbol_pointers", 0) 140/* non-lazy symbol pointers. */ 141DEF_SECTION (machopic_nl_symbol_ptr_section, SECTION_NO_ANCHOR, 142 MACHOPIC_NL_SYMBOL_PTR_SECTION, 0) 143/* Symbol stubs. */ 144DEF_SECTION (machopic_symbol_stub_section, SECTION_NO_ANCHOR, 145 ".symbol_stub", 0) 146DEF_SECTION (machopic_symbol_stub1_section, SECTION_NO_ANCHOR, 147 ".section __TEXT,__symbol_stub1,symbol_stubs," 148 "pure_instructions,16", 0) 149/* PIC symbol stubs. */ 150DEF_SECTION (machopic_picsymbol_stub_section, SECTION_NO_ANCHOR, 151 ".picsymbol_stub", 0) 152DEF_SECTION (machopic_picsymbol_stub1_section, SECTION_NO_ANCHOR, 153 ".section __TEXT,__picsymbolstub1,symbol_stubs," 154 "pure_instructions,32", 0) 155DEF_SECTION (machopic_picsymbol_stub2_section, SECTION_NO_ANCHOR, 156 ".section __TEXT,__picsymbolstub2,symbol_stubs,pure_instructions,25", 0) 157DEF_SECTION (machopic_picsymbol_stub3_section, SECTION_NO_ANCHOR, 158 ".section __IMPORT,__jump_table,symbol_stubs,self_modifying_code+pure_instructions,5", 0) 159 160/* Exception-related. */ 161DEF_SECTION (darwin_exception_section, SECTION_NO_ANCHOR, 162 ".section __TEXT,__gcc_except_tab", 0) 163DEF_SECTION (darwin_eh_frame_section, SECTION_NO_ANCHOR, 164 ".section " EH_FRAME_SECTION_NAME ",__eh_frame" 165 EH_FRAME_SECTION_ATTR, 0) 166 167/* Sections for ObjC ABI=1 (ObjC 'V1' extensions) */ 168DEF_SECTION (objc1_class_ext_section, 0, 169 ".section __OBJC, __class_ext, regular, no_dead_strip", 1) 170DEF_SECTION (objc1_prop_list_section, 0, 171 ".section __OBJC, __property, regular, no_dead_strip", 1) 172DEF_SECTION (objc1_protocol_ext_section, 0, 173 ".section __OBJC, __protocol_ext, regular, no_dead_strip", 1) 174 175/* Sections for ObjC ABI=2 (m64). */ 176DEF_SECTION (objc2_message_refs_section, 0, 177 ".section __DATA, __objc_msgrefs, regular, no_dead_strip", 1) 178DEF_SECTION (objc2_classdefs_section, 0, ".section __DATA, __objc_data", 1) 179DEF_SECTION (objc2_metadata_section, 0, ".section __DATA, __objc_const", 1) 180 181DEF_SECTION (objc2_classrefs_section, 0, 182 ".section __DATA, __objc_classrefs, regular, no_dead_strip", 1) 183DEF_SECTION (objc2_classlist_section, 0, 184 ".section __DATA, __objc_classlist, regular, no_dead_strip", 1) 185DEF_SECTION (objc2_categorylist_section, 0, 186 ".section __DATA, __objc_catlist, regular, no_dead_strip", 1) 187DEF_SECTION (objc2_selector_refs_section, 0, 188 ".section __DATA, __objc_selrefs, literal_pointers, no_dead_strip", 1) 189DEF_SECTION (objc2_nonlazy_class_section, 0, 190 ".section __DATA, __objc_nlclslist, regular, no_dead_strip", 1) 191DEF_SECTION (objc2_nonlazy_category_section, 0, 192 ".section __DATA, __objc_nlcatlist, regular, no_dead_strip", 1) 193DEF_SECTION (objc2_protocollist_section, 0, 194 ".section __DATA, __objc_protolist, regular, no_dead_strip", 1) 195DEF_SECTION (objc2_protocolrefs_section, 0, 196 ".section __DATA, __objc_protorefs, regular, no_dead_strip", 1) 197DEF_SECTION (objc2_super_classrefs_section, 0, 198 ".section __DATA, __objc_superrefs, regular, no_dead_strip", 1) 199DEF_SECTION (objc2_image_info_section, 0, 200 ".section __DATA, __objc_imageinfo, regular, no_dead_strip", 1) 201DEF_SECTION (objc2_constant_string_object_section, 0, 202 ".section __DATA, __objc_stringobj, regular, no_dead_strip", 1) 203 204/* Additions for compatibility with later runtime conventions especially for 205 sections containing strings. */ 206DEF_SECTION (objc2_data_section, 0, ".section __DATA, __data", 1) 207 208DEF_SECTION (objc2_ivar_section, 0, ".section __DATA, __objc_ivar", 1) 209 210DEF_SECTION (objc2_class_names_section, 0, 211 ".section __TEXT, __objc_classname, cstring_literals", 1) 212 213DEF_SECTION (objc2_method_names_section, 0, 214 ".section __TEXT, __objc_methname, cstring_literals", 1) 215 216DEF_SECTION (objc2_method_types_section, 0, 217 ".section __TEXT, __objc_methtype, cstring_literals", 1) 218