1 // Derived from Inferno utils/6l/l.h and related files. 2 // https://bitbucket.org/inferno-os/inferno-os/src/master/utils/6l/l.h 3 // 4 // Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved. 5 // Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net) 6 // Portions Copyright © 1997-1999 Vita Nuova Limited 7 // Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com) 8 // Portions Copyright © 2004,2006 Bruce Ellis 9 // Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net) 10 // Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others 11 // Portions Copyright © 2009 The Go Authors. All rights reserved. 12 // 13 // Permission is hereby granted, free of charge, to any person obtaining a copy 14 // of this software and associated documentation files (the "Software"), to deal 15 // in the Software without restriction, including without limitation the rights 16 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 17 // copies of the Software, and to permit persons to whom the Software is 18 // furnished to do so, subject to the following conditions: 19 // 20 // The above copyright notice and this permission notice shall be included in 21 // all copies or substantial portions of the Software. 22 // 23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 24 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 25 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 26 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 27 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 28 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 29 // THE SOFTWARE. 30 31 package sym 32 33 import "cmd/internal/objabi" 34 35 // A SymKind describes the kind of memory represented by a symbol. 36 type SymKind uint8 37 38 // Defined SymKind values. 39 // 40 // TODO(rsc): Give idiomatic Go names. 41 // 42 //go:generate stringer -type=SymKind 43 const ( 44 Sxxx SymKind = iota 45 STEXT 46 STEXTFIPSSTART 47 STEXTFIPS 48 STEXTFIPSEND 49 STEXTEND 50 SELFRXSECT 51 SMACHOPLT 52 53 // Read-only sections. 54 STYPE 55 SSTRING 56 SGOSTRING 57 SGOFUNC 58 SGCBITS 59 SRODATA 60 SRODATAFIPSSTART 61 SRODATAFIPS 62 SRODATAFIPSEND 63 SRODATAEND 64 SFUNCTAB 65 66 SELFROSECT 67 68 // Read-only sections with relocations. 69 // 70 // Types STYPE-SFUNCTAB above are written to the .rodata section by default. 71 // When linking a shared object, some conceptually "read only" types need to 72 // be written to by relocations and putting them in a section called 73 // ".rodata" interacts poorly with the system linkers. The GNU linkers 74 // support this situation by arranging for sections of the name 75 // ".data.rel.ro.XXX" to be mprotected read only by the dynamic linker after 76 // relocations have applied, so when the Go linker is creating a shared 77 // object it checks all objects of the above types and bumps any object that 78 // has a relocation to it to the corresponding type below, which are then 79 // written to sections with appropriate magic names. 80 STYPERELRO 81 SSTRINGRELRO 82 SGOSTRINGRELRO 83 SGOFUNCRELRO 84 SGCBITSRELRO 85 SRODATARELRO 86 SFUNCTABRELRO 87 SELFRELROSECT 88 SMACHORELROSECT 89 90 // Part of .data.rel.ro if it exists, otherwise part of .rodata. 91 STYPELINK 92 SITABLINK 93 SSYMTAB 94 SPCLNTAB 95 96 // Writable sections. 97 SFirstWritable 98 SBUILDINFO 99 SFIPSINFO 100 SELFSECT 101 SMACHO 102 SMACHOGOT 103 SWINDOWS 104 SELFGOT 105 SNOPTRDATA 106 SNOPTRDATAFIPSSTART 107 SNOPTRDATAFIPS 108 SNOPTRDATAFIPSEND 109 SNOPTRDATAEND 110 SINITARR 111 SDATA 112 SDATAFIPSSTART 113 SDATAFIPS 114 SDATAFIPSEND 115 SDATAEND 116 SXCOFFTOC 117 SBSS 118 SNOPTRBSS 119 SLIBFUZZER_8BIT_COUNTER 120 SCOVERAGE_COUNTER 121 SCOVERAGE_AUXVAR 122 STLSBSS 123 SXREF 124 SMACHOSYMSTR 125 SMACHOSYMTAB 126 SMACHOINDIRECTPLT 127 SMACHOINDIRECTGOT 128 SFILEPATH 129 SDYNIMPORT 130 SHOSTOBJ 131 SUNDEFEXT // Undefined symbol for resolution by external linker 132 133 // Sections for debugging information 134 SDWARFSECT 135 // DWARF symbol types 136 SDWARFCUINFO 137 SDWARFCONST 138 SDWARFFCN 139 SDWARFABSFCN 140 SDWARFTYPE 141 SDWARFVAR 142 SDWARFRANGE 143 SDWARFLOC 144 SDWARFLINES 145 SDWARFADDR 146 147 // SEH symbol types 148 SSEHUNWINDINFO 149 SSEHSECT 150 ) 151 152 // AbiSymKindToSymKind maps values read from object files (which are 153 // of type cmd/internal/objabi.SymKind) to values of type SymKind. 154 var AbiSymKindToSymKind = [...]SymKind{ 155 objabi.Sxxx: Sxxx, 156 objabi.STEXT: STEXT, 157 objabi.STEXTFIPS: STEXTFIPS, 158 objabi.SRODATA: SRODATA, 159 objabi.SRODATAFIPS: SRODATAFIPS, 160 objabi.SNOPTRDATA: SNOPTRDATA, 161 objabi.SNOPTRDATAFIPS: SNOPTRDATAFIPS, 162 objabi.SDATA: SDATA, 163 objabi.SDATAFIPS: SDATAFIPS, 164 objabi.SBSS: SBSS, 165 objabi.SNOPTRBSS: SNOPTRBSS, 166 objabi.STLSBSS: STLSBSS, 167 objabi.SDWARFCUINFO: SDWARFCUINFO, 168 objabi.SDWARFCONST: SDWARFCONST, 169 objabi.SDWARFFCN: SDWARFFCN, 170 objabi.SDWARFABSFCN: SDWARFABSFCN, 171 objabi.SDWARFTYPE: SDWARFTYPE, 172 objabi.SDWARFVAR: SDWARFVAR, 173 objabi.SDWARFRANGE: SDWARFRANGE, 174 objabi.SDWARFLOC: SDWARFLOC, 175 objabi.SDWARFLINES: SDWARFLINES, 176 objabi.SDWARFADDR: SDWARFADDR, 177 objabi.SLIBFUZZER_8BIT_COUNTER: SLIBFUZZER_8BIT_COUNTER, 178 objabi.SCOVERAGE_COUNTER: SCOVERAGE_COUNTER, 179 objabi.SCOVERAGE_AUXVAR: SCOVERAGE_AUXVAR, 180 objabi.SSEHUNWINDINFO: SSEHUNWINDINFO, 181 } 182 183 // ReadOnly are the symbol kinds that form read-only sections. In some 184 // cases, if they will require relocations, they are transformed into 185 // rel-ro sections using relROMap. 186 var ReadOnly = []SymKind{ 187 STYPE, 188 SSTRING, 189 SGOSTRING, 190 SGOFUNC, 191 SGCBITS, 192 SRODATA, 193 SRODATAFIPSSTART, 194 SRODATAFIPS, 195 SRODATAFIPSEND, 196 SRODATAEND, 197 SFUNCTAB, 198 } 199 200 // RelROMap describes the transformation of read-only symbols to rel-ro 201 // symbols. 202 var RelROMap = map[SymKind]SymKind{ 203 STYPE: STYPERELRO, 204 SSTRING: SSTRINGRELRO, 205 SGOSTRING: SGOSTRINGRELRO, 206 SGOFUNC: SGOFUNCRELRO, 207 SGCBITS: SGCBITSRELRO, 208 SRODATA: SRODATARELRO, 209 SFUNCTAB: SFUNCTABRELRO, 210 } 211 212 // IsText returns true if t is a text type. 213 func (t SymKind) IsText() bool { 214 return STEXT <= t && t <= STEXTEND 215 } 216 217 // IsData returns true if t is any kind of data type. 218 func (t SymKind) IsData() bool { 219 return SNOPTRDATA <= t && t <= SNOPTRBSS 220 } 221 222 // IsDATA returns true if t is one of the SDATA types. 223 func (t SymKind) IsDATA() bool { 224 return SDATA <= t && t <= SDATAEND 225 } 226 227 // IsRODATA returns true if t is one of the SRODATA types. 228 func (t SymKind) IsRODATA() bool { 229 return SRODATA <= t && t <= SRODATAEND 230 } 231 232 // IsNOPTRDATA returns true if t is one of the SNOPTRDATA types. 233 func (t SymKind) IsNOPTRDATA() bool { 234 return SNOPTRDATA <= t && t <= SNOPTRDATAEND 235 } 236 237 func (t SymKind) IsDWARF() bool { 238 return SDWARFSECT <= t && t <= SDWARFADDR 239 } 240