| // Derived from Inferno utils/6l/l.h and related files. |
| // https://bitbucket.org/inferno-os/inferno-os/src/default/utils/6l/l.h |
| // |
| // Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved. |
| // Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net) |
| // Portions Copyright © 1997-1999 Vita Nuova Limited |
| // Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com) |
| // Portions Copyright © 2004,2006 Bruce Ellis |
| // Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net) |
| // Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others |
| // Portions Copyright © 2009 The Go Authors. All rights reserved. |
| // |
| // Permission is hereby granted, free of charge, to any person obtaining a copy |
| // of this software and associated documentation files (the "Software"), to deal |
| // in the Software without restriction, including without limitation the rights |
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| // copies of the Software, and to permit persons to whom the Software is |
| // furnished to do so, subject to the following conditions: |
| // |
| // The above copyright notice and this permission notice shall be included in |
| // all copies or substantial portions of the Software. |
| // |
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| // THE SOFTWARE. |
| |
| package ld |
| |
| // A SymKind describes the kind of memory represented by a symbol. |
| type SymKind int16 |
| |
| // Defined SymKind values. |
| // |
| // TODO(rsc): Give idiomatic Go names. |
| //go:generate stringer -type=SymKind |
| const ( |
| Sxxx SymKind = iota |
| STEXT |
| SELFRXSECT |
| |
| // Read-only sections. |
| STYPE |
| SSTRING |
| SGOSTRING |
| SGOFUNC |
| SGCBITS |
| SRODATA |
| SFUNCTAB |
| |
| SELFROSECT |
| SMACHOPLT |
| |
| // Read-only sections with relocations. |
| // |
| // Types STYPE-SFUNCTAB above are written to the .rodata section by default. |
| // When linking a shared object, some conceptually "read only" types need to |
| // be written to by relocations and putting them in a section called |
| // ".rodata" interacts poorly with the system linkers. The GNU linkers |
| // support this situation by arranging for sections of the name |
| // ".data.rel.ro.XXX" to be mprotected read only by the dynamic linker after |
| // relocations have applied, so when the Go linker is creating a shared |
| // object it checks all objects of the above types and bumps any object that |
| // has a relocation to it to the corresponding type below, which are then |
| // written to sections with appropriate magic names. |
| STYPERELRO |
| SSTRINGRELRO |
| SGOSTRINGRELRO |
| SGOFUNCRELRO |
| SGCBITSRELRO |
| SRODATARELRO |
| SFUNCTABRELRO |
| |
| // Part of .data.rel.ro if it exists, otherwise part of .rodata. |
| STYPELINK |
| SITABLINK |
| SSYMTAB |
| SPCLNTAB |
| |
| // Writable sections. |
| SELFSECT |
| SMACHO |
| SMACHOGOT |
| SWINDOWS |
| SELFGOT |
| SNOPTRDATA |
| SINITARR |
| SDATA |
| SBSS |
| SNOPTRBSS |
| STLSBSS |
| SXREF |
| SMACHOSYMSTR |
| SMACHOSYMTAB |
| SMACHOINDIRECTPLT |
| SMACHOINDIRECTGOT |
| SFILE |
| SFILEPATH |
| SCONST |
| SDYNIMPORT |
| SHOSTOBJ |
| SDWARFSECT |
| SDWARFINFO |
| SDWARFRANGE |
| SSUB = SymKind(1 << 8) |
| SMASK = SymKind(SSUB - 1) |
| SHIDDEN = SymKind(1 << 9) |
| SCONTAINER = SymKind(1 << 10) // has a sub-symbol |
| ) |
| |
| // abiSymKindToSymKind maps values read from object files (which are |
| // of type cmd/internal/objabi.SymKind) to values of type SymKind. |
| var abiSymKindToSymKind = [...]SymKind{ |
| Sxxx, |
| STEXT, |
| SRODATA, |
| SNOPTRDATA, |
| SDATA, |
| SBSS, |
| SNOPTRBSS, |
| STLSBSS, |
| SDWARFINFO, |
| SDWARFRANGE, |
| } |
| |
| // readOnly are the symbol kinds that form read-only sections. In some |
| // cases, if they will require relocations, they are transformed into |
| // rel-ro sections using relROMap. |
| var readOnly = []SymKind{ |
| STYPE, |
| SSTRING, |
| SGOSTRING, |
| SGOFUNC, |
| SGCBITS, |
| SRODATA, |
| SFUNCTAB, |
| } |
| |
| // relROMap describes the transformation of read-only symbols to rel-ro |
| // symbols. |
| var relROMap = map[SymKind]SymKind{ |
| STYPE: STYPERELRO, |
| SSTRING: SSTRINGRELRO, |
| SGOSTRING: SGOSTRINGRELRO, |
| SGOFUNC: SGOFUNCRELRO, |
| SGCBITS: SGCBITSRELRO, |
| SRODATA: SRODATARELRO, |
| SFUNCTAB: SFUNCTABRELRO, |
| } |
