1 // Derived from Inferno utils/6l/obj.c and utils/6l/span.c 2 // https://bitbucket.org/inferno-os/inferno-os/src/master/utils/6l/obj.c 3 // https://bitbucket.org/inferno-os/inferno-os/src/master/utils/6l/span.c 4 // 5 // Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved. 6 // Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net) 7 // Portions Copyright © 1997-1999 Vita Nuova Limited 8 // Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com) 9 // Portions Copyright © 2004,2006 Bruce Ellis 10 // Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net) 11 // Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others 12 // Portions Copyright © 2009 The Go Authors. All rights reserved. 13 // 14 // Permission is hereby granted, free of charge, to any person obtaining a copy 15 // of this software and associated documentation files (the "Software"), to deal 16 // in the Software without restriction, including without limitation the rights 17 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 18 // copies of the Software, and to permit persons to whom the Software is 19 // furnished to do so, subject to the following conditions: 20 // 21 // The above copyright notice and this permission notice shall be included in 22 // all copies or substantial portions of the Software. 23 // 24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 25 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 26 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 27 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 28 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 29 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 30 // THE SOFTWARE. 31 32 package ld 33 34 import ( 35 "cmd/internal/objabi" 36 "cmd/internal/sys" 37 "cmd/link/internal/loader" 38 "cmd/link/internal/sym" 39 "internal/buildcfg" 40 "log" 41 "runtime" 42 ) 43 44 func linknew(arch *sys.Arch) *Link { 45 ler := loader.ErrorReporter{AfterErrorAction: afterErrorAction} 46 ctxt := &Link{ 47 Target: Target{Arch: arch}, 48 version: sym.SymVerStatic, 49 outSem: make(chan int, 2*runtime.GOMAXPROCS(0)), 50 Out: NewOutBuf(arch), 51 LibraryByPkg: make(map[string]*sym.Library), 52 numelfsym: 1, 53 ErrorReporter: ErrorReporter{ErrorReporter: ler}, 54 generatorSyms: make(map[loader.Sym]generatorFunc), 55 } 56 57 if buildcfg.GOARCH != arch.Name { 58 log.Fatalf("invalid buildcfg.GOARCH %s (want %s)", buildcfg.GOARCH, arch.Name) 59 } 60 61 AtExit(func() { 62 if nerrors > 0 { 63 ctxt.Out.ErrorClose() 64 mayberemoveoutfile() 65 } 66 }) 67 68 return ctxt 69 } 70 71 // computeTLSOffset records the thread-local storage offset. 72 // Not used for Android where the TLS offset is determined at runtime. 73 func (ctxt *Link) computeTLSOffset() { 74 switch ctxt.HeadType { 75 default: 76 log.Fatalf("unknown thread-local storage offset for %v", ctxt.HeadType) 77 78 case objabi.Hplan9, objabi.Hwindows, objabi.Hjs, objabi.Hwasip1, objabi.Haix: 79 break 80 81 case objabi.Hlinux, 82 objabi.Hfreebsd, 83 objabi.Hnetbsd, 84 objabi.Hopenbsd, 85 objabi.Hdragonfly, 86 objabi.Hsolaris: 87 /* 88 * ELF uses TLS offset negative from FS. 89 * Translate 0(FS) and 8(FS) into -16(FS) and -8(FS). 90 * Known to low-level assembly in package runtime and runtime/cgo. 91 */ 92 ctxt.Tlsoffset = -1 * ctxt.Arch.PtrSize 93 94 case objabi.Hdarwin: 95 /* 96 * OS X system constants - offset from 0(GS) to our TLS. 97 */ 98 switch ctxt.Arch.Family { 99 default: 100 log.Fatalf("unknown thread-local storage offset for darwin/%s", ctxt.Arch.Name) 101 102 /* 103 * For x86, Apple has reserved a slot in the TLS for Go. See issue 23617. 104 * That slot is at offset 0x30 on amd64. 105 * The slot will hold the G pointer. 106 * These constants should match those in runtime/sys_darwin_amd64.s 107 * and runtime/cgo/gcc_darwin_amd64.c. 108 */ 109 case sys.AMD64: 110 ctxt.Tlsoffset = 0x30 111 112 case sys.ARM64: 113 ctxt.Tlsoffset = 0 // dummy value, not needed 114 } 115 } 116 117 } 118