1 // Derived from Inferno utils/6l/obj.c and utils/6l/span.c 2 // https://bitbucket.org/inferno-os/inferno-os/src/default/utils/6l/obj.c 3 // https://bitbucket.org/inferno-os/inferno-os/src/default/utils/6l/span.c 4 // 5 // Copyright 1994-1999 Lucent Technologies Inc. All rights reserved. 6 // Portions Copyright 1995-1997 C H Forsyth (forsyth (a] 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 (a] 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/sym" 38 "log" 39 ) 40 41 func linknew(arch *sys.Arch) *Link { 42 ctxt := &Link{ 43 Syms: sym.NewSymbols(), 44 Out: &OutBuf{arch: arch}, 45 Arch: arch, 46 LibraryByPkg: make(map[string]*sym.Library), 47 } 48 49 if objabi.GOARCH != arch.Name { 50 log.Fatalf("invalid objabi.GOARCH %s (want %s)", objabi.GOARCH, arch.Name) 51 } 52 53 AtExit(func() { 54 if nerrors > 0 && ctxt.Out.f != nil { 55 ctxt.Out.f.Close() 56 mayberemoveoutfile() 57 } 58 }) 59 60 return ctxt 61 } 62 63 // computeTLSOffset records the thread-local storage offset. 64 func (ctxt *Link) computeTLSOffset() { 65 switch ctxt.HeadType { 66 default: 67 log.Fatalf("unknown thread-local storage offset for %v", ctxt.HeadType) 68 69 case objabi.Hplan9, objabi.Hwindows: 70 break 71 72 /* 73 * ELF uses TLS offset negative from FS. 74 * Translate 0(FS) and 8(FS) into -16(FS) and -8(FS). 75 * Known to low-level assembly in package runtime and runtime/cgo. 76 */ 77 case objabi.Hlinux, 78 objabi.Hfreebsd, 79 objabi.Hnetbsd, 80 objabi.Hopenbsd, 81 objabi.Hdragonfly, 82 objabi.Hsolaris: 83 if objabi.GOOS == "android" { 84 switch ctxt.Arch.Family { 85 case sys.AMD64: 86 // Android/amd64 constant - offset from 0(FS) to our TLS slot. 87 // Explained in src/runtime/cgo/gcc_android_*.c 88 ctxt.Tlsoffset = 0x1d0 89 case sys.I386: 90 // Android/386 constant - offset from 0(GS) to our TLS slot. 91 ctxt.Tlsoffset = 0xf8 92 default: 93 ctxt.Tlsoffset = -1 * ctxt.Arch.PtrSize 94 } 95 } else { 96 ctxt.Tlsoffset = -1 * ctxt.Arch.PtrSize 97 } 98 99 case objabi.Hnacl: 100 switch ctxt.Arch.Family { 101 default: 102 log.Fatalf("unknown thread-local storage offset for nacl/%s", ctxt.Arch.Name) 103 104 case sys.ARM: 105 ctxt.Tlsoffset = 0 106 107 case sys.AMD64: 108 ctxt.Tlsoffset = 0 109 110 case sys.I386: 111 ctxt.Tlsoffset = -8 112 } 113 114 /* 115 * OS X system constants - offset from 0(GS) to our TLS. 116 * Explained in src/runtime/cgo/gcc_darwin_*.c. 117 */ 118 case objabi.Hdarwin: 119 switch ctxt.Arch.Family { 120 default: 121 log.Fatalf("unknown thread-local storage offset for darwin/%s", ctxt.Arch.Name) 122 123 case sys.ARM: 124 ctxt.Tlsoffset = 0 // dummy value, not needed 125 126 case sys.AMD64: 127 ctxt.Tlsoffset = 0x8a0 128 129 case sys.ARM64: 130 ctxt.Tlsoffset = 0 // dummy value, not needed 131 132 case sys.I386: 133 ctxt.Tlsoffset = 0x468 134 } 135 } 136 137 } 138
