func linknew(arch *LinkArch) *Link { ctxt := &Link{ Hash: []map[string]*LSym{ // preallocate about 2mb for hash of // non static symbols make(map[string]*LSym, 100000), }, Allsym: make([]*LSym, 0, 100000), Arch: arch, Goroot: obj.Getgoroot(), } p := obj.Getgoarch() if p != arch.Name { log.Fatalf("invalid goarch %s (want %s)", p, arch.Name) } ctxt.Headtype = headtype(obj.Getgoos()) if ctxt.Headtype < 0 { log.Fatalf("unknown goos %s", obj.Getgoos()) } // Record thread-local storage offset. // TODO(rsc): Move tlsoffset back into the linker. switch ctxt.Headtype { default: log.Fatalf("unknown thread-local storage offset for %s", Headstr(ctxt.Headtype)) case obj.Hplan9, obj.Hwindows: break /* * ELF uses TLS offset negative from FS. * Translate 0(FS) and 8(FS) into -16(FS) and -8(FS). * Known to low-level assembly in package runtime and runtime/cgo. */ case obj.Hlinux, obj.Hfreebsd, obj.Hnetbsd, obj.Hopenbsd, obj.Hdragonfly, obj.Hsolaris: if obj.Getgoos() == "android" { switch ctxt.Arch.Thechar { case '6': // Android/amd64 constant - offset from 0(FS) to our TLS slot. // Explained in src/runtime/cgo/gcc_android_*.c ctxt.Tlsoffset = 0x1d0 case '8': // Android/386 constant - offset from 0(GS) to our TLS slot. ctxt.Tlsoffset = 0xf8 default: ctxt.Tlsoffset = -1 * ctxt.Arch.Ptrsize } } else { ctxt.Tlsoffset = -1 * ctxt.Arch.Ptrsize } case obj.Hnacl: switch ctxt.Arch.Thechar { default: log.Fatalf("unknown thread-local storage offset for nacl/%s", ctxt.Arch.Name) case '5': ctxt.Tlsoffset = 0 case '6': ctxt.Tlsoffset = 0 case '8': ctxt.Tlsoffset = -8 } /* * OS X system constants - offset from 0(GS) to our TLS. * Explained in src/runtime/cgo/gcc_darwin_*.c. */ case obj.Hdarwin: switch ctxt.Arch.Thechar { default: log.Fatalf("unknown thread-local storage offset for darwin/%s", ctxt.Arch.Name) case '5': ctxt.Tlsoffset = 0 // dummy value, not needed case '6': ctxt.Tlsoffset = 0x8a0 case '7': ctxt.Tlsoffset = 0 // dummy value, not needed case '8': ctxt.Tlsoffset = 0x468 } } // On arm, record goarm. if ctxt.Arch.Thechar == '5' { ctxt.Goarm = obj.Getgoarm() } return ctxt }
func linknew(arch *LinkArch) *Link { ctxt := new(Link) ctxt.Hash = make(map[symVer]*LSym) ctxt.Arch = arch ctxt.Version = obj.HistVersion ctxt.Goroot = obj.Getgoroot() p := obj.Getgoarch() if p != arch.Name { log.Fatalf("invalid goarch %s (want %s)", p, arch.Name) } var buf string buf, _ = os.Getwd() if buf == "" { buf = "/???" } buf = filepath.ToSlash(buf) ctxt.Headtype = headtype(obj.Getgoos()) if ctxt.Headtype < 0 { log.Fatalf("unknown goos %s", obj.Getgoos()) } // Record thread-local storage offset. // TODO(rsc): Move tlsoffset back into the linker. switch ctxt.Headtype { default: log.Fatalf("unknown thread-local storage offset for %s", Headstr(ctxt.Headtype)) case obj.Hplan9, obj.Hwindows: break /* * ELF uses TLS offset negative from FS. * Translate 0(FS) and 8(FS) into -16(FS) and -8(FS). * Known to low-level assembly in package runtime and runtime/cgo. */ case obj.Hlinux, obj.Hfreebsd, obj.Hnetbsd, obj.Hopenbsd, obj.Hdragonfly, obj.Hsolaris: if obj.Getgoos() == "android" && ctxt.Arch.Thechar == '6' { // Android/x86 constant - offset from 0(FS) to our // TLS slot. Explained in src/runtime/cgo/gcc_android_*.c ctxt.Tlsoffset = 0x1d0 } else { ctxt.Tlsoffset = -1 * ctxt.Arch.Ptrsize } case obj.Hnacl: switch ctxt.Arch.Thechar { default: log.Fatalf("unknown thread-local storage offset for nacl/%s", ctxt.Arch.Name) case '5': ctxt.Tlsoffset = 0 case '6': ctxt.Tlsoffset = 0 case '8': ctxt.Tlsoffset = -8 } /* * OS X system constants - offset from 0(GS) to our TLS. * Explained in src/runtime/cgo/gcc_darwin_*.c. */ case obj.Hdarwin: switch ctxt.Arch.Thechar { default: log.Fatalf("unknown thread-local storage offset for darwin/%s", ctxt.Arch.Name) case '5': ctxt.Tlsoffset = 0 // dummy value, not needed case '6': ctxt.Tlsoffset = 0x8a0 case '7': ctxt.Tlsoffset = 0 // dummy value, not needed case '8': ctxt.Tlsoffset = 0x468 } } // On arm, record goarm. if ctxt.Arch.Thechar == '5' { ctxt.Goarm = obj.Getgoarm() } return ctxt }