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
}