// runtime.text marker symbol(s).
	s := ldr.Lookup("runtime.text", 0)
	putelfsym(ctxt, s, elf.STT_FUNC, elfbind)
	for k, sect := range Segtext.Sections[1:] {
		n := k + 1
		if sect.Name != ".text" || (ctxt.IsAIX() && ctxt.IsExternal()) {
			// On AIX, runtime.text.X are symbols already in the symtab.
			break
		}
		s = ldr.Lookup(fmt.Sprintf("runtime.text.%d", n), 0)
		if s == 0 {
			break
		}

	if ctxt.IsDarwin() {
		bench.Start("domacho")
		ctxt.domacho()
	}
	if ctxt.IsWindows() {
		bench.Start("dope")
		ctxt.dope()
		bench.Start("windynrelocsyms")
		ctxt.windynrelocsyms()
	}
	if ctxt.IsAIX() {
		bench.Start("doxcoff")
		ctxt.doxcoff()
	}

	bench.Start("textbuildid")
	ctxt.textbuildid()
	bench.Start("addexport")
	ctxt.setArchSyms()
	ctxt.addexport()
	bench.Start("Gentext")

var BaseChunkIdx = func() ChunkIdx {
	var prefix uintptr
	if pageAlloc64Bit != 0 {
		prefix = 0xc000
	} else {
		prefix = 0x100
	}
	baseAddr := prefix * pallocChunkBytes
	if goos.IsAix != 0 {
		baseAddr += arenaBaseOffset
	}
	return ChunkIdx(chunkIndex(baseAddr))
}()

// PageBase returns an address given a chunk index and a page index
// relative to that chunk.