// to each stack below the usual guard area for OS-specific
	// purposes like signal handling. Used on Windows, Plan 9,
	// and iOS because they do not use a separate stack.
	stackSystem = goos.IsWindows*512*goarch.PtrSize + goos.IsPlan9*512 + goos.IsIos*goarch.IsArm64*1024

	// The minimum size of stack used by Go code
	stackMin = 2048

	// The minimum stack size to allocate.
	// The hackery here rounds fixedStack0 up to a power of 2.

	//   linux/darwin/bsd | 2KB        | 4
	//   windows/32       | 4KB        | 3
	//   windows/64       | 8KB        | 2
	//   plan9            | 4KB        | 3
	_NumStackOrders = 4 - goarch.PtrSize/4*goos.IsWindows - 1*goos.IsPlan9

	// heapAddrBits is the number of bits in a heap address. On
	// amd64, addresses are sign-extended beyond heapAddrBits. On
	// other arches, they are zero-extended.
	//

				// ELF on ARM (or maybe Glibc on ARM); it is not
				// related to the fact that our own TLS storage happens
				// to take up 8 bytes.
				o = 8 + ldr.SymValue(rs)
			} else if target.IsElf() || target.IsPlan9() || target.IsDarwin() {
				o = int64(syms.Tlsoffset) + r.Add()
			} else if target.IsWindows() {
				o = r.Add()
			} else {
				log.Fatalf("unexpected R_TLS_LE relocation for %v", target.HeadType)
			}