if err != nil {
		t.Fatalf("mmap failed %s", err)
	}
	err = syscall.Mprotect(b[:pagesize], syscall.PROT_NONE)
	if err != nil {
		t.Fatalf("mprotect low failed %s\n", err)
	}
	err = syscall.Mprotect(b[2*pagesize:], syscall.PROT_NONE)
	if err != nil {
		t.Fatalf("mprotect high failed %s\n", err)
	}
	return b[pagesize : 2*pagesize]
}

func TestEqualNearPageBoundary(t *testing.T) {

			return
		}
	}
}

func testFileMode(t *testing.T, f *File, want fs.FileMode) {
	mode := f.Mode()
	if want == 0 {
		t.Errorf("%s mode: got %v, want none", f.Name, mode)
	} else if mode != want {
		t.Errorf("%s mode: want %v, got %v", f.Name, want, mode)
	}
}

func TestInvalidFiles(t *testing.T) {
	const size = 1024 * 70 // 70kb
	b := make([]byte, size)

// It returns the byte index in s of the first Unicode
// code point satisfying f(c), or -1 if none do.
func IndexFunc(s []byte, f func(r rune) bool) int {
	return indexFunc(s, f, true)
}

// LastIndexFunc interprets s as a sequence of UTF-8-encoded code points.
// It returns the byte index in s of the last Unicode
// code point satisfying f(c), or -1 if none do.
func LastIndexFunc(s []byte, f func(r rune) bool) int {

		if r2 != 0 {
			p.errorf("cannot use pseudo-register in pair")
			return
		}
		// For SB, SP, and FP, there must be a name here. 0(FP) is not legal.
		if name != "PC" && a.Name == obj.NAME_NONE {
			p.errorf("cannot reference %s without a symbol", name)
		}
		p.setPseudoRegister(a, name, false, prefix)
		return
	}
	a.Reg = r1
	if r2 != 0 {
		// TODO: Consistency in the encoding would be nice here.

		}
	case target.Type == obj.TYPE_MEM && target.Name == obj.NAME_NONE:
		// JMP 4(R0)
		*targetAddr = *target
		// On the ppc64, 9a encodes BR (CTR) as BR CTR. We do the same.
		if p.arch.Family == sys.PPC64 && target.Offset == 0 {
			targetAddr.Type = obj.TYPE_REG
		}
	case target.Type == obj.TYPE_CONST:
		// JMP $4
		*targetAddr = a[0]
	case target.Type == obj.TYPE_NONE:
		// JMP
	default: