archive/tar: support stat and device numbers on AIX

Reviewed-on: https://go-review.googlesource.com/87198

From-SVN: r256810

gcc/go/gofrontend/MERGE

@@ -1,4 +1,4 @@
-ca805b704fc141d7ad61f8fcd3badbaa04b7e363
+3ea7fc3b918210e7248dbc51d90af20639dc4167
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.

libgo/go/archive/tar/stat_actime1.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build linux dragonfly openbsd solaris
+// +build aix linux dragonfly openbsd solaris
 
 package tar
 

libgo/go/archive/tar/stat_unix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build linux darwin dragonfly freebsd openbsd netbsd solaris
+// +build aix linux darwin dragonfly freebsd openbsd netbsd solaris
 
 package tar
 
@@ -54,6 +54,16 @@ func statUnix(fi os.FileInfo, h *Header) error {
 	if h.Typeflag == TypeChar || h.Typeflag == TypeBlock {
 		dev := uint64(sys.Rdev) // May be int32 or uint32
 		switch runtime.GOOS {
+		case "aix":
+			var major, minor uint32
+			if runtime.GOARCH == "ppc64" {
+				major = uint32((dev & 0x3fffffff00000000) >> 32)
+				minor = uint32((dev & 0x00000000ffffffff) >> 0)
+			} else {
+				major = uint32((dev >> 16) & 0xffff)
+				minor = uint32(dev & 0xffff)
+			}
+			h.Devmajor, h.Devminor = int64(major), int64(minor)
 		case "linux":
 			// Copied from golang.org/x/sys/unix/dev_linux.go.
 			major := uint32((dev & 0x00000000000fff00) >> 8)