libgo: update to Go1.12rc1

    
    Reviewed-on: https://go-review.googlesource.com/c/162881

From-SVN: r269202

68 files changed, 2058 insertions, 236 deletions

diff --git a/gcc/go/gofrontend/MERGE b/gcc/go/gofrontend/MERGE
index a1cd924..fc7c178 100644
--- a/gcc/go/gofrontend/MERGE
+++ b/gcc/go/gofrontend/MERGE
@@ -1,4 +1,4 @@
-45a2e231958854fd945961f0335ac0805d502510
+51d2cb40a6475b126ed66cefa2aa6c8dbdc806d0
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.
diff --git a/libgo/MERGE b/libgo/MERGE
index 4674467..bf071a3 100644
--- a/libgo/MERGE
+++ b/libgo/MERGE
@@ -1,4 +1,4 @@
-4b3f04c63b5b1a1bbc4dfd71c34341ea4e935115
+1af509d46e31a14e7ff17e23b1fd84250976b405
 
 The first line of this file holds the git revision number of the
 last merge done from the master library sources.
diff --git a/libgo/VERSION b/libgo/VERSION
index b23185d..c13493b 100644
--- a/libgo/VERSION
+++ b/libgo/VERSION
@@ -1 +1 @@
-go1.12beta2
+go1.12rc1
diff --git a/libgo/go/cmd/cgo/gcc.go b/libgo/go/cmd/cgo/gcc.go
index a842972..7db702f 100644
--- a/libgo/go/cmd/cgo/gcc.go
+++ b/libgo/go/cmd/cgo/gcc.go
@@ -1139,14 +1139,19 @@ func (p *Package) mangle(f *File, arg *ast.Expr) (ast.Expr, bool) {
 }
 
 // checkIndex checks whether arg has the form &a[i], possibly inside
-// type conversions. If so, it writes
+// type conversions. If so, then in the general case it writes
 //    _cgoIndexNN := a
 //    _cgoNN := &cgoIndexNN[i] // with type conversions, if any
 // to sb, and writes
 //    _cgoCheckPointer(_cgoNN, _cgoIndexNN)
-// to sbCheck, and returns true. This tells _cgoCheckPointer to check
-// the complete contents of the slice or array being indexed, but no
-// other part of the memory allocation.
+// to sbCheck, and returns true. If a is a simple variable or field reference,
+// it writes
+//    _cgoIndexNN := &a
+// and dereferences the uses of _cgoIndexNN. Taking the address avoids
+// making a copy of an array.
+//
+// This tells _cgoCheckPointer to check the complete contents of the
+// slice or array being indexed, but no other part of the memory allocation.
 func (p *Package) checkIndex(sb, sbCheck *bytes.Buffer, arg ast.Expr, i int) bool {
 	// Strip type conversions.
 	x := arg
@@ -1166,13 +1171,23 @@ func (p *Package) checkIndex(sb, sbCheck *bytes.Buffer, arg ast.Expr, i int) boo
 		return false
 	}
 
-	fmt.Fprintf(sb, "_cgoIndex%d := %s; ", i, gofmtPos(index.X, index.X.Pos()))
+	addr := ""
+	deref := ""
+	if p.isVariable(index.X) {
+		addr = "&"
+		deref = "*"
+	}
+
+	fmt.Fprintf(sb, "_cgoIndex%d := %s%s; ", i, addr, gofmtPos(index.X, index.X.Pos()))
 	origX := index.X
 	index.X = ast.NewIdent(fmt.Sprintf("_cgoIndex%d", i))
+	if deref == "*" {
+		index.X = &ast.StarExpr{X: index.X}
+	}
 	fmt.Fprintf(sb, "_cgo%d := %s; ", i, gofmtPos(arg, arg.Pos()))
 	index.X = origX
 
-	fmt.Fprintf(sbCheck, "_cgoCheckPointer(_cgo%d, _cgoIndex%d); ", i, i)
+	fmt.Fprintf(sbCheck, "_cgoCheckPointer(_cgo%d, %s_cgoIndex%d); ", i, deref, i)
 
 	return true
 }
@@ -1298,6 +1313,17 @@ func (p *Package) isConst(f *File, x ast.Expr) bool {
 	return false
 }
 
+// isVariable reports whether x is a variable, possibly with field references.
+func (p *Package) isVariable(x ast.Expr) bool {
+	switch x := x.(type) {
+	case *ast.Ident:
+		return true
+	case *ast.SelectorExpr:
+		return p.isVariable(x.X)
+	}
+	return false
+}
+
 // rewriteUnsafe returns a version of t with references to unsafe.Pointer
 // rewritten to use _cgo_unsafe.Pointer instead.
 func (p *Package) rewriteUnsafe(t ast.Expr) ast.Expr {
diff --git a/libgo/go/cmd/cgo/godefs.go b/libgo/go/cmd/cgo/godefs.go
index 9c763a2..64384a6 100644
--- a/libgo/go/cmd/cgo/godefs.go
+++ b/libgo/go/cmd/cgo/godefs.go
@@ -127,8 +127,35 @@ func gofmt(n interface{}) string {
 	return gofmtBuf.String()
 }
 
+// gofmtLineReplacer is used to put a gofmt-formatted string for an
+// AST expression onto a single line. The lexer normally inserts a
+// semicolon at each newline, so we can replace newline with semicolon.
+// However, we can't do that in cases where the lexer would not insert
+// a semicolon. We only have to worry about cases that can occur in an
+// expression passed through gofmt, which means composite literals and
+// (due to the printer possibly inserting newlines because of position
+// information) operators.
+var gofmtLineReplacer = strings.NewReplacer(
+	"{\n", "{",
+	",\n", ",",
+	"++\n", "++;",
+	"--\n", "--;",
+	"+\n", "+",
+	"-\n", "-",
+	"*\n", "*",
+	"/\n", "/",
+	"%\n", "%",
+	"&\n", "&",
+	"|\n", "|",
+	"^\n", "^",
+	"<\n", "<",
+	">\n", ">",
+	"=\n", "=",
+	"\n", ";",
+)
+
 // gofmtLine returns the gofmt-formatted string for an AST node,
 // ensuring that it is on a single line.
 func gofmtLine(n interface{}) string {
-	return strings.Replace(gofmt(n), "\n", ";", -1)
+	return gofmtLineReplacer.Replace(gofmt(n))
 }
diff --git a/libgo/go/cmd/cgo/out.go b/libgo/go/cmd/cgo/out.go
index f44da9c..9e6fe6f 100644
--- a/libgo/go/cmd/cgo/out.go
+++ b/libgo/go/cmd/cgo/out.go
@@ -781,6 +781,13 @@ func (p *Package) writeExports(fgo2, fm, fgcc, fgcch io.Writer) {
 	fmt.Fprintf(fgcc, "#include <stdlib.h>\n")
 	fmt.Fprintf(fgcc, "#include \"_cgo_export.h\"\n\n")
 
+	// We use packed structs, but they are always aligned.
+	// The pragmas and address-of-packed-member are not recognized as warning groups in clang 3.4.1, so ignore unknown pragmas first.
+	// remove as part of #27619 (all: drop support for FreeBSD 10).
+	fmt.Fprintf(fgcc, "#pragma GCC diagnostic ignored \"-Wunknown-pragmas\"\n")
+	fmt.Fprintf(fgcc, "#pragma GCC diagnostic ignored \"-Wpragmas\"\n")
+	fmt.Fprintf(fgcc, "#pragma GCC diagnostic ignored \"-Waddress-of-packed-member\"\n")
+
 	fmt.Fprintf(fgcc, "extern void crosscall2(void (*fn)(void *, int, __SIZE_TYPE__), void *, int, __SIZE_TYPE__);\n")
 	fmt.Fprintf(fgcc, "extern __SIZE_TYPE__ _cgo_wait_runtime_init_done();\n")
 	fmt.Fprintf(fgcc, "extern void _cgo_release_context(__SIZE_TYPE__);\n\n")
@@ -1260,7 +1267,7 @@ func determineGccgoManglingScheme() bool {
 	cmd := exec.Command(gccgocmd, "-S", "-o", "-", gofilename)
 	buf, cerr := cmd.CombinedOutput()
 	if cerr != nil {
-		fatalf("%s", err)
+		fatalf("%s", cerr)
 	}
 
 	// New mangling: expect go.l..u00e4ufer.Run
@@ -1478,6 +1485,14 @@ __cgo_size_assert(double, 8)
 
 extern char* _cgo_topofstack(void);
 
+/* We use packed structs, but they are always aligned.  */
+/* The pragmas and address-of-packed-member are not recognized as warning groups in clang 3.4.1, so ignore unknown pragmas first. */
+/* remove as part of #27619 (all: drop support for FreeBSD 10). */
+
+#pragma GCC diagnostic ignored "-Wunknown-pragmas"
+#pragma GCC diagnostic ignored "-Wpragmas"
+#pragma GCC diagnostic ignored "-Waddress-of-packed-member"
+
 #include <errno.h>
 #include <string.h>
 `
diff --git a/libgo/go/cmd/go/alldocs.go b/libgo/go/cmd/go/alldocs.go
index 9d9304a..186f421 100644
--- a/libgo/go/cmd/go/alldocs.go
+++ b/libgo/go/cmd/go/alldocs.go
@@ -442,11 +442,14 @@
 // command alias, described below.
 //
 // To convey to humans and machine tools that code is generated,
-// generated source should have a line early in the file that
-// matches the following regular expression (in Go syntax):
+// generated source should have a line that matches the following
+// regular expression (in Go syntax):
 //
 // 	^// Code generated .* DO NOT EDIT\.$
 //
+// The line may appear anywhere in the file, but is typically
+// placed near the beginning so it is easy to find.
+//
 // Note that go generate does not parse the file, so lines that look
 // like directives in comments or multiline strings will be treated
 // as directives.
@@ -1397,7 +1400,6 @@
 // in the standard user cache directory for the current operating system.
 // Setting the GOCACHE environment variable overrides this default,
 // and running 'go env GOCACHE' prints the current cache directory.
-// You can set the variable to 'off' to disable the cache.
 //
 // The go command periodically deletes cached data that has not been
 // used recently. Running 'go clean -cache' deletes all cached data.
@@ -1596,14 +1598,14 @@
 // line comment. See the go/build package documentation for
 // more details.
 //
-// Non-test Go source files can also include a //go:binary-only-package
-// comment, indicating that the package sources are included
-// for documentation only and must not be used to build the
-// package binary. This enables distribution of Go packages in
-// their compiled form alone. Even binary-only packages require
-// accurate import blocks listing required dependencies, so that
-// those dependencies can be supplied when linking the resulting
-// command.
+// Through the Go 1.12 release, non-test Go source files can also include
+// a //go:binary-only-package comment, indicating that the package
+// sources are included for documentation only and must not be used to
+// build the package binary. This enables distribution of Go packages in
+// their compiled form alone. Even binary-only packages require accurate
+// import blocks listing required dependencies, so that those
+// dependencies can be supplied when linking the resulting command.
+// Note that this feature is scheduled to be removed after the Go 1.12 release.
 //
 //
 // The go.mod file
@@ -2494,7 +2496,8 @@
 // development module, then get will update the required version.
 // Specifying a version earlier than the current required version is valid and
 // downgrades the dependency. The version suffix @none indicates that the
-// dependency should be removed entirely.
+// dependency should be removed entirely, downgrading or removing modules
+// depending on it as needed.
 //
 // Although get defaults to using the latest version of the module containing
 // a named package, it does not use the latest version of that module's
diff --git a/libgo/go/cmd/go/go_test.go b/libgo/go/cmd/go/go_test.go
index 10ff53f..d1166b1 100644
--- a/libgo/go/cmd/go/go_test.go
+++ b/libgo/go/cmd/go/go_test.go
@@ -894,12 +894,54 @@ func (tg *testgoData) failSSH() {
 
 func TestNewReleaseRebuildsStalePackagesInGOPATH(t *testing.T) {
 	if testing.Short() {
-		t.Skip("don't rebuild the standard library in short mode")
+		t.Skip("skipping lengthy test in short mode")
 	}
 
 	tg := testgo(t)
 	defer tg.cleanup()
 
+	// Copy the runtime packages into a temporary GOROOT
+	// so that we can change files.
+	for _, copydir := range []string{
+		"src/runtime",
+		"src/internal/bytealg",
+		"src/internal/cpu",
+		"src/unsafe",
+		filepath.Join("pkg", runtime.GOOS+"_"+runtime.GOARCH),
+		filepath.Join("pkg/tool", runtime.GOOS+"_"+runtime.GOARCH),
+		"pkg/include",
+	} {
+		srcdir := filepath.Join(testGOROOT, copydir)
+		tg.tempDir(filepath.Join("goroot", copydir))
+		err := filepath.Walk(srcdir,
+			func(path string, info os.FileInfo, err error) error {
+				if err != nil {
+					return err
+				}
+				if info.IsDir() {
+					return nil
+				}
+				srcrel, err := filepath.Rel(srcdir, path)
+				if err != nil {
+					return err
+				}
+				dest := filepath.Join("goroot", copydir, srcrel)
+				data, err := ioutil.ReadFile(path)
+				if err != nil {
+					return err
+				}
+				tg.tempFile(dest, string(data))
+				if err := os.Chmod(tg.path(dest), info.Mode()); err != nil {
+					return err
+				}
+				return nil
+			})
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+	tg.setenv("GOROOT", tg.path("goroot"))
+
 	addVar := func(name string, idx int) (restore func()) {
 		data, err := ioutil.ReadFile(name)
 		if err != nil {
@@ -928,7 +970,7 @@ func TestNewReleaseRebuildsStalePackagesInGOPATH(t *testing.T) {
 	// Changing mtime of runtime/internal/sys/sys.go
 	// should have no effect: only the content matters.
 	// In fact this should be true even outside a release branch.
-	sys := runtime.GOROOT() + "/src/runtime/internal/sys/sys.go"
+	sys := tg.path("goroot/src/runtime/internal/sys/sys.go")
 	tg.sleep()
 	restore := addVar(sys, 0)
 	restore()
@@ -943,7 +985,7 @@ func TestNewReleaseRebuildsStalePackagesInGOPATH(t *testing.T) {
 	restore()
 	tg.wantNotStale("p1", "", "./testgo list claims p1 is stale, incorrectly, after changing back to old release")
 	addVar(sys, 2)
-	tg.wantStale("p1", "stale dependency: runtime/internal/sys", "./testgo list claims p1 is NOT stale, incorrectly, after changing sys.go again")
+	tg.wantStale("p1", "stale dependency: runtime", "./testgo list claims p1 is NOT stale, incorrectly, after changing sys.go again")
 	tg.run("install", "-i", "p1")
 	tg.wantNotStale("p1", "", "./testgo list claims p1 is stale after building with new release")
 
@@ -952,9 +994,6 @@ func TestNewReleaseRebuildsStalePackagesInGOPATH(t *testing.T) {
 	tg.wantStale("p1", "stale dependency: runtime/internal/sys", "./testgo list claims p1 is NOT stale, incorrectly, after restoring sys.go")
 	tg.run("install", "-i", "p1")
 	tg.wantNotStale("p1", "", "./testgo list claims p1 is stale after building with old release")
-
-	// Everything is out of date. Rebuild to leave things in a better state.
-	tg.run("install", "std")
 }
 
 func testLocalRun(tg *testgoData, exepath, local, match string) {
diff --git a/libgo/go/cmd/go/internal/clean/clean.go b/libgo/go/cmd/go/internal/clean/clean.go
index 32cc807..27121ed 100644
--- a/libgo/go/cmd/go/internal/clean/clean.go
+++ b/libgo/go/cmd/go/internal/clean/clean.go
@@ -152,7 +152,9 @@ func runClean(cmd *base.Command, args []string) {
 				prev, _ := strconv.ParseInt(strings.TrimSpace(string(buf)), 10, 64)
 				if now > prev {
 					if err = f.Truncate(0); err == nil {
-						_, err = fmt.Fprintf(f, "%d\n", now)
+						if _, err = f.Seek(0, 0); err == nil {
+							_, err = fmt.Fprintf(f, "%d\n", now)
+						}
 					}
 				}
 				if closeErr := f.Close(); err == nil {
diff --git a/libgo/go/cmd/go/internal/generate/generate.go b/libgo/go/cmd/go/internal/generate/generate.go
index 7cbc448..124dbc0 100644
--- a/libgo/go/cmd/go/internal/generate/generate.go
+++ b/libgo/go/cmd/go/internal/generate/generate.go
@@ -49,11 +49,14 @@ that can be run locally. It must either be in the shell path
 command alias, described below.
 
 To convey to humans and machine tools that code is generated,
-generated source should have a line early in the file that
-matches the following regular expression (in Go syntax):
+generated source should have a line that matches the following
+regular expression (in Go syntax):
 
 	^// Code generated .* DO NOT EDIT\.$
 
+The line may appear anywhere in the file, but is typically
+placed near the beginning so it is easy to find.
+
 Note that go generate does not parse the file, so lines that look
 like directives in comments or multiline strings will be treated
 as directives.
diff --git a/libgo/go/cmd/go/internal/help/helpdoc.go b/libgo/go/cmd/go/internal/help/helpdoc.go
index 973bfbc..c219a45 100644
--- a/libgo/go/cmd/go/internal/help/helpdoc.go
+++ b/libgo/go/cmd/go/internal/help/helpdoc.go
@@ -636,14 +636,14 @@ at the first item in the file that is not a blank line or //-style
 line comment. See the go/build package documentation for
 more details.
 
-Non-test Go source files can also include a //go:binary-only-package
-comment, indicating that the package sources are included
-for documentation only and must not be used to build the
-package binary. This enables distribution of Go packages in
-their compiled form alone. Even binary-only packages require
-accurate import blocks listing required dependencies, so that
-those dependencies can be supplied when linking the resulting
-command.
+Through the Go 1.12 release, non-test Go source files can also include
+a //go:binary-only-package comment, indicating that the package
+sources are included for documentation only and must not be used to
+build the package binary. This enables distribution of Go packages in
+their compiled form alone. Even binary-only packages require accurate
+import blocks listing required dependencies, so that those
+dependencies can be supplied when linking the resulting command.
+Note that this feature is scheduled to be removed after the Go 1.12 release.
 	`,
 }
 
@@ -705,7 +705,6 @@ The default location for cache data is a subdirectory named go-build
 in the standard user cache directory for the current operating system.
 Setting the GOCACHE environment variable overrides this default,
 and running 'go env GOCACHE' prints the current cache directory.
-You can set the variable to 'off' to disable the cache.
 
 The go command periodically deletes cached data that has not been
 used recently. Running 'go clean -cache' deletes all cached data.
diff --git a/libgo/go/cmd/go/internal/modcmd/tidy.go b/libgo/go/cmd/go/internal/modcmd/tidy.go
index 839c92a..789e936 100644
--- a/libgo/go/cmd/go/internal/modcmd/tidy.go
+++ b/libgo/go/cmd/go/internal/modcmd/tidy.go
@@ -75,6 +75,7 @@ func modTidyGoSum() {
 	// we only have to tell modfetch what needs keeping.
 	reqs := modload.Reqs()
 	keep := make(map[module.Version]bool)
+	replaced := make(map[module.Version]bool)
 	var walk func(module.Version)
 	walk = func(m module.Version) {
 		// If we build using a replacement module, keep the sum for the replacement,
@@ -87,10 +88,11 @@ func modTidyGoSum() {
 			keep[m] = true
 		} else {
 			keep[r] = true
+			replaced[m] = true
 		}
 		list, _ := reqs.Required(m)
 		for _, r := range list {
-			if !keep[r] {
+			if !keep[r] && !replaced[r] {
 				walk(r)
 			}
 		}
diff --git a/libgo/go/cmd/go/internal/modget/get.go b/libgo/go/cmd/go/internal/modget/get.go
index 2bfe6d3..17a0ed4 100644
--- a/libgo/go/cmd/go/internal/modget/get.go
+++ b/libgo/go/cmd/go/internal/modget/get.go
@@ -56,7 +56,8 @@ If a module under consideration is already a dependency of the current
 development module, then get will update the required version.
 Specifying a version earlier than the current required version is valid and
 downgrades the dependency. The version suffix @none indicates that the
-dependency should be removed entirely.
+dependency should be removed entirely, downgrading or removing modules
+depending on it as needed.
 
 Although get defaults to using the latest version of the module containing
 a named package, it does not use the latest version of that module's
diff --git a/libgo/go/cmd/go/internal/modload/build.go b/libgo/go/cmd/go/internal/modload/build.go
index af89b19..6103545 100644
--- a/libgo/go/cmd/go/internal/modload/build.go
+++ b/libgo/go/cmd/go/internal/modload/build.go
@@ -250,6 +250,16 @@ func findModule(target, path string) module.Version {
 }
 
 func ModInfoProg(info string) []byte {
+	// Inject a variable with the debug information as runtime/debug.modinfo,
+	// but compile it in package main so that it is specific to the binary.
+	//
+	// The variable must be a literal so that it will have the correct value
+	// before the initializer for package main runs.
+	//
+	// We also want the value to be present even if runtime/debug.modinfo is
+	// otherwise unused in the rest of the program. Reading it in an init function
+	// suffices for now.
+
 	return []byte(fmt.Sprintf(`package main
 import _ "unsafe"
 //go:linkname __set_debug_modinfo__ runtime..z2fdebug.setmodinfo
diff --git a/libgo/go/cmd/internal/objabi/funcid.go b/libgo/go/cmd/internal/objabi/funcid.go
index 1792df7..a30bc3f 100644
--- a/libgo/go/cmd/internal/objabi/funcid.go
+++ b/libgo/go/cmd/internal/objabi/funcid.go
@@ -83,7 +83,7 @@ func GetFuncID(name, file string) FuncID {
 	case "runtime.panicwrap":
 		return FuncID_panicwrap
 	}
-	if file == "<autogenerated>" && !strings.HasSuffix(name, ".init") {
+	if file == "<autogenerated>" {
 		return FuncID_wrapper
 	}
 	if strings.HasPrefix(name, "runtime.call") {
diff --git a/libgo/go/crypto/aes/block.go b/libgo/go/crypto/aes/block.go
index 40bd0d3..53308ae 100644
--- a/libgo/go/crypto/aes/block.go
+++ b/libgo/go/crypto/aes/block.go
@@ -31,7 +31,7 @@
 //
 // See FIPS 197 for specification, and see Daemen and Rijmen's Rijndael submission
 // for implementation details.
-//	https://www.csrc.nist.gov/publications/fips/fips197/fips-197.pdf
+//	https://csrc.nist.gov/csrc/media/publications/fips/197/final/documents/fips-197.pdf
 //	https://csrc.nist.gov/archive/aes/rijndael/Rijndael-ammended.pdf
 
 package aes
diff --git a/libgo/go/crypto/elliptic/elliptic.go b/libgo/go/crypto/elliptic/elliptic.go
index 4fc2b5e..c84657c 100644
--- a/libgo/go/crypto/elliptic/elliptic.go
+++ b/libgo/go/crypto/elliptic/elliptic.go
@@ -210,8 +210,9 @@ func (curve *CurveParams) doubleJacobian(x, y, z *big.Int) (*big.Int, *big.Int,
 
 	x3 := new(big.Int).Mul(alpha, alpha)
 	beta8 := new(big.Int).Lsh(beta, 3)
+	beta8.Mod(beta8, curve.P)
 	x3.Sub(x3, beta8)
-	for x3.Sign() == -1 {
+	if x3.Sign() == -1 {
 		x3.Add(x3, curve.P)
 	}
 	x3.Mod(x3, curve.P)
diff --git a/libgo/go/crypto/subtle/constant_time.go b/libgo/go/crypto/subtle/constant_time.go
index 9f5fee8..7c3cf05 100644
--- a/libgo/go/crypto/subtle/constant_time.go
+++ b/libgo/go/crypto/subtle/constant_time.go
@@ -6,9 +6,9 @@
 // code but require careful thought to use correctly.
 package subtle
 
-// ConstantTimeCompare returns 1 if and only if the two slices, x
-// and y, have equal contents. The time taken is a function of the length of
-// the slices and is independent of the contents.
+// ConstantTimeCompare returns 1 if the two slices, x and y, have equal contents
+// and 0 otherwise. The time taken is a function of the length of the slices and
+// is independent of the contents.
 func ConstantTimeCompare(x, y []byte) int {
 	if len(x) != len(y) {
 		return 0
@@ -23,7 +23,7 @@ func ConstantTimeCompare(x, y []byte) int {
 	return ConstantTimeByteEq(v, 0)
 }
 
-// ConstantTimeSelect returns x if v is 1 and y if v is 0.
+// ConstantTimeSelect returns x if v == 1 and y if v == 0.
 // Its behavior is undefined if v takes any other value.
 func ConstantTimeSelect(v, x, y int) int { return ^(v-1)&x | (v-1)&y }
 
diff --git a/libgo/go/crypto/tls/common.go b/libgo/go/crypto/tls/common.go
index 0bc40ccf..f695528 100644
--- a/libgo/go/crypto/tls/common.go
+++ b/libgo/go/crypto/tls/common.go
@@ -16,6 +16,7 @@ import (
 	"io"
 	"math/big"
 	"net"
+	"os"
 	"strings"
 	"sync"
 	"time"
@@ -160,7 +161,7 @@ const (
 )
 
 // supportedSignatureAlgorithms contains the signature and hash algorithms that
-// the code advertises as supported in a TLS 1.2 ClientHello and in a TLS 1.2
+// the code advertises as supported in a TLS 1.2+ ClientHello and in a TLS 1.2+
 // CertificateRequest. The two fields are merged to match with TLS 1.3.
 // Note that in TLS 1.2, the ECDSA algorithms are not constrained to P-256, etc.
 var supportedSignatureAlgorithms = []SignatureScheme{
@@ -177,6 +178,9 @@ var supportedSignatureAlgorithms = []SignatureScheme{
 	ECDSAWithSHA1,
 }
 
+// RSA-PSS is disabled in TLS 1.2 for Go 1.12. See Issue 30055.
+var supportedSignatureAlgorithmsTLS12 = supportedSignatureAlgorithms[3:]
+
 // helloRetryRequestRandom is set as the Random value of a ServerHello
 // to signal that the message is actually a HelloRetryRequest.
 var helloRetryRequestRandom = []byte{ // See RFC 8446, Section 4.1.3.
@@ -199,7 +203,7 @@ type ConnectionState struct {
 	Version                     uint16                // TLS version used by the connection (e.g. VersionTLS12)
 	HandshakeComplete           bool                  // TLS handshake is complete
 	DidResume                   bool                  // connection resumes a previous TLS connection
-	CipherSuite                 uint16                // cipher suite in use (TLS_RSA_WITH_RC4_128_SHA, ...)
+	CipherSuite                 uint16                // cipher suite in use (TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, ...)
 	NegotiatedProtocol          string                // negotiated next protocol (not guaranteed to be from Config.NextProtos)
 	NegotiatedProtocolIsMutual  bool                  // negotiated protocol was advertised by server (client side only)
 	ServerName                  string                // server name requested by client, if any (server side only)
@@ -315,7 +319,7 @@ const (
 // guide certificate selection in the GetCertificate callback.
 type ClientHelloInfo struct {
 	// CipherSuites lists the CipherSuites supported by the client (e.g.
-	// TLS_RSA_WITH_RC4_128_SHA).
+	// TLS_AES_128_GCM_SHA256, TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256).
 	CipherSuites []uint16
 
 	// ServerName indicates the name of the server requested by the client
@@ -521,8 +525,11 @@ type Config struct {
 	// This should be used only for testing.
 	InsecureSkipVerify bool
 
-	// CipherSuites is a list of supported cipher suites. If CipherSuites
-	// is nil, TLS uses a list of suites supported by the implementation.
+	// CipherSuites is a list of supported cipher suites for TLS versions up to
+	// TLS 1.2. If CipherSuites is nil, a default list of secure cipher suites
+	// is used, with a preference order based on hardware performance. The
+	// default cipher suites might change over Go versions. Note that TLS 1.3
+	// ciphersuites are not configurable.
 	CipherSuites []uint16
 
 	// PreferServerCipherSuites controls whether the server selects the
@@ -772,11 +779,53 @@ func (c *Config) supportedVersions(isClient bool) []uint16 {
 		if isClient && v < VersionTLS10 {
 			continue
 		}
+		// TLS 1.3 is opt-in in Go 1.12.
+		if v == VersionTLS13 && !isTLS13Supported() {
+			continue
+		}
 		versions = append(versions, v)
 	}
 	return versions
 }
 
+// tls13Support caches the result for isTLS13Supported.
+var tls13Support struct {
+	sync.Once
+	cached bool
+}
+
+// isTLS13Supported returns whether the program opted into TLS 1.3 via
+// GODEBUG=tls13=1. It's cached after the first execution.
+func isTLS13Supported() bool {
+	tls13Support.Do(func() {
+		tls13Support.cached = goDebugString("tls13") == "1"
+	})
+	return tls13Support.cached
+}
+
+// goDebugString returns the value of the named GODEBUG key.
+// GODEBUG is of the form "key=val,key2=val2".
+func goDebugString(key string) string {
+	s := os.Getenv("GODEBUG")
+	for i := 0; i < len(s)-len(key)-1; i++ {
+		if i > 0 && s[i-1] != ',' {
+			continue
+		}
+		afterKey := s[i+len(key):]
+		if afterKey[0] != '=' || s[i:i+len(key)] != key {
+			continue
+		}
+		val := afterKey[1:]
+		for i, b := range val {
+			if b == ',' {
+				return val[:i]
+			}
+		}
+		return val
+	}
+	return ""
+}
+
 func (c *Config) maxSupportedVersion(isClient bool) uint16 {
 	supportedVersions := c.supportedVersions(isClient)
 	if len(supportedVersions) == 0 {
diff --git a/libgo/go/crypto/tls/conn_test.go b/libgo/go/crypto/tls/conn_test.go
index 76cef71..57f6105 100644
--- a/libgo/go/crypto/tls/conn_test.go
+++ b/libgo/go/crypto/tls/conn_test.go
@@ -142,6 +142,7 @@ func runDynamicRecordSizingTest(t *testing.T, config *Config) {
 
 	handshakeDone := make(chan struct{})
 	recordSizesChan := make(chan []int, 1)
+	defer func() { <-recordSizesChan }() // wait for the goroutine to exit
 	go func() {
 		// This goroutine performs a TLS handshake over clientConn and
 		// then reads TLS records until EOF. It writes a slice that
diff --git a/libgo/go/crypto/tls/handshake_client_test.go b/libgo/go/crypto/tls/handshake_client_test.go
index ececd7b..7441e5b 100644
--- a/libgo/go/crypto/tls/handshake_client_test.go
+++ b/libgo/go/crypto/tls/handshake_client_test.go
@@ -855,6 +855,30 @@ func TestHandshakeClientCertRSAPKCS1v15(t *testing.T) {
 	runClientTestTLS12(t, test)
 }
 
+func TestHandshakeClientCertPSSDisabled(t *testing.T) {
+	config := testConfig.Clone()
+	cert, _ := X509KeyPair([]byte(clientCertificatePEM), []byte(clientKeyPEM))
+	config.Certificates = []Certificate{cert}
+
+	test := &clientTest{
+		name:   "ClientCert-RSA-PSS-Disabled",
+		args:   []string{"-cipher", "AES128", "-Verify", "1"},
+		config: config,
+	}
+
+	// Restore the default signature algorithms, disabling RSA-PSS in TLS 1.2,
+	// and check that handshakes still work.
+	testSupportedSignatureAlgorithmsTLS12 := supportedSignatureAlgorithmsTLS12
+	defer func() { supportedSignatureAlgorithmsTLS12 = testSupportedSignatureAlgorithmsTLS12 }()
+	supportedSignatureAlgorithmsTLS12 = savedSupportedSignatureAlgorithmsTLS12
+
+	// Use t.Run to ensure the defer runs after all parallel tests end.
+	t.Run("", func(t *testing.T) {
+		runClientTestTLS12(t, test)
+		runClientTestTLS13(t, test)
+	})
+}
+
 func TestClientKeyUpdate(t *testing.T) {
 	test := &clientTest{
 		name:          "KeyUpdate",
diff --git a/libgo/go/crypto/tls/handshake_server.go b/libgo/go/crypto/tls/handshake_server.go
index 2745f33..4f4b60a 100644
--- a/libgo/go/crypto/tls/handshake_server.go
+++ b/libgo/go/crypto/tls/handshake_server.go
@@ -463,7 +463,7 @@ func (hs *serverHandshakeState) doFullHandshake() error {
 		}
 		if c.vers >= VersionTLS12 {
 			certReq.hasSignatureAlgorithm = true
-			certReq.supportedSignatureAlgorithms = supportedSignatureAlgorithms
+			certReq.supportedSignatureAlgorithms = supportedSignatureAlgorithmsTLS12
 		}
 
 		// An empty list of certificateAuthorities signals to
@@ -559,7 +559,7 @@ func (hs *serverHandshakeState) doFullHandshake() error {
 		}
 
 		// Determine the signature type.
-		_, sigType, hashFunc, err := pickSignatureAlgorithm(pub, []SignatureScheme{certVerify.signatureAlgorithm}, supportedSignatureAlgorithms, c.vers)
+		_, sigType, hashFunc, err := pickSignatureAlgorithm(pub, []SignatureScheme{certVerify.signatureAlgorithm}, supportedSignatureAlgorithmsTLS12, c.vers)
 		if err != nil {
 			c.sendAlert(alertIllegalParameter)
 			return err
diff --git a/libgo/go/crypto/tls/handshake_server_test.go b/libgo/go/crypto/tls/handshake_server_test.go
index a6240f2..c23f98f 100644
--- a/libgo/go/crypto/tls/handshake_server_test.go
+++ b/libgo/go/crypto/tls/handshake_server_test.go
@@ -1211,6 +1211,33 @@ func TestHandshakeServerRSAPSS(t *testing.T) {
 	runServerTestTLS13(t, test)
 }
 
+func TestHandshakeServerPSSDisabled(t *testing.T) {
+	test := &serverTest{
+		name:    "RSA-PSS-Disabled",
+		command: []string{"openssl", "s_client", "-no_ticket"},
+		wait:    true,
+	}
+
+	// Restore the default signature algorithms, disabling RSA-PSS in TLS 1.2,
+	// and check that handshakes still work.
+	testSupportedSignatureAlgorithmsTLS12 := supportedSignatureAlgorithmsTLS12
+	defer func() { supportedSignatureAlgorithmsTLS12 = testSupportedSignatureAlgorithmsTLS12 }()
+	supportedSignatureAlgorithmsTLS12 = savedSupportedSignatureAlgorithmsTLS12
+
+	runServerTestTLS12(t, test)
+	runServerTestTLS13(t, test)
+
+	test = &serverTest{
+		name:    "RSA-PSS-Disabled-Required",
+		command: []string{"openssl", "s_client", "-no_ticket", "-sigalgs", "rsa_pss_rsae_sha256"},
+		wait:    true,
+
+		expectHandshakeErrorIncluding: "peer doesn't support any common signature algorithms",
+	}
+
+	runServerTestTLS12(t, test)
+}
+
 func benchmarkHandshakeServer(b *testing.B, version uint16, cipherSuite uint16, curve CurveID, cert []byte, key crypto.PrivateKey) {
 	config := testConfig.Clone()
 	config.CipherSuites = []uint16{cipherSuite}
@@ -1390,49 +1417,82 @@ func TestClientAuth(t *testing.T) {
 		defer os.Remove(ecdsaCertPath)
 		ecdsaKeyPath = tempFile(clientECDSAKeyPEM)
 		defer os.Remove(ecdsaKeyPath)
-	} else {
-		t.Parallel()
 	}
 
-	config := testConfig.Clone()
-	config.ClientAuth = RequestClientCert
+	t.Run("Normal", func(t *testing.T) {
+		config := testConfig.Clone()
+		config.ClientAuth = RequestClientCert
 
-	test := &serverTest{
-		name:    "ClientAuthRequestedNotGiven",
-		command: []string{"openssl", "s_client", "-no_ticket", "-cipher", "AES128-SHA"},
-		config:  config,
-	}
-	runServerTestTLS12(t, test)
-	runServerTestTLS13(t, test)
+		test := &serverTest{
+			name:    "ClientAuthRequestedNotGiven",
+			command: []string{"openssl", "s_client", "-no_ticket", "-cipher", "AES128-SHA"},
+			config:  config,
+		}
+		runServerTestTLS12(t, test)
+		runServerTestTLS13(t, test)
 
-	test = &serverTest{
-		name: "ClientAuthRequestedAndGiven",
-		command: []string{"openssl", "s_client", "-no_ticket", "-cipher", "AES128-SHA",
-			"-cert", certPath, "-key", keyPath, "-sigalgs", "rsa_pss_rsae_sha256"},
-		config:            config,
-		expectedPeerCerts: []string{clientCertificatePEM},
-	}
-	runServerTestTLS12(t, test)
-	runServerTestTLS13(t, test)
+		config.ClientAuth = RequireAnyClientCert
 
-	test = &serverTest{
-		name: "ClientAuthRequestedAndECDSAGiven",
-		command: []string{"openssl", "s_client", "-no_ticket", "-cipher", "AES128-SHA",
-			"-cert", ecdsaCertPath, "-key", ecdsaKeyPath},
-		config:            config,
-		expectedPeerCerts: []string{clientECDSACertificatePEM},
-	}
-	runServerTestTLS12(t, test)
-	runServerTestTLS13(t, test)
+		test = &serverTest{
+			name: "ClientAuthRequestedAndGiven",
+			command: []string{"openssl", "s_client", "-no_ticket", "-cipher", "AES128-SHA",
+				"-cert", certPath, "-key", keyPath, "-sigalgs", "rsa_pss_rsae_sha256"},
+			config:            config,
+			expectedPeerCerts: []string{clientCertificatePEM},
+		}
+		runServerTestTLS12(t, test)
+		runServerTestTLS13(t, test)
+
+		test = &serverTest{
+			name: "ClientAuthRequestedAndECDSAGiven",
+			command: []string{"openssl", "s_client", "-no_ticket", "-cipher", "AES128-SHA",
+				"-cert", ecdsaCertPath, "-key", ecdsaKeyPath},
+			config:            config,
+			expectedPeerCerts: []string{clientECDSACertificatePEM},
+		}
+		runServerTestTLS12(t, test)
+		runServerTestTLS13(t, test)
+
+		test = &serverTest{
+			name: "ClientAuthRequestedAndPKCS1v15Given",
+			command: []string{"openssl", "s_client", "-no_ticket", "-cipher", "AES128-SHA",
+				"-cert", certPath, "-key", keyPath, "-sigalgs", "rsa_pkcs1_sha256"},
+			config:            config,
+			expectedPeerCerts: []string{clientCertificatePEM},
+		}
+		runServerTestTLS12(t, test)
+	})
 
-	test = &serverTest{
-		name: "ClientAuthRequestedAndPKCS1v15Given",
-		command: []string{"openssl", "s_client", "-no_ticket", "-cipher", "AES128-SHA",
-			"-cert", certPath, "-key", keyPath, "-sigalgs", "rsa_pkcs1_sha256"},
-		config:            config,
-		expectedPeerCerts: []string{clientCertificatePEM},
-	}
-	runServerTestTLS12(t, test)
+	// Restore the default signature algorithms, disabling RSA-PSS in TLS 1.2,
+	// and check that handshakes still work.
+	testSupportedSignatureAlgorithmsTLS12 := supportedSignatureAlgorithmsTLS12
+	defer func() { supportedSignatureAlgorithmsTLS12 = testSupportedSignatureAlgorithmsTLS12 }()
+	supportedSignatureAlgorithmsTLS12 = savedSupportedSignatureAlgorithmsTLS12
+
+	t.Run("PSSDisabled", func(t *testing.T) {
+		config := testConfig.Clone()
+		config.ClientAuth = RequireAnyClientCert
+
+		test := &serverTest{
+			name: "ClientAuthRequestedAndGiven-PSS-Disabled",
+			command: []string{"openssl", "s_client", "-no_ticket", "-cipher", "AES128-SHA",
+				"-cert", certPath, "-key", keyPath},
+			config:            config,
+			expectedPeerCerts: []string{clientCertificatePEM},
+		}
+		runServerTestTLS12(t, test)
+		runServerTestTLS13(t, test)
+
+		test = &serverTest{
+			name: "ClientAuthRequestedAndGiven-PSS-Disabled-Required",
+			command: []string{"openssl", "s_client", "-no_ticket", "-cipher", "AES128-SHA",
+				"-cert", certPath, "-key", keyPath, "-client_sigalgs", "rsa_pss_rsae_sha256"},
+			config: config,
+
+			expectHandshakeErrorIncluding: "client didn't provide a certificate",
+		}
+		runServerTestTLS12(t, test)
+	})
 }
 
 func TestSNIGivenOnFailure(t *testing.T) {
@@ -1697,3 +1757,58 @@ func TestCloneHash(t *testing.T) {
 		t.Error("cloned hash generated a different sum")
 	}
 }
+
+func TestKeyTooSmallForRSAPSS(t *testing.T) {
+	clientConn, serverConn := localPipe(t)
+	client := Client(clientConn, testConfig)
+	cert, err := X509KeyPair([]byte(`-----BEGIN CERTIFICATE-----
+MIIBcTCCARugAwIBAgIQGjQnkCFlUqaFlt6ixyz/tDANBgkqhkiG9w0BAQsFADAS
+MRAwDgYDVQQKEwdBY21lIENvMB4XDTE5MDExODIzMjMyOFoXDTIwMDExODIzMjMy
+OFowEjEQMA4GA1UEChMHQWNtZSBDbzBcMA0GCSqGSIb3DQEBAQUAA0sAMEgCQQDd
+ez1rFUDwax2HTxbcnFUP9AhcgEGMHVV2nn4VVEWFJB6I8C/Nkx0XyyQlrmFYBzEQ
+nIPhKls4T0hFoLvjJnXpAgMBAAGjTTBLMA4GA1UdDwEB/wQEAwIFoDATBgNVHSUE
+DDAKBggrBgEFBQcDATAMBgNVHRMBAf8EAjAAMBYGA1UdEQQPMA2CC2V4YW1wbGUu
+Y29tMA0GCSqGSIb3DQEBCwUAA0EAxDuUS+BrrS3c+h+k+fQPOmOScy6yTX9mHw0Q
+KbucGamXYEy0URIwOdO0tQ3LHPc1YGvYSPwkDjkjqECs2Vm/AA==
+-----END CERTIFICATE-----`), []byte(`-----BEGIN RSA PRIVATE KEY-----
+MIIBOgIBAAJBAN17PWsVQPBrHYdPFtycVQ/0CFyAQYwdVXaefhVURYUkHojwL82T
+HRfLJCWuYVgHMRCcg+EqWzhPSEWgu+MmdekCAwEAAQJBALjQYNTdXF4CFBbXwUz/
+yt9QFDYT9B5WT/12jeGAe653gtYS6OOi/+eAkGmzg1GlRnw6fOfn+HYNFDORST7z
+4j0CIQDn2xz9hVWQEu9ee3vecNT3f60huDGTNoRhtqgweQGX0wIhAPSLj1VcRZEz
+nKpbtU22+PbIMSJ+e80fmY9LIPx5N4HTAiAthGSimMR9bloz0EY3GyuUEyqoDgMd
+hXxjuno2WesoJQIgemilbcALXpxsLmZLgcQ2KSmaVr7jb5ECx9R+hYKTw1sCIG4s
+T+E0J8wlH24pgwQHzy7Ko2qLwn1b5PW8ecrlvP1g
+-----END RSA PRIVATE KEY-----`))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	done := make(chan struct{})
+	go func() {
+		config := testConfig.Clone()
+		config.Certificates = []Certificate{cert}
+		config.MinVersion = VersionTLS13
+		server := Server(serverConn, config)
+		err := server.Handshake()
+		if !strings.Contains(err.Error(), "key size too small for PSS signature") {
+			t.Errorf(`expected "key size too small for PSS signature", got %q`, err)
+		}
+		close(done)
+	}()
+	err = client.Handshake()
+	if !strings.Contains(err.Error(), "handshake failure") {
+		t.Errorf(`expected "handshake failure", got %q`, err)
+	}
+	<-done
+
+	// With RSA-PSS disabled and TLS 1.2, this should work.
+
+	testSupportedSignatureAlgorithmsTLS12 := supportedSignatureAlgorithmsTLS12
+	defer func() { supportedSignatureAlgorithmsTLS12 = testSupportedSignatureAlgorithmsTLS12 }()
+	supportedSignatureAlgorithmsTLS12 = savedSupportedSignatureAlgorithmsTLS12
+
+	serverConfig := testConfig.Clone()
+	serverConfig.Certificates = []Certificate{cert}
+	serverConfig.MaxVersion = VersionTLS12
+	testHandshake(t, testConfig, serverConfig)
+}
diff --git a/libgo/go/crypto/tls/handshake_server_tls13.go b/libgo/go/crypto/tls/handshake_server_tls13.go
index 5f634b3..fd65ac1 100644
--- a/libgo/go/crypto/tls/handshake_server_tls13.go
+++ b/libgo/go/crypto/tls/handshake_server_tls13.go
@@ -635,7 +635,13 @@ func (hs *serverHandshakeStateTLS13) sendServerCertificate() error {
 	}
 	sig, err := hs.cert.PrivateKey.(crypto.Signer).Sign(c.config.rand(), h.Sum(nil), signOpts)
 	if err != nil {
-		c.sendAlert(alertInternalError)
+		public := hs.cert.PrivateKey.(crypto.Signer).Public()
+		if rsaKey, ok := public.(*rsa.PublicKey); ok && sigType == signatureRSAPSS &&
+			rsaKey.N.BitLen()/8 < sigHash.Size()*2+2 { // key too small for RSA-PSS
+			c.sendAlert(alertHandshakeFailure)
+		} else {
+			c.sendAlert(alertInternalError)
+		}
 		return errors.New("tls: failed to sign handshake: " + err.Error())
 	}
 	certVerifyMsg.signature = sig
diff --git a/libgo/go/crypto/tls/key_agreement.go b/libgo/go/crypto/tls/key_agreement.go
index 628e578..05fe77b 100644
--- a/libgo/go/crypto/tls/key_agreement.go
+++ b/libgo/go/crypto/tls/key_agreement.go
@@ -177,7 +177,7 @@ NextCandidate:
 		return nil, errors.New("tls: certificate private key does not implement crypto.Signer")
 	}
 
-	signatureAlgorithm, sigType, hashFunc, err := pickSignatureAlgorithm(priv.Public(), clientHello.supportedSignatureAlgorithms, supportedSignatureAlgorithms, ka.version)
+	signatureAlgorithm, sigType, hashFunc, err := pickSignatureAlgorithm(priv.Public(), clientHello.supportedSignatureAlgorithms, supportedSignatureAlgorithmsTLS12, ka.version)
 	if err != nil {
 		return nil, err
 	}
diff --git a/libgo/go/crypto/tls/testdata/Client-TLSv12-ClientCert-RSA-PSS-Disabled b/libgo/go/crypto/tls/testdata/Client-TLSv12-ClientCert-RSA-PSS-Disabled
new file mode 100644
index 0000000..9d59cb1
--- /dev/null
+++ b/libgo/go/crypto/tls/testdata/Client-TLSv12-ClientCert-RSA-PSS-Disabled
@@ -0,0 +1,137 @@
+>>> Flow 1 (client to server)
+00000000  16 03 01 00 f8 01 00 00  f4 03 03 00 00 00 00 00  |................|
+00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
+00000020  00 00 00 00 00 00 00 00  00 00 00 20 00 00 00 00  |........... ....|
+00000030  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
+00000040  00 00 00 00 00 00 00 00  00 00 00 00 00 32 cc a8  |.............2..|
+00000050  cc a9 c0 2f c0 2b c0 30  c0 2c c0 27 c0 13 c0 23  |.../.+.0.,.'...#|
+00000060  c0 09 c0 14 c0 0a 00 9c  00 9d 00 3c 00 2f 00 35  |...........<./.5|
+00000070  c0 12 00 0a 00 05 c0 11  c0 07 13 01 13 03 13 02  |................|
+00000080  01 00 00 79 00 05 00 05  01 00 00 00 00 00 0a 00  |...y............|
+00000090  0a 00 08 00 1d 00 17 00  18 00 19 00 0b 00 02 01  |................|
+000000a0  00 00 0d 00 18 00 16 08  04 08 05 08 06 04 01 04  |................|
+000000b0  03 05 01 05 03 06 01 06  03 02 01 02 03 ff 01 00  |................|
+000000c0  01 00 00 12 00 00 00 2b  00 09 08 03 04 03 03 03  |.......+........|
+000000d0  02 03 01 00 33 00 26 00  24 00 1d 00 20 2f e5 7d  |....3.&.$... /.}|
+000000e0  a3 47 cd 62 43 15 28 da  ac 5f bb 29 07 30 ff f6  |.G.bC.(.._.).0..|
+000000f0  84 af c4 cf c2 ed 90 99  5f 58 cb 3b 74           |........_X.;t|
+>>> Flow 2 (server to client)
+00000000  16 03 03 00 59 02 00 00  55 03 03 33 ad 8d f8 90  |....Y...U..3....|
+00000010  d1 72 5d ef e8 94 0f d7  58 15 59 9f 0b f9 ec 73  |.r].....X.Y....s|
+00000020  99 53 f7 03 81 53 1a aa  05 f0 17 20 55 a1 9e 4e  |.S...S..... U..N|
+00000030  98 26 6b b8 d5 bc 2c 3e  ca f6 a0 d9 bb f2 3b dd  |.&k...,>......;.|
+00000040  be 99 f1 35 de 1c f6 51  5b 19 4f 55 c0 2f 00 00  |...5...Q[.OU./..|
+00000050  0d ff 01 00 01 00 00 0b  00 04 03 00 01 02 16 03  |................|
+00000060  03 02 59 0b 00 02 55 00  02 52 00 02 4f 30 82 02  |..Y...U..R..O0..|
+00000070  4b 30 82 01 b4 a0 03 02  01 02 02 09 00 e8 f0 9d  |K0..............|
+00000080  3f e2 5b ea a6 30 0d 06  09 2a 86 48 86 f7 0d 01  |?.[..0...*.H....|
+00000090  01 0b 05 00 30 1f 31 0b  30 09 06 03 55 04 0a 13  |....0.1.0...U...|
+000000a0  02 47 6f 31 10 30 0e 06  03 55 04 03 13 07 47 6f  |.Go1.0...U....Go|
+000000b0  20 52 6f 6f 74 30 1e 17  0d 31 36 30 31 30 31 30  | Root0...1601010|
+000000c0  30 30 30 30 30 5a 17 0d  32 35 30 31 30 31 30 30  |00000Z..25010100|
+000000d0  30 30 30 30 5a 30 1a 31  0b 30 09 06 03 55 04 0a  |0000Z0.1.0...U..|
+000000e0  13 02 47 6f 31 0b 30 09  06 03 55 04 03 13 02 47  |..Go1.0...U....G|
+000000f0  6f 30 81 9f 30 0d 06 09  2a 86 48 86 f7 0d 01 01  |o0..0...*.H.....|
+00000100  01 05 00 03 81 8d 00 30  81 89 02 81 81 00 db 46  |.......0.......F|
+00000110  7d 93 2e 12 27 06 48 bc  06 28 21 ab 7e c4 b6 a2  |}...'.H..(!.~...|
+00000120  5d fe 1e 52 45 88 7a 36  47 a5 08 0d 92 42 5b c2  |]..RE.z6G....B[.|
+00000130  81 c0 be 97 79 98 40 fb  4f 6d 14 fd 2b 13 8b c2  |....y.@.Om..+...|
+00000140  a5 2e 67 d8 d4 09 9e d6  22 38 b7 4a 0b 74 73 2b  |..g....."8.J.ts+|
+00000150  c2 34 f1 d1 93 e5 96 d9  74 7b f3 58 9f 6c 61 3c  |.4......t{.X.la<|
+00000160  c0 b0 41 d4 d9 2b 2b 24  23 77 5b 1c 3b bd 75 5d  |..A..++$#w[.;.u]|
+00000170  ce 20 54 cf a1 63 87 1d  1e 24 c4 f3 1d 1a 50 8b  |. T..c...$....P.|
+00000180  aa b6 14 43 ed 97 a7 75  62 f4 14 c8 52 d7 02 03  |...C...ub...R...|
+00000190  01 00 01 a3 81 93 30 81  90 30 0e 06 03 55 1d 0f  |......0..0...U..|
+000001a0  01 01 ff 04 04 03 02 05  a0 30 1d 06 03 55 1d 25  |.........0...U.%|
+000001b0  04 16 30 14 06 08 2b 06  01 05 05 07 03 01 06 08  |..0...+.........|
+000001c0  2b 06 01 05 05 07 03 02  30 0c 06 03 55 1d 13 01  |+.......0...U...|
+000001d0  01 ff 04 02 30 00 30 19  06 03 55 1d 0e 04 12 04  |....0.0...U.....|
+000001e0  10 9f 91 16 1f 43 43 3e  49 a6 de 6d b6 80 d7 9f  |.....CC>I..m....|
+000001f0  60 30 1b 06 03 55 1d 23  04 14 30 12 80 10 48 13  |`0...U.#..0...H.|
+00000200  49 4d 13 7e 16 31 bb a3  01 d5 ac ab 6e 7b 30 19  |IM.~.1......n{0.|
+00000210  06 03 55 1d 11 04 12 30  10 82 0e 65 78 61 6d 70  |..U....0...examp|
+00000220  6c 65 2e 67 6f 6c 61 6e  67 30 0d 06 09 2a 86 48  |le.golang0...*.H|
+00000230  86 f7 0d 01 01 0b 05 00  03 81 81 00 9d 30 cc 40  |.............0.@|
+00000240  2b 5b 50 a0 61 cb ba e5  53 58 e1 ed 83 28 a9 58  |+[P.a...SX...(.X|
+00000250  1a a9 38 a4 95 a1 ac 31  5a 1a 84 66 3d 43 d3 2d  |..8....1Z..f=C.-|
+00000260  d9 0b f2 97 df d3 20 64  38 92 24 3a 00 bc cf 9c  |...... d8.$:....|
+00000270  7d b7 40 20 01 5f aa d3  16 61 09 a2 76 fd 13 c3  |}.@ ._...a..v...|
+00000280  cc e1 0c 5c ee b1 87 82  f1 6c 04 ed 73 bb b3 43  |...\.....l..s..C|
+00000290  77 8d 0c 1c f1 0f a1 d8  40 83 61 c9 4c 72 2b 9d  |w.......@.a.Lr+.|
+000002a0  ae db 46 06 06 4d f4 c1  b3 3e c0 d1 bd 42 d4 db  |..F..M...>...B..|
+000002b0  fe 3d 13 60 84 5c 21 d3  3b e9 fa e7 16 03 03 00  |.=.`.\!.;.......|
+000002c0  ac 0c 00 00 a8 03 00 1d  20 2d c8 0c d2 27 fc f9  |........ -...'..|
+000002d0  79 71 c4 17 ea 45 ec 0b  dd 66 ce af ec 49 96 7d  |yq...E...f...I.}|
+000002e0  43 ff 88 68 b1 a8 bb e1  38 08 04 00 80 5a ab 5b  |C..h....8....Z.[|
+000002f0  e6 b3 32 e2 98 ae c3 ed  7c f9 90 c4 a4 ea dd 70  |..2.....|......p|
+00000300  fc a4 f8 ef d1 15 0d b7  ad b8 e3 1f 3e c0 e4 40  |............>..@|
+00000310  0d 7b 50 36 8f 88 cb 88  59 7c 20 63 d1 7f 36 9e  |.{P6....Y| c..6.|
+00000320  de a7 cb 6a 49 fd 65 32  36 0b 10 6a df 58 ef fd  |...jI.e26..j.X..|
+00000330  f6 fc e6 65 e7 81 0e 73  25 87 c7 89 dc ec ae 7c  |...e...s%......||
+00000340  e4 81 79 79 a2 b9 12 28  ab 3b d0 2e 5e 81 47 2a  |..yy...(.;..^.G*|
+00000350  79 1e 16 21 fa 64 78 24  33 24 f7 ac f1 11 a7 15  |y..!.dx$3$......|
+00000360  98 f6 24 52 14 7c 1f 28  0c 24 b1 a9 8a 16 03 03  |..$R.|.(.$......|
+00000370  00 3a 0d 00 00 36 03 01  02 40 00 2e 04 03 05 03  |.:...6...@......|
+00000380  06 03 08 07 08 08 08 09  08 0a 08 0b 08 04 08 05  |................|
+00000390  08 06 04 01 05 01 06 01  03 03 02 03 03 01 02 01  |................|
+000003a0  03 02 02 02 04 02 05 02  06 02 00 00 16 03 03 00  |................|
+000003b0  04 0e 00 00 00                                    |.....|
+>>> Flow 3 (client to server)
+00000000  16 03 03 01 fd 0b 00 01  f9 00 01 f6 00 01 f3 30  |...............0|
+00000010  82 01 ef 30 82 01 58 a0  03 02 01 02 02 10 5c 19  |...0..X.......\.|
+00000020  c1 89 65 83 55 6f dc 0b  c9 b9 93 9f e9 bc 30 0d  |..e.Uo........0.|
+00000030  06 09 2a 86 48 86 f7 0d  01 01 0b 05 00 30 12 31  |..*.H........0.1|
+00000040  10 30 0e 06 03 55 04 0a  13 07 41 63 6d 65 20 43  |.0...U....Acme C|
+00000050  6f 30 1e 17 0d 31 36 30  38 31 37 32 31 35 32 33  |o0...16081721523|
+00000060  31 5a 17 0d 31 37 30 38  31 37 32 31 35 32 33 31  |1Z..170817215231|
+00000070  5a 30 12 31 10 30 0e 06  03 55 04 0a 13 07 41 63  |Z0.1.0...U....Ac|
+00000080  6d 65 20 43 6f 30 81 9f  30 0d 06 09 2a 86 48 86  |me Co0..0...*.H.|
+00000090  f7 0d 01 01 01 05 00 03  81 8d 00 30 81 89 02 81  |...........0....|
+000000a0  81 00 ba 6f aa 86 bd cf  bf 9f f2 ef 5c 94 60 78  |...o........\.`x|
+000000b0  6f e8 13 f2 d1 96 6f cd  d9 32 6e 22 37 ce 41 f9  |o.....o..2n"7.A.|
+000000c0  ca 5d 29 ac e1 27 da 61  a2 ee 81 cb 10 c7 df 34  |.])..'.a.......4|
+000000d0  58 95 86 e9 3d 19 e6 5c  27 73 60 c8 8d 78 02 f4  |X...=..\'s`..x..|
+000000e0  1d a4 98 09 a3 19 70 69  3c 25 62 66 2a ab 22 23  |......pi<%bf*."#|
+000000f0  c5 7b 85 38 4f 2e 09 73  32 a7 bd 3e 9b ad ca 84  |.{.8O..s2..>....|
+00000100  07 e6 0f 3a ff 77 c5 9d  41 85 00 8a b6 9b ee b0  |...:.w..A.......|
+00000110  a4 3f 2d 4c 4c e6 42 3e  bb 51 c8 dd 48 54 f4 0c  |.?-LL.B>.Q..HT..|
+00000120  8e 47 02 03 01 00 01 a3  46 30 44 30 0e 06 03 55  |.G......F0D0...U|
+00000130  1d 0f 01 01 ff 04 04 03  02 05 a0 30 13 06 03 55  |...........0...U|
+00000140  1d 25 04 0c 30 0a 06 08  2b 06 01 05 05 07 03 01  |.%..0...+.......|
+00000150  30 0c 06 03 55 1d 13 01  01 ff 04 02 30 00 30 0f  |0...U.......0.0.|
+00000160  06 03 55 1d 11 04 08 30  06 87 04 7f 00 00 01 30  |..U....0.......0|
+00000170  0d 06 09 2a 86 48 86 f7  0d 01 01 0b 05 00 03 81  |...*.H..........|
+00000180  81 00 46 ab 44 a2 fb 28  54 f8 5a 67 f8 62 94 f1  |..F.D..(T.Zg.b..|
+00000190  9a b2 18 9e f2 b1 de 1d  7e 6f 76 95 a9 ba e7 5d  |........~ov....]|
+000001a0  a8 16 6c 9c f7 09 d3 37  e4 4b 2b 36 7c 01 ad 41  |..l....7.K+6|..A|
+000001b0  d2 32 d8 c3 d2 93 f9 10  6b 8e 95 b9 2c 17 8a a3  |.2......k...,...|
+000001c0  44 48 bc 59 13 83 16 04  88 a4 81 5c 25 0d 98 0c  |DH.Y.......\%...|
+000001d0  ac 11 b1 28 56 be 1d cd  61 62 84 09 bf d6 80 c6  |...(V...ab......|
+000001e0  45 8d 82 2c b4 d8 83 9b  db c9 22 b7 2a 12 11 7b  |E..,......".*..{|
+000001f0  fa 02 3b c1 c9 ff ea c9  9d a8 49 d3 95 d7 d5 0e  |..;.......I.....|
+00000200  e5 35 16 03 03 00 25 10  00 00 21 20 2f e5 7d a3  |.5....%...! /.}.|
+00000210  47 cd 62 43 15 28 da ac  5f bb 29 07 30 ff f6 84  |G.bC.(.._.).0...|
+00000220  af c4 cf c2 ed 90 99 5f  58 cb 3b 74 16 03 03 00  |......._X.;t....|
+00000230  88 0f 00 00 84 08 04 00  80 8b ad 4b 9a 7a 53 b8  |...........K.zS.|
+00000240  6a 0a e7 71 6a 9b 8b 89  7d 3a 49 c9 af ce 3f e2  |j..qj...}:I...?.|
+00000250  3e cc 0b da 57 9b 8c 2f  58 0f a9 05 4d e9 de 83  |>...W../X...M...|
+00000260  60 e8 1c 77 ef 23 e4 aa  6b c3 15 64 98 f8 b1 72  |`..w.#..k..d...r|
+00000270  b2 8a 9e a3 19 3d 73 84  05 53 59 e1 bb e1 db 51  |.....=s..SY....Q|
+00000280  49 38 cf 8b ee 3c b6 05  0d ba 62 02 b3 36 dc c1  |I8...<....b..6..|
+00000290  e1 52 4d bd 6a c1 3e 55  ff 82 5f e3 7c 84 1c 65  |.RM.j.>U.._.|..e|
+000002a0  45 53 b9 c0 56 99 ac 56  d7 4a fa 72 3e 63 36 06  |ES..V..V.J.r>c6.|
+000002b0  d3 60 ef 34 05 3f 57 20  79 14 03 03 00 01 01 16  |.`.4.?W y.......|
+000002c0  03 03 00 28 00 00 00 00  00 00 00 00 00 26 b7 73  |...(.........&.s|
+000002d0  b5 e9 b3 8a 63 00 9b 36  a0 cf 2a 60 0f 8a 59 75  |....c..6..*`..Yu|
+000002e0  08 71 97 dc 66 73 15 04  08 b4 d3 91              |.q..fs......|
+>>> Flow 4 (server to client)
+00000000  14 03 03 00 01 01 16 03  03 00 28 d2 b2 3f a8 43  |..........(..?.C|
+00000010  41 1a 85 20 9f ee 21 6a  c5 96 cf 7c 01 8e f6 3a  |A.. ..!j...|...:|
+00000020  e3 29 14 68 ea 74 a3 ef  85 04 78 33 db c7 d4 c9  |.).h.t....x3....|
+00000030  a2 fd 6a                                          |..j|
+>>> Flow 5 (client to server)
+00000000  17 03 03 00 1e 00 00 00  00 00 00 00 01 c3 3b 68  |..............;h|
+00000010  b5 e9 4d 75 22 92 fb 19  85 88 38 97 12 3f ce ca  |..Mu".....8..?..|
+00000020  36 c0 d6 15 03 03 00 1a  00 00 00 00 00 00 00 02  |6...............|
+00000030  c1 a9 03 81 61 04 7c 86  24 e9 90 22 59 6f c7 bc  |....a.|.$.."Yo..|
+00000040  c2 a1                                             |..|
diff --git a/libgo/go/crypto/tls/testdata/Client-TLSv13-ClientCert-RSA-PSS-Disabled b/libgo/go/crypto/tls/testdata/Client-TLSv13-ClientCert-RSA-PSS-Disabled
new file mode 100644
index 0000000..98d718b
--- /dev/null
+++ b/libgo/go/crypto/tls/testdata/Client-TLSv13-ClientCert-RSA-PSS-Disabled
@@ -0,0 +1,138 @@
+>>> Flow 1 (client to server)
+00000000  16 03 01 00 f8 01 00 00  f4 03 03 00 00 00 00 00  |................|
+00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
+00000020  00 00 00 00 00 00 00 00  00 00 00 20 00 00 00 00  |........... ....|
+00000030  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
+00000040  00 00 00 00 00 00 00 00  00 00 00 00 00 32 cc a8  |.............2..|
+00000050  cc a9 c0 2f c0 2b c0 30  c0 2c c0 27 c0 13 c0 23  |.../.+.0.,.'...#|
+00000060  c0 09 c0 14 c0 0a 00 9c  00 9d 00 3c 00 2f 00 35  |...........<./.5|
+00000070  c0 12 00 0a 00 05 c0 11  c0 07 13 01 13 03 13 02  |................|
+00000080  01 00 00 79 00 05 00 05  01 00 00 00 00 00 0a 00  |...y............|
+00000090  0a 00 08 00 1d 00 17 00  18 00 19 00 0b 00 02 01  |................|
+000000a0  00 00 0d 00 18 00 16 08  04 08 05 08 06 04 01 04  |................|
+000000b0  03 05 01 05 03 06 01 06  03 02 01 02 03 ff 01 00  |................|
+000000c0  01 00 00 12 00 00 00 2b  00 09 08 03 04 03 03 03  |.......+........|
+000000d0  02 03 01 00 33 00 26 00  24 00 1d 00 20 2f e5 7d  |....3.&.$... /.}|
+000000e0  a3 47 cd 62 43 15 28 da  ac 5f bb 29 07 30 ff f6  |.G.bC.(.._.).0..|
+000000f0  84 af c4 cf c2 ed 90 99  5f 58 cb 3b 74           |........_X.;t|
+>>> Flow 2 (server to client)
+00000000  16 03 03 00 7a 02 00 00  76 03 03 e5 55 1c 7e bc  |....z...v...U.~.|
+00000010  05 a3 af 8b 02 03 6a 08  34 35 43 9f 35 c1 39 36  |......j.45C.5.96|
+00000020  97 ab d9 4f 77 26 88 31  f8 1c a4 20 00 00 00 00  |...Ow&.1... ....|
+00000030  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
+00000040  00 00 00 00 00 00 00 00  00 00 00 00 13 01 00 00  |................|
+00000050  2e 00 2b 00 02 03 04 00  33 00 24 00 1d 00 20 63  |..+.....3.$... c|
+00000060  74 2f 45 26 f4 7c cd d6  cb 8d 9f b5 6b 88 41 ef  |t/E&.|......k.A.|
+00000070  f4 cd 00 54 91 29 98 e4  a0 6b 6d b5 2f 39 01 14  |...T.)...km./9..|
+00000080  03 03 00 01 01 17 03 03  00 17 e6 81 13 75 85 fe  |.............u..|
+00000090  7d c6 09 24 01 bf 44 78  65 4e 5f d0 37 b9 89 15  |}..$..DxeN_.7...|
+000000a0  98 17 03 03 00 42 88 5c  b3 19 ee 62 c0 2d 95 51  |.....B.\...b.-.Q|
+000000b0  fd 88 e0 13 aa 53 e5 5a  45 be 0f 07 6f 46 c8 1b  |.....S.ZE...oF..|
+000000c0  a2 b5 2a 7c 46 5f b5 90  46 95 b9 a4 ce 44 a8 a7  |..*|F_..F....D..|
+000000d0  3d 8e ce d2 76 57 44 e0  0e 83 af f3 2f 00 55 cb  |=...vWD...../.U.|
+000000e0  1f e7 d2 42 22 6f 78 0c  17 03 03 02 6d 45 f7 95  |...B"ox.....mE..|
+000000f0  68 b9 ad 32 13 34 84 c2  dd 62 a7 f5 18 0f 0b a6  |h..2.4...b......|
+00000100  b8 5c dd 06 69 0d 07 ea  6b ec ad ad a7 13 ea f3  |.\..i...k.......|
+00000110  87 9b 74 a9 53 49 b3 a9  ff f3 eb 71 1b 25 63 8b  |..t.SI.....q.%c.|
+00000120  c6 0f 6a 21 bc f1 fb 4b  8e d4 07 6e c6 8e 9f bf  |..j!...K...n....|
+00000130  73 eb 1e a5 d7 e4 a1 cd  6e 7e de 45 a2 b4 6f 25  |s.......n~.E..o%|
+00000140  fe c2 a1 84 b8 09 d1 65  90 6d ef 07 ea d0 25 01  |.......e.m....%.|
+00000150  54 f2 8e f8 53 38 1e 35  a9 af be 2a 8d 81 9b 77  |T...S8.5...*...w|
+00000160  38 22 42 b8 56 ea 72 ab  c3 ac 9b 17 1a 0b 65 94  |8"B.V.r.......e.|
+00000170  8a 81 6d 83 c6 f4 76 32  ed f7 84 4d ec 17 0e 45  |..m...v2...M...E|
+00000180  74 e8 ba b0 46 92 62 8c  73 07 a8 1f d5 d3 44 d1  |t...F.b.s.....D.|
+00000190  53 21 62 8b 02 c6 20 40  1d f1 75 2b 8a 6a 60 2a  |S!b... @..u+.j`*|
+000001a0  ee 04 5f c0 46 6d 74 7a  18 4a e0 ca d4 a6 6a a2  |.._.Fmtz.J....j.|
+000001b0  11 21 20 4a 3e 57 3c 67  ff 61 3d 15 32 14 f2 01  |.! J>W<g.a=.2...|
+000001c0  a2 cc 96 f6 d1 2d 4f ba  67 ed 02 ae a9 08 13 74  |.....-O.g......t|
+000001d0  33 f6 b5 ad e3 e3 ee 0e  65 f6 89 db 80 d4 f5 23  |3.......e......#|
+000001e0  7b 5d 7a af 5f c6 43 b7  87 f6 90 25 5a f0 f6 76  |{]z._.C....%Z..v|
+000001f0  63 9c 93 d0 f3 94 9c 55  f7 e7 8f 2d cb 83 fb a1  |c......U...-....|
+00000200  b3 db 11 d7 f9 f7 4b 66  50 55 64 31 3f fc 97 df  |......KfPUd1?...|
+00000210  65 f9 e0 eb a2 5e 4d 9d  c7 35 fb 1c 22 79 b1 00  |e....^M..5.."y..|
+00000220  28 e9 54 28 a9 e6 97 e8  33 92 ac 8e f7 c0 82 ac  |(.T(....3.......|
+00000230  99 04 f0 f0 cc e7 4f 04  ad fe dc 9f 25 82 93 12  |......O.....%...|
+00000240  64 4a f6 34 da 41 8a f7  a9 3e fe 24 ae be 40 b7  |dJ.4.A...>.$..@.|
+00000250  10 59 17 11 6f 3c 11 8b  eb b2 42 e7 d5 b7 ee d2  |.Y..o<....B.....|
+00000260  ae 95 9c 21 48 34 d9 5a  20 95 7c 72 35 05 5e 6c  |...!H4.Z .|r5.^l|
+00000270  a2 05 46 30 e6 33 d3 91  ac c8 17 4b b1 15 cc f0  |..F0.3.....K....|
+00000280  af bb 7c 56 e0 5b 25 8e  35 e0 2e 35 91 0d e0 bc  |..|V.[%.5..5....|
+00000290  f6 9c 3b 15 f8 96 dc 4e  6c aa 57 c9 f0 1f 55 e2  |..;....Nl.W...U.|
+000002a0  d9 5d 09 71 f9 af 17 69  29 d5 94 8a 5f fa b2 ad  |.].q...i)..._...|
+000002b0  1b b9 ce 90 e7 bd 02 1b  ad 9d 91 19 7e f3 8f 2d  |............~..-|
+000002c0  70 d5 af 2c e7 29 b1 f9  3c 5a 7f 04 6f 73 88 da  |p..,.)..<Z..os..|
+000002d0  84 bd d7 ad 01 dd 35 b7  1f 64 79 89 ab cb 21 d1  |......5..dy...!.|
+000002e0  20 c5 71 b7 78 fe 93 c0  41 33 d8 aa a2 ed a4 64  | .q.x...A3.....d|
+000002f0  fb 5b c1 6e 0d 1e f7 ca  f6 01 a1 9a fc 82 af 34  |.[.n...........4|
+00000300  e3 45 d8 5a b9 81 e7 e4  c2 26 a7 79 b7 f4 87 9f  |.E.Z.....&.y....|
+00000310  2e 16 ab 96 21 e2 5f 1f  c9 e0 30 3e 97 27 42 15  |....!._...0>.'B.|
+00000320  6f 13 da a1 b2 b1 43 76  69 eb f1 c6 e2 b5 6c 57  |o.....Cvi.....lW|
+00000330  e0 88 c9 0d 7d 37 1b 0b  a0 b7 cd 6b ba 3a 52 55  |....}7.....k.:RU|
+00000340  61 c6 5c 71 ce 1e 69 b9  ea b4 c6 a5 78 c5 b8 b6  |a.\q..i.....x...|
+00000350  4e b1 94 84 a3 d4 31 d9  3b 15 17 03 03 00 99 6c  |N.....1.;......l|
+00000360  5d dd 43 24 9d 6e 5d 64  d3 54 30 aa 98 c3 7e 21  |].C$.n]d.T0...~!|
+00000370  05 06 fc 3b eb 52 12 36  6b 2e e1 32 5a 59 30 a7  |...;.R.6k..2ZY0.|
+00000380  b0 bb 52 1a 36 e6 78 20  84 8c cf 0d 90 da c7 88  |..R.6.x ........|
+00000390  c4 2f bc b4 b6 03 1b 34  9b c8 12 db bc 87 95 d3  |./.....4........|
+000003a0  84 4e 41 c1 de 2f 4c 66  d9 13 fc 78 31 05 6c 67  |.NA../Lf...x1.lg|
+000003b0  e3 3d 28 36 0f fe 5f 45  29 d2 1b 4d a5 60 dc f7  |.=(6.._E)..M.`..|
+000003c0  20 74 cf f5 7b 3f f7 58  53 0c 64 7d 3f c6 f1 ac  | t..{?.XS.d}?...|
+000003d0  a9 1b 60 d8 ea a5 32 11  23 6d 66 19 70 2b fa ce  |..`...2.#mf.p+..|
+000003e0  c8 f6 9d cc 12 83 a1 e1  4b be 98 d3 c2 56 65 34  |........K....Ve4|
+000003f0  73 3a b3 6e d8 2c db 3b  17 03 03 00 35 e6 ce 17  |s:.n.,.;....5...|
+00000400  e5 92 38 9e 00 2d 66 bf  a9 e2 13 66 01 af 64 15  |..8..-f....f..d.|
+00000410  8d da 6b f3 a7 f6 5c 76  e1 f4 c4 2f dc 93 c4 3c  |..k...\v.../...<|
+00000420  69 5a 30 e5 db 5a b5 0b  98 4e 43 a3 51 ba 41 9d  |iZ0..Z...NC.Q.A.|
+00000430  18 c0                                             |..|
+>>> Flow 3 (client to server)
+00000000  14 03 03 00 01 01 17 03  03 02 11 24 0f 0c cc 6a  |...........$...j|
+00000010  8e 07 9c d7 f9 84 55 cc  79 a7 c1 c5 fb 6e 29 5e  |......U.y....n)^|
+00000020  31 e1 b1 00 c0 c9 a8 94  59 75 f4 b5 86 7c a4 8c  |1.......Yu...|..|
+00000030  8d 79 dd 42 45 67 69 f5  fb f0 02 54 f5 8f 1a 86  |.y.BEgi....T....|
+00000040  2f a0 4e 9b 68 e2 69 36  48 cb 8e cc 26 fa 1b 60  |/.N.h.i6H...&..`|
+00000050  c8 f3 b7 7c 36 dd 59 71  a3 f8 9a 7a bc 8a e1 10  |...|6.Yq...z....|
+00000060  8f 6d 69 60 07 b6 62 6d  d3 2b fa a4 81 eb ae 3f  |.mi`..bm.+.....?|
+00000070  9d 7e 1d d7 d1 89 24 4e  7e 65 4b d2 37 58 b2 56  |.~....$N~eK.7X.V|
+00000080  a1 8e 10 73 44 9c f1 c7  60 97 49 99 e2 82 74 58  |...sD...`.I...tX|
+00000090  e3 1f 41 ec 1d 13 85 f1  95 98 39 cb d1 51 f7 0e  |..A.......9..Q..|
+000000a0  fe e4 fa 04 20 1a f2 c5  ae 64 9d eb f8 ff 03 ce  |.... ....d......|
+000000b0  ca 12 7c dd a6 b4 2c a3  eb 8e 83 2c cf 77 6b 82  |..|...,....,.wk.|
+000000c0  68 77 58 5d 3e ef 01 0b  78 e9 37 b0 36 9c 62 44  |hwX]>...x.7.6.bD|
+000000d0  88 ae f1 5a d7 93 81 0a  84 cf 4f 3b db 05 41 92  |...Z......O;..A.|
+000000e0  4d 31 3d 06 9e 73 11 43  de 3e ec b8 b0 48 99 84  |M1=..s.C.>...H..|
+000000f0  bc 0c 7c 86 93 03 d5 5f  c5 21 34 a5 cc c7 d5 42  |..|...._.!4....B|
+00000100  1d 69 94 53 39 d9 56 07  40 46 44 89 e6 95 8d e9  |.i.S9.V.@FD.....|
+00000110  ca 6d f0 e0 2a 22 70 bc  e7 7f 8e 15 0c 56 51 e3  |.m..*"p......VQ.|
+00000120  46 5c b9 66 c5 8b 07 d3  f0 bb 84 fe 71 d6 a2 90  |F\.f........q...|
+00000130  d9 ec 46 00 82 10 38 9c  8f 35 e5 48 d8 82 7f 65  |..F...8..5.H...e|
+00000140  68 f5 42 48 74 6b 29 79  f3 32 b6 a1 aa 42 73 e3  |h.BHtk)y.2...Bs.|
+00000150  c3 f6 fc 76 9e 32 59 26  a6 75 4a dc 65 23 73 10  |...v.2Y&.uJ.e#s.|
+00000160  35 79 a5 41 7b 72 d5 cd  33 1f 7d 98 b3 39 4b f6  |5y.A{r..3.}..9K.|
+00000170  e8 09 ed d6 62 a0 48 b5  76 47 2e 7e 1a 5d 75 6d  |....b.H.vG.~.]um|
+00000180  c2 98 22 17 b1 8f 2e a5  a2 b3 b3 5e d9 89 c5 a0  |.."........^....|
+00000190  46 2a ac af 20 66 e9 f3  02 84 26 51 c0 0a 2e 0c  |F*.. f....&Q....|
+000001a0  d3 90 3c 9f 19 3f 25 3e  7d 3a 38 6f f3 ce 2f c4  |..<..?%>}:8o../.|
+000001b0  7b 84 e4 d5 c2 c8 90 54  6d 2c 59 70 34 44 53 25  |{......Tm,Yp4DS%|
+000001c0  ee ee d6 7e 13 30 1e 09  ff f2 79 bd 7c a1 af a9  |...~.0....y.|...|
+000001d0  a9 7b 51 6a d8 17 41 22  f5 d0 5d 84 00 a7 5f 1a  |.{Qj..A"..]..._.|
+000001e0  b6 15 98 de f4 bd cd fe  70 38 5c 0f 44 60 5a 7d  |........p8\.D`Z}|
+000001f0  be df 6e 56 bb 83 0b 10  fa 5d 3a 2c 9e 4a 00 7f  |..nV.....]:,.J..|
+00000200  ec f4 42 52 52 95 5e e1  bd cc cf a0 45 c2 79 2c  |..BRR.^.....E.y,|
+00000210  10 4d 14 35 ad bd 18 d4  b1 aa 09 65 17 03 03 00  |.M.5.......e....|
+00000220  99 a4 2c 7a c2 25 ba 3b  a2 84 1f e8 a0 d1 5c c4  |..,z.%.;......\.|
+00000230  bb c6 f8 fc eb 19 3e f5  e6 53 9f c3 35 d3 7a 00  |......>..S..5.z.|
+00000240  68 e1 e0 2f 73 75 d7 2d  df 44 aa 34 43 bf 66 c1  |h../su.-.D.4C.f.|
+00000250  31 0d e6 86 f8 71 6b 71  ac 89 c5 26 cf d9 1e 43  |1....qkq...&...C|
+00000260  33 c3 48 68 e0 4d f5 d5  69 ff fc 02 47 cc 91 41  |3.Hh.M..i...G..A|
+00000270  83 41 58 04 2a 02 53 3c  3b 0a 4c 18 16 00 fd e8  |.AX.*.S<;.L.....|
+00000280  64 54 0d 34 a1 3d a5 4b  bd c2 54 17 c3 5a 82 7a  |dT.4.=.K..T..Z.z|
+00000290  55 5d a9 57 63 62 ef 8b  3a 75 f2 cd 34 ef d6 30  |U].Wcb..:u..4..0|
+000002a0  08 7f 03 0b c3 eb 29 94  88 11 38 42 40 6f bf cc  |......)...8B@o..|
+000002b0  d4 01 3f 8a 90 11 f9 da  fd 9e 17 03 03 00 35 7d  |..?...........5}|
+000002c0  2d 12 d7 58 d0 76 43 25  d1 8d 5c 5c b1 7f fa 48  |-..X.vC%..\\...H|
+000002d0  a9 21 48 02 64 76 91 6c  79 7e b9 22 33 f7 32 cb  |.!H.dv.ly~."3.2.|
+000002e0  50 22 78 02 96 4e 2d f6  09 68 06 8e 44 e6 fd 7f  |P"x..N-..h..D...|
+000002f0  cf 0a 7e a3 17 03 03 00  17 84 cd d8 f2 e2 38 2e  |..~...........8.|
+00000300  57 e5 47 76 48 50 34 9e  65 d4 c6 1d 7d b3 4e 91  |W.GvHP4.e...}.N.|
+00000310  17 03 03 00 13 e5 05 98  5b 87 5d db ae 89 38 2c  |........[.]...8,|
+00000320  35 89 31 14 73 cd 16 54                           |5.1.s..T|
diff --git a/libgo/go/crypto/tls/testdata/Server-TLSv12-ClientAuthRequestedAndGiven-PSS-Disabled b/libgo/go/crypto/tls/testdata/Server-TLSv12-ClientAuthRequestedAndGiven-PSS-Disabled
new file mode 100644
index 0000000..cb626a1
--- /dev/null
+++ b/libgo/go/crypto/tls/testdata/Server-TLSv12-ClientAuthRequestedAndGiven-PSS-Disabled
@@ -0,0 +1,126 @@
+>>> Flow 1 (client to server)
+00000000  16 03 01 00 97 01 00 00  93 03 03 9e b1 2a 26 04  |.............*&.|
+00000010  8d 66 df 43 cb 0a 85 80  4f f2 99 7d 80 20 64 7e  |.f.C....O..}. d~|
+00000020  30 a0 bb 60 ac 0e d4 ce  f0 ae 98 00 00 04 00 2f  |0..`.........../|
+00000030  00 ff 01 00 00 66 00 00  00 0e 00 0c 00 00 09 31  |.....f.........1|
+00000040  32 37 2e 30 2e 30 2e 31  00 0b 00 04 03 00 01 02  |27.0.0.1........|
+00000050  00 0a 00 0c 00 0a 00 1d  00 17 00 1e 00 19 00 18  |................|
+00000060  00 16 00 00 00 17 00 00  00 0d 00 30 00 2e 04 03  |...........0....|
+00000070  05 03 06 03 08 07 08 08  08 09 08 0a 08 0b 08 04  |................|
+00000080  08 05 08 06 04 01 05 01  06 01 03 03 02 03 03 01  |................|
+00000090  02 01 03 02 02 02 04 02  05 02 06 02              |............|
+>>> Flow 2 (server to client)
+00000000  16 03 03 00 31 02 00 00  2d 03 03 00 00 00 00 00  |....1...-.......|
+00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
+00000020  00 00 00 44 4f 57 4e 47  52 44 01 00 00 2f 00 00  |...DOWNGRD.../..|
+00000030  05 ff 01 00 01 00 16 03  03 02 59 0b 00 02 55 00  |..........Y...U.|
+00000040  02 52 00 02 4f 30 82 02  4b 30 82 01 b4 a0 03 02  |.R..O0..K0......|
+00000050  01 02 02 09 00 e8 f0 9d  3f e2 5b ea a6 30 0d 06  |........?.[..0..|
+00000060  09 2a 86 48 86 f7 0d 01  01 0b 05 00 30 1f 31 0b  |.*.H........0.1.|
+00000070  30 09 06 03 55 04 0a 13  02 47 6f 31 10 30 0e 06  |0...U....Go1.0..|
+00000080  03 55 04 03 13 07 47 6f  20 52 6f 6f 74 30 1e 17  |.U....Go Root0..|
+00000090  0d 31 36 30 31 30 31 30  30 30 30 30 30 5a 17 0d  |.160101000000Z..|
+000000a0  32 35 30 31 30 31 30 30  30 30 30 30 5a 30 1a 31  |250101000000Z0.1|
+000000b0  0b 30 09 06 03 55 04 0a  13 02 47 6f 31 0b 30 09  |.0...U....Go1.0.|
+000000c0  06 03 55 04 03 13 02 47  6f 30 81 9f 30 0d 06 09  |..U....Go0..0...|
+000000d0  2a 86 48 86 f7 0d 01 01  01 05 00 03 81 8d 00 30  |*.H............0|
+000000e0  81 89 02 81 81 00 db 46  7d 93 2e 12 27 06 48 bc  |.......F}...'.H.|
+000000f0  06 28 21 ab 7e c4 b6 a2  5d fe 1e 52 45 88 7a 36  |.(!.~...]..RE.z6|
+00000100  47 a5 08 0d 92 42 5b c2  81 c0 be 97 79 98 40 fb  |G....B[.....y.@.|
+00000110  4f 6d 14 fd 2b 13 8b c2  a5 2e 67 d8 d4 09 9e d6  |Om..+.....g.....|
+00000120  22 38 b7 4a 0b 74 73 2b  c2 34 f1 d1 93 e5 96 d9  |"8.J.ts+.4......|
+00000130  74 7b f3 58 9f 6c 61 3c  c0 b0 41 d4 d9 2b 2b 24  |t{.X.la<..A..++$|
+00000140  23 77 5b 1c 3b bd 75 5d  ce 20 54 cf a1 63 87 1d  |#w[.;.u]. T..c..|
+00000150  1e 24 c4 f3 1d 1a 50 8b  aa b6 14 43 ed 97 a7 75  |.$....P....C...u|
+00000160  62 f4 14 c8 52 d7 02 03  01 00 01 a3 81 93 30 81  |b...R.........0.|
+00000170  90 30 0e 06 03 55 1d 0f  01 01 ff 04 04 03 02 05  |.0...U..........|
+00000180  a0 30 1d 06 03 55 1d 25  04 16 30 14 06 08 2b 06  |.0...U.%..0...+.|
+00000190  01 05 05 07 03 01 06 08  2b 06 01 05 05 07 03 02  |........+.......|
+000001a0  30 0c 06 03 55 1d 13 01  01 ff 04 02 30 00 30 19  |0...U.......0.0.|
+000001b0  06 03 55 1d 0e 04 12 04  10 9f 91 16 1f 43 43 3e  |..U..........CC>|
+000001c0  49 a6 de 6d b6 80 d7 9f  60 30 1b 06 03 55 1d 23  |I..m....`0...U.#|
+000001d0  04 14 30 12 80 10 48 13  49 4d 13 7e 16 31 bb a3  |..0...H.IM.~.1..|
+000001e0  01 d5 ac ab 6e 7b 30 19  06 03 55 1d 11 04 12 30  |....n{0...U....0|
+000001f0  10 82 0e 65 78 61 6d 70  6c 65 2e 67 6f 6c 61 6e  |...example.golan|
+00000200  67 30 0d 06 09 2a 86 48  86 f7 0d 01 01 0b 05 00  |g0...*.H........|
+00000210  03 81 81 00 9d 30 cc 40  2b 5b 50 a0 61 cb ba e5  |.....0.@+[P.a...|
+00000220  53 58 e1 ed 83 28 a9 58  1a a9 38 a4 95 a1 ac 31  |SX...(.X..8....1|
+00000230  5a 1a 84 66 3d 43 d3 2d  d9 0b f2 97 df d3 20 64  |Z..f=C.-...... d|
+00000240  38 92 24 3a 00 bc cf 9c  7d b7 40 20 01 5f aa d3  |8.$:....}.@ ._..|
+00000250  16 61 09 a2 76 fd 13 c3  cc e1 0c 5c ee b1 87 82  |.a..v......\....|
+00000260  f1 6c 04 ed 73 bb b3 43  77 8d 0c 1c f1 0f a1 d8  |.l..s..Cw.......|
+00000270  40 83 61 c9 4c 72 2b 9d  ae db 46 06 06 4d f4 c1  |@.a.Lr+...F..M..|
+00000280  b3 3e c0 d1 bd 42 d4 db  fe 3d 13 60 84 5c 21 d3  |.>...B...=.`.\!.|
+00000290  3b e9 fa e7 16 03 03 00  1b 0d 00 00 17 02 01 40  |;..............@|
+000002a0  00 10 04 01 04 03 05 01  05 03 06 01 06 03 02 01  |................|
+000002b0  02 03 00 00 16 03 03 00  04 0e 00 00 00           |.............|
+>>> Flow 3 (client to server)
+00000000  16 03 03 01 fd 0b 00 01  f9 00 01 f6 00 01 f3 30  |...............0|
+00000010  82 01 ef 30 82 01 58 a0  03 02 01 02 02 10 5c 19  |...0..X.......\.|
+00000020  c1 89 65 83 55 6f dc 0b  c9 b9 93 9f e9 bc 30 0d  |..e.Uo........0.|
+00000030  06 09 2a 86 48 86 f7 0d  01 01 0b 05 00 30 12 31  |..*.H........0.1|
+00000040  10 30 0e 06 03 55 04 0a  13 07 41 63 6d 65 20 43  |.0...U....Acme C|
+00000050  6f 30 1e 17 0d 31 36 30  38 31 37 32 31 35 32 33  |o0...16081721523|
+00000060  31 5a 17 0d 31 37 30 38  31 37 32 31 35 32 33 31  |1Z..170817215231|
+00000070  5a 30 12 31 10 30 0e 06  03 55 04 0a 13 07 41 63  |Z0.1.0...U....Ac|
+00000080  6d 65 20 43 6f 30 81 9f  30 0d 06 09 2a 86 48 86  |me Co0..0...*.H.|
+00000090  f7 0d 01 01 01 05 00 03  81 8d 00 30 81 89 02 81  |...........0....|
+000000a0  81 00 ba 6f aa 86 bd cf  bf 9f f2 ef 5c 94 60 78  |...o........\.`x|
+000000b0  6f e8 13 f2 d1 96 6f cd  d9 32 6e 22 37 ce 41 f9  |o.....o..2n"7.A.|
+000000c0  ca 5d 29 ac e1 27 da 61  a2 ee 81 cb 10 c7 df 34  |.])..'.a.......4|
+000000d0  58 95 86 e9 3d 19 e6 5c  27 73 60 c8 8d 78 02 f4  |X...=..\'s`..x..|
+000000e0  1d a4 98 09 a3 19 70 69  3c 25 62 66 2a ab 22 23  |......pi<%bf*."#|
+000000f0  c5 7b 85 38 4f 2e 09 73  32 a7 bd 3e 9b ad ca 84  |.{.8O..s2..>....|
+00000100  07 e6 0f 3a ff 77 c5 9d  41 85 00 8a b6 9b ee b0  |...:.w..A.......|
+00000110  a4 3f 2d 4c 4c e6 42 3e  bb 51 c8 dd 48 54 f4 0c  |.?-LL.B>.Q..HT..|
+00000120  8e 47 02 03 01 00 01 a3  46 30 44 30 0e 06 03 55  |.G......F0D0...U|
+00000130  1d 0f 01 01 ff 04 04 03  02 05 a0 30 13 06 03 55  |...........0...U|
+00000140  1d 25 04 0c 30 0a 06 08  2b 06 01 05 05 07 03 01  |.%..0...+.......|
+00000150  30 0c 06 03 55 1d 13 01  01 ff 04 02 30 00 30 0f  |0...U.......0.0.|
+00000160  06 03 55 1d 11 04 08 30  06 87 04 7f 00 00 01 30  |..U....0.......0|
+00000170  0d 06 09 2a 86 48 86 f7  0d 01 01 0b 05 00 03 81  |...*.H..........|
+00000180  81 00 46 ab 44 a2 fb 28  54 f8 5a 67 f8 62 94 f1  |..F.D..(T.Zg.b..|
+00000190  9a b2 18 9e f2 b1 de 1d  7e 6f 76 95 a9 ba e7 5d  |........~ov....]|
+000001a0  a8 16 6c 9c f7 09 d3 37  e4 4b 2b 36 7c 01 ad 41  |..l....7.K+6|..A|
+000001b0  d2 32 d8 c3 d2 93 f9 10  6b 8e 95 b9 2c 17 8a a3  |.2......k...,...|
+000001c0  44 48 bc 59 13 83 16 04  88 a4 81 5c 25 0d 98 0c  |DH.Y.......\%...|
+000001d0  ac 11 b1 28 56 be 1d cd  61 62 84 09 bf d6 80 c6  |...(V...ab......|
+000001e0  45 8d 82 2c b4 d8 83 9b  db c9 22 b7 2a 12 11 7b  |E..,......".*..{|
+000001f0  fa 02 3b c1 c9 ff ea c9  9d a8 49 d3 95 d7 d5 0e  |..;.......I.....|
+00000200  e5 35 16 03 03 00 86 10  00 00 82 00 80 3f 1b ee  |.5...........?..|
+00000210  02 ec a5 9f 6e 38 69 2c  b7 03 89 65 b4 92 79 a0  |....n8i,...e..y.|
+00000220  b2 0b ab 9b 44 9c 68 d1  8e 5c 40 9c b5 1c a5 70  |....D.h..\@....p|
+00000230  00 a2 2e fb 98 b7 45 7b  9c 63 46 68 1d 55 9e 01  |......E{.cFh.U..|
+00000240  7f 84 31 62 07 c4 2f 20  5f 1a 94 8c 1f f4 3a 6d  |..1b../ _.....:m|
+00000250  a8 2b b8 08 5b ec 27 e3  49 9e 51 b3 66 98 09 ba  |.+..[.'.I.Q.f...|
+00000260  64 65 c8 3c 11 fb 14 4a  c9 ea 3c 5e 52 10 a0 0b  |de.<...J..<^R...|
+00000270  a9 fc 10 13 c9 99 0c a0  8b b4 40 66 0e 11 5e 1d  |..........@f..^.|
+00000280  8b 45 5c 4d 0d 39 39 f6  0c 59 8f 06 99 16 03 03  |.E\M.99..Y......|
+00000290  00 88 0f 00 00 84 04 01  00 80 71 1c 9c fd b2 c9  |..........q.....|
+000002a0  b9 7f f3 51 e2 63 96 08  56 d2 bd 19 61 9f 3f be  |...Q.c..V...a.?.|
+000002b0  e5 4c 22 a8 3f 81 98 2d  67 56 4e 2d 61 6e 51 e5  |.L".?..-gVN-anQ.|
+000002c0  11 24 bd 1b 38 ba dc 8c  76 51 1d 3c 6e 81 50 9a  |.$..8...vQ.<n.P.|
+000002d0  b5 24 9c d8 af f7 80 8a  51 43 ec b3 59 18 bd ea  |.$......QC..Y...|
+000002e0  8a be af 11 c8 ac 60 88  e3 67 a2 ae c2 95 16 47  |......`..g.....G|
+000002f0  2b e2 ea 42 0a 0a 3f 2b  8b c8 ec 9d e7 b2 a6 ee  |+..B..?+........|
+00000300  f4 9b ba 28 47 e2 30 ae  05 89 09 65 3d b6 54 8a  |...(G.0....e=.T.|
+00000310  4a df d4 fa a5 4c 30 38  53 f2 14 03 03 00 01 01  |J....L08S.......|
+00000320  16 03 03 00 40 97 50 23  88 56 0d d4 1b ba 6f 3e  |....@.P#.V....o>|
+00000330  8d 82 6c f3 04 55 2c 13  d9 5b 0a 73 88 4f 8b 3c  |..l..U,..[.s.O.<|
+00000340  cd ef 1a a7 15 7c 33 bb  ff fa 01 c4 87 d7 df 47  |.....|3........G|
+00000350  37 b6 fe 1d e6 82 c2 8a  33 b1 c9 ae 85 45 c8 0d  |7.......3....E..|
+00000360  38 47 69 2d 54                                    |8Gi-T|
+>>> Flow 4 (server to client)
+00000000  14 03 03 00 01 01 16 03  03 00 40 00 00 00 00 00  |..........@.....|
+00000010  00 00 00 00 00 00 00 00  00 00 00 20 98 12 44 63  |........... ..Dc|
+00000020  e7 77 e6 e8 c0 c7 d7 b6  f7 c4 4e 13 e3 79 af 33  |.w........N..y.3|
+00000030  3b 6c 86 22 c5 9e dd 25  74 e5 7b 37 fb 24 c6 48  |;l."...%t.{7.$.H|
+00000040  c9 74 a7 9b 9b 32 a7 c1  b9 bb e0 17 03 03 00 40  |.t...2.........@|
+00000050  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
+00000060  80 d7 ec 51 cf ae d4 1a  af 11 59 d1 0c 62 a6 67  |...Q......Y..b.g|
+00000070  2e 6f 18 23 29 75 92 07  b1 16 09 8f 2d f8 04 fe  |.o.#)u......-...|
+00000080  ce 71 2c b6 00 fd 7b 53  cb 6d 97 06 06 e6 af f4  |.q,...{S.m......|
+00000090  15 03 03 00 30 00 00 00  00 00 00 00 00 00 00 00  |....0...........|
+000000a0  00 00 00 00 00 73 14 3a  87 3b ca 3a 2b b2 52 30  |.....s.:.;.:+.R0|
+000000b0  98 62 88 1b a7 58 66 47  66 72 fd bb b6 b7 6b 99  |.b...XfGfr....k.|
+000000c0  20 ab e9 22 62                                    | .."b|
diff --git a/libgo/go/crypto/tls/testdata/Server-TLSv12-ClientAuthRequestedAndGiven-PSS-Disabled-Required b/libgo/go/crypto/tls/testdata/Server-TLSv12-ClientAuthRequestedAndGiven-PSS-Disabled-Required
new file mode 100644
index 0000000..86d5415
--- /dev/null
+++ b/libgo/go/crypto/tls/testdata/Server-TLSv12-ClientAuthRequestedAndGiven-PSS-Disabled-Required
@@ -0,0 +1,74 @@
+>>> Flow 1 (client to server)
+00000000  16 03 01 00 97 01 00 00  93 03 03 d7 9c de f8 62  |...............b|
+00000010  7e 32 5b bc d5 12 35 89  42 37 be ca 55 74 24 61  |~2[...5.B7..Ut$a|
+00000020  c0 50 91 0f 1b 42 29 9f  c1 6a cb 00 00 04 00 2f  |.P...B)..j...../|
+00000030  00 ff 01 00 00 66 00 00  00 0e 00 0c 00 00 09 31  |.....f.........1|
+00000040  32 37 2e 30 2e 30 2e 31  00 0b 00 04 03 00 01 02  |27.0.0.1........|
+00000050  00 0a 00 0c 00 0a 00 1d  00 17 00 1e 00 19 00 18  |................|
+00000060  00 16 00 00 00 17 00 00  00 0d 00 30 00 2e 04 03  |...........0....|
+00000070  05 03 06 03 08 07 08 08  08 09 08 0a 08 0b 08 04  |................|
+00000080  08 05 08 06 04 01 05 01  06 01 03 03 02 03 03 01  |................|
+00000090  02 01 03 02 02 02 04 02  05 02 06 02              |............|
+>>> Flow 2 (server to client)
+00000000  16 03 03 00 31 02 00 00  2d 03 03 00 00 00 00 00  |....1...-.......|
+00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
+00000020  00 00 00 44 4f 57 4e 47  52 44 01 00 00 2f 00 00  |...DOWNGRD.../..|
+00000030  05 ff 01 00 01 00 16 03  03 02 59 0b 00 02 55 00  |..........Y...U.|
+00000040  02 52 00 02 4f 30 82 02  4b 30 82 01 b4 a0 03 02  |.R..O0..K0......|
+00000050  01 02 02 09 00 e8 f0 9d  3f e2 5b ea a6 30 0d 06  |........?.[..0..|
+00000060  09 2a 86 48 86 f7 0d 01  01 0b 05 00 30 1f 31 0b  |.*.H........0.1.|
+00000070  30 09 06 03 55 04 0a 13  02 47 6f 31 10 30 0e 06  |0...U....Go1.0..|
+00000080  03 55 04 03 13 07 47 6f  20 52 6f 6f 74 30 1e 17  |.U....Go Root0..|
+00000090  0d 31 36 30 31 30 31 30  30 30 30 30 30 5a 17 0d  |.160101000000Z..|
+000000a0  32 35 30 31 30 31 30 30  30 30 30 30 5a 30 1a 31  |250101000000Z0.1|
+000000b0  0b 30 09 06 03 55 04 0a  13 02 47 6f 31 0b 30 09  |.0...U....Go1.0.|
+000000c0  06 03 55 04 03 13 02 47  6f 30 81 9f 30 0d 06 09  |..U....Go0..0...|
+000000d0  2a 86 48 86 f7 0d 01 01  01 05 00 03 81 8d 00 30  |*.H............0|
+000000e0  81 89 02 81 81 00 db 46  7d 93 2e 12 27 06 48 bc  |.......F}...'.H.|
+000000f0  06 28 21 ab 7e c4 b6 a2  5d fe 1e 52 45 88 7a 36  |.(!.~...]..RE.z6|
+00000100  47 a5 08 0d 92 42 5b c2  81 c0 be 97 79 98 40 fb  |G....B[.....y.@.|
+00000110  4f 6d 14 fd 2b 13 8b c2  a5 2e 67 d8 d4 09 9e d6  |Om..+.....g.....|
+00000120  22 38 b7 4a 0b 74 73 2b  c2 34 f1 d1 93 e5 96 d9  |"8.J.ts+.4......|
+00000130  74 7b f3 58 9f 6c 61 3c  c0 b0 41 d4 d9 2b 2b 24  |t{.X.la<..A..++$|
+00000140  23 77 5b 1c 3b bd 75 5d  ce 20 54 cf a1 63 87 1d  |#w[.;.u]. T..c..|
+00000150  1e 24 c4 f3 1d 1a 50 8b  aa b6 14 43 ed 97 a7 75  |.$....P....C...u|
+00000160  62 f4 14 c8 52 d7 02 03  01 00 01 a3 81 93 30 81  |b...R.........0.|
+00000170  90 30 0e 06 03 55 1d 0f  01 01 ff 04 04 03 02 05  |.0...U..........|
+00000180  a0 30 1d 06 03 55 1d 25  04 16 30 14 06 08 2b 06  |.0...U.%..0...+.|
+00000190  01 05 05 07 03 01 06 08  2b 06 01 05 05 07 03 02  |........+.......|
+000001a0  30 0c 06 03 55 1d 13 01  01 ff 04 02 30 00 30 19  |0...U.......0.0.|
+000001b0  06 03 55 1d 0e 04 12 04  10 9f 91 16 1f 43 43 3e  |..U..........CC>|
+000001c0  49 a6 de 6d b6 80 d7 9f  60 30 1b 06 03 55 1d 23  |I..m....`0...U.#|
+000001d0  04 14 30 12 80 10 48 13  49 4d 13 7e 16 31 bb a3  |..0...H.IM.~.1..|
+000001e0  01 d5 ac ab 6e 7b 30 19  06 03 55 1d 11 04 12 30  |....n{0...U....0|
+000001f0  10 82 0e 65 78 61 6d 70  6c 65 2e 67 6f 6c 61 6e  |...example.golan|
+00000200  67 30 0d 06 09 2a 86 48  86 f7 0d 01 01 0b 05 00  |g0...*.H........|
+00000210  03 81 81 00 9d 30 cc 40  2b 5b 50 a0 61 cb ba e5  |.....0.@+[P.a...|
+00000220  53 58 e1 ed 83 28 a9 58  1a a9 38 a4 95 a1 ac 31  |SX...(.X..8....1|
+00000230  5a 1a 84 66 3d 43 d3 2d  d9 0b f2 97 df d3 20 64  |Z..f=C.-...... d|
+00000240  38 92 24 3a 00 bc cf 9c  7d b7 40 20 01 5f aa d3  |8.$:....}.@ ._..|
+00000250  16 61 09 a2 76 fd 13 c3  cc e1 0c 5c ee b1 87 82  |.a..v......\....|
+00000260  f1 6c 04 ed 73 bb b3 43  77 8d 0c 1c f1 0f a1 d8  |.l..s..Cw.......|
+00000270  40 83 61 c9 4c 72 2b 9d  ae db 46 06 06 4d f4 c1  |@.a.Lr+...F..M..|
+00000280  b3 3e c0 d1 bd 42 d4 db  fe 3d 13 60 84 5c 21 d3  |.>...B...=.`.\!.|
+00000290  3b e9 fa e7 16 03 03 00  1b 0d 00 00 17 02 01 40  |;..............@|
+000002a0  00 10 04 01 04 03 05 01  05 03 06 01 06 03 02 01  |................|
+000002b0  02 03 00 00 16 03 03 00  04 0e 00 00 00           |.............|
+>>> Flow 3 (client to server)
+00000000  16 03 03 00 07 0b 00 00  03 00 00 00 16 03 03 00  |................|
+00000010  86 10 00 00 82 00 80 1d  c6 6c b0 b9 b3 41 06 80  |.........l...A..|
+00000020  e0 f5 df 06 ae 0f 2f 5f  72 14 44 47 16 c4 f0 a6  |....../_r.DG....|
+00000030  68 be fa ee ec 9b 38 b0  e4 bd a3 e9 ca 18 5b 25  |h.....8.......[%|
+00000040  33 31 57 86 63 59 0e ce  10 77 f8 42 a6 5c ad 3f  |31W.cY...w.B.\.?|
+00000050  80 85 a5 c1 06 4c 36 aa  f3 ee 62 39 66 69 76 51  |.....L6...b9fivQ|
+00000060  57 cc a0 b1 35 81 d5 38  01 2d 83 0e 2e 6b a9 84  |W...5..8.-...k..|
+00000070  0d 8b 29 93 90 78 2d 0d  33 5f 85 0d 00 0c e2 5f  |..)..x-.3_....._|
+00000080  83 21 28 27 83 ad 9d 19  2d 01 35 6d 85 2e 8d 6b  |.!('....-.5m...k|
+00000090  eb 7a cd 8a 3f 42 e2 14  03 03 00 01 01 16 03 03  |.z..?B..........|
+000000a0  00 40 5e 19 0f d0 4c 17  e0 25 e6 6b a1 d9 ea 59  |.@^...L..%.k...Y|
+000000b0  f4 3a 55 84 2c 50 1e 53  47 78 45 b8 97 f7 7f 3d  |.:U.,P.SGxE....=|
+000000c0  af d9 7a ad 30 30 77 1a  93 05 19 5b 9b 13 70 e0  |..z.00w....[..p.|
+000000d0  e0 f8 ba 6a bd 74 c5 71  0d 5a 2c 3f 2d 98 1a 3c  |...j.t.q.Z,?-..<|
+000000e0  5a 7d                                             |Z}|
+>>> Flow 4 (server to client)
+00000000  15 03 03 00 02 02 2a                              |......*|
diff --git a/libgo/go/crypto/tls/testdata/Server-TLSv12-RSA-PSS-Disabled b/libgo/go/crypto/tls/testdata/Server-TLSv12-RSA-PSS-Disabled
new file mode 100644
index 0000000..302e64e
--- /dev/null
+++ b/libgo/go/crypto/tls/testdata/Server-TLSv12-RSA-PSS-Disabled
@@ -0,0 +1,84 @@
+>>> Flow 1 (client to server)
+00000000  16 03 01 00 cb 01 00 00  c7 03 03 ed 3d 3e 10 95  |............=>..|
+00000010  8b 6f 6c be 5c b7 77 c0  79 91 f8 b3 6f 52 27 18  |.ol.\.w.y...oR'.|
+00000020  0a b7 88 52 df 3c 6c 87  b4 5a 4c 00 00 38 c0 2c  |...R.<l..ZL..8.,|
+00000030  c0 30 00 9f cc a9 cc a8  cc aa c0 2b c0 2f 00 9e  |.0.........+./..|
+00000040  c0 24 c0 28 00 6b c0 23  c0 27 00 67 c0 0a c0 14  |.$.(.k.#.'.g....|
+00000050  00 39 c0 09 c0 13 00 33  00 9d 00 9c 00 3d 00 3c  |.9.....3.....=.<|
+00000060  00 35 00 2f 00 ff 01 00  00 66 00 00 00 0e 00 0c  |.5./.....f......|
+00000070  00 00 09 31 32 37 2e 30  2e 30 2e 31 00 0b 00 04  |...127.0.0.1....|
+00000080  03 00 01 02 00 0a 00 0c  00 0a 00 1d 00 17 00 1e  |................|
+00000090  00 19 00 18 00 16 00 00  00 17 00 00 00 0d 00 30  |...............0|
+000000a0  00 2e 04 03 05 03 06 03  08 07 08 08 08 09 08 0a  |................|
+000000b0  08 0b 08 04 08 05 08 06  04 01 05 01 06 01 03 03  |................|
+000000c0  02 03 03 01 02 01 03 02  02 02 04 02 05 02 06 02  |................|
+>>> Flow 2 (server to client)
+00000000  16 03 03 00 31 02 00 00  2d 03 03 00 00 00 00 00  |....1...-.......|
+00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
+00000020  00 00 00 44 4f 57 4e 47  52 44 01 00 c0 30 00 00  |...DOWNGRD...0..|
+00000030  05 ff 01 00 01 00 16 03  03 02 59 0b 00 02 55 00  |..........Y...U.|
+00000040  02 52 00 02 4f 30 82 02  4b 30 82 01 b4 a0 03 02  |.R..O0..K0......|
+00000050  01 02 02 09 00 e8 f0 9d  3f e2 5b ea a6 30 0d 06  |........?.[..0..|
+00000060  09 2a 86 48 86 f7 0d 01  01 0b 05 00 30 1f 31 0b  |.*.H........0.1.|
+00000070  30 09 06 03 55 04 0a 13  02 47 6f 31 10 30 0e 06  |0...U....Go1.0..|
+00000080  03 55 04 03 13 07 47 6f  20 52 6f 6f 74 30 1e 17  |.U....Go Root0..|
+00000090  0d 31 36 30 31 30 31 30  30 30 30 30 30 5a 17 0d  |.160101000000Z..|
+000000a0  32 35 30 31 30 31 30 30  30 30 30 30 5a 30 1a 31  |250101000000Z0.1|
+000000b0  0b 30 09 06 03 55 04 0a  13 02 47 6f 31 0b 30 09  |.0...U....Go1.0.|
+000000c0  06 03 55 04 03 13 02 47  6f 30 81 9f 30 0d 06 09  |..U....Go0..0...|
+000000d0  2a 86 48 86 f7 0d 01 01  01 05 00 03 81 8d 00 30  |*.H............0|
+000000e0  81 89 02 81 81 00 db 46  7d 93 2e 12 27 06 48 bc  |.......F}...'.H.|
+000000f0  06 28 21 ab 7e c4 b6 a2  5d fe 1e 52 45 88 7a 36  |.(!.~...]..RE.z6|
+00000100  47 a5 08 0d 92 42 5b c2  81 c0 be 97 79 98 40 fb  |G....B[.....y.@.|
+00000110  4f 6d 14 fd 2b 13 8b c2  a5 2e 67 d8 d4 09 9e d6  |Om..+.....g.....|
+00000120  22 38 b7 4a 0b 74 73 2b  c2 34 f1 d1 93 e5 96 d9  |"8.J.ts+.4......|
+00000130  74 7b f3 58 9f 6c 61 3c  c0 b0 41 d4 d9 2b 2b 24  |t{.X.la<..A..++$|
+00000140  23 77 5b 1c 3b bd 75 5d  ce 20 54 cf a1 63 87 1d  |#w[.;.u]. T..c..|
+00000150  1e 24 c4 f3 1d 1a 50 8b  aa b6 14 43 ed 97 a7 75  |.$....P....C...u|
+00000160  62 f4 14 c8 52 d7 02 03  01 00 01 a3 81 93 30 81  |b...R.........0.|
+00000170  90 30 0e 06 03 55 1d 0f  01 01 ff 04 04 03 02 05  |.0...U..........|
+00000180  a0 30 1d 06 03 55 1d 25  04 16 30 14 06 08 2b 06  |.0...U.%..0...+.|
+00000190  01 05 05 07 03 01 06 08  2b 06 01 05 05 07 03 02  |........+.......|
+000001a0  30 0c 06 03 55 1d 13 01  01 ff 04 02 30 00 30 19  |0...U.......0.0.|
+000001b0  06 03 55 1d 0e 04 12 04  10 9f 91 16 1f 43 43 3e  |..U..........CC>|
+000001c0  49 a6 de 6d b6 80 d7 9f  60 30 1b 06 03 55 1d 23  |I..m....`0...U.#|
+000001d0  04 14 30 12 80 10 48 13  49 4d 13 7e 16 31 bb a3  |..0...H.IM.~.1..|
+000001e0  01 d5 ac ab 6e 7b 30 19  06 03 55 1d 11 04 12 30  |....n{0...U....0|
+000001f0  10 82 0e 65 78 61 6d 70  6c 65 2e 67 6f 6c 61 6e  |...example.golan|
+00000200  67 30 0d 06 09 2a 86 48  86 f7 0d 01 01 0b 05 00  |g0...*.H........|
+00000210  03 81 81 00 9d 30 cc 40  2b 5b 50 a0 61 cb ba e5  |.....0.@+[P.a...|
+00000220  53 58 e1 ed 83 28 a9 58  1a a9 38 a4 95 a1 ac 31  |SX...(.X..8....1|
+00000230  5a 1a 84 66 3d 43 d3 2d  d9 0b f2 97 df d3 20 64  |Z..f=C.-...... d|
+00000240  38 92 24 3a 00 bc cf 9c  7d b7 40 20 01 5f aa d3  |8.$:....}.@ ._..|
+00000250  16 61 09 a2 76 fd 13 c3  cc e1 0c 5c ee b1 87 82  |.a..v......\....|
+00000260  f1 6c 04 ed 73 bb b3 43  77 8d 0c 1c f1 0f a1 d8  |.l..s..Cw.......|
+00000270  40 83 61 c9 4c 72 2b 9d  ae db 46 06 06 4d f4 c1  |@.a.Lr+...F..M..|
+00000280  b3 3e c0 d1 bd 42 d4 db  fe 3d 13 60 84 5c 21 d3  |.>...B...=.`.\!.|
+00000290  3b e9 fa e7 16 03 03 00  ac 0c 00 00 a8 03 00 1d  |;...............|
+000002a0  20 2f e5 7d a3 47 cd 62  43 15 28 da ac 5f bb 29  | /.}.G.bC.(.._.)|
+000002b0  07 30 ff f6 84 af c4 cf  c2 ed 90 99 5f 58 cb 3b  |.0.........._X.;|
+000002c0  74 04 01 00 80 a5 a9 75  be 51 ff dc b3 bb 77 79  |t......u.Q....wy|
+000002d0  ef 5b 9f d9 27 6c 76 ea  ce 5c 66 20 03 2e 94 fd  |.[..'lv..\f ....|
+000002e0  28 94 69 ff 06 ab bd 34  43 51 72 fb 15 42 e6 38  |(.i....4CQr..B.8|
+000002f0  c5 7a 5d 7f 35 a7 3c 85  ec df 95 23 0f 28 c7 dc  |.z].5.<....#.(..|
+00000300  0e a6 ec fe 5e 77 3f 95  1d a7 73 1d d8 7b 68 92  |....^w?...s..{h.|
+00000310  5b a5 b8 ba f5 7c a5 60  2e 43 d6 60 64 3e 33 c7  |[....|.`.C.`d>3.|
+00000320  8b c2 56 68 e3 28 2b 2e  8b 9a 85 29 77 73 24 3e  |..Vh.(+....)ws$>|
+00000330  2b 95 b8 40 a7 f1 60 b5  9e 85 3e 1d ae ab 7f 85  |+..@..`...>.....|
+00000340  63 63 d1 cf 62 16 03 03  00 04 0e 00 00 00        |cc..b.........|
+>>> Flow 3 (client to server)
+00000000  16 03 03 00 25 10 00 00  21 20 43 dd 3e 28 34 9f  |....%...! C.>(4.|
+00000010  a9 0c 8e 14 66 01 a1 dd  15 8e 71 b4 05 83 d9 a3  |....f.....q.....|
+00000020  5f 5c a3 31 ad 5c d5 5a  ad 56 14 03 03 00 01 01  |_\.1.\.Z.V......|
+00000030  16 03 03 00 28 f3 ad d2  ec 9e 1e 85 2d 96 5f bc  |....(.......-._.|
+00000040  70 cc 0a c2 22 ef 0a fe  fb b0 77 f1 59 59 08 a6  |p...".....w.YY..|
+00000050  57 39 16 00 82 0b 60 1e  9a 74 75 3a 8a           |W9....`..tu:.|
+>>> Flow 4 (server to client)
+00000000  14 03 03 00 01 01 16 03  03 00 28 00 00 00 00 00  |..........(.....|
+00000010  00 00 00 cf 63 14 29 73  c7 7b 6c 98 50 db 5f 8e  |....c.)s.{l.P._.|
+00000020  f4 de 68 bc c0 60 2c db  9e 1f d9 48 55 51 05 47  |..h..`,....HUQ.G|
+00000030  7e 43 37 17 03 03 00 25  00 00 00 00 00 00 00 01  |~C7....%........|
+00000040  67 0a e7 77 dd 1a 30 87  27 90 b0 42 31 42 09 53  |g..w..0.'..B1B.S|
+00000050  03 bf 0c 10 3a c3 a7 95  e9 6e 63 57 ad 15 03 03  |....:....ncW....|
+00000060  00 1a 00 00 00 00 00 00  00 02 d5 1a ac 66 50 93  |.............fP.|
+00000070  46 0a da 98 1f cc 30 40  c1 47 c7 88              |F.....0@.G..|
diff --git a/libgo/go/crypto/tls/testdata/Server-TLSv12-RSA-PSS-Disabled-Required b/libgo/go/crypto/tls/testdata/Server-TLSv12-RSA-PSS-Disabled-Required
new file mode 100644
index 0000000..9e9570f
--- /dev/null
+++ b/libgo/go/crypto/tls/testdata/Server-TLSv12-RSA-PSS-Disabled-Required
@@ -0,0 +1,54 @@
+>>> Flow 1 (client to server)
+00000000  16 03 01 00 91 01 00 00  8d 03 03 5a 8a 66 22 31  |...........Z.f"1|
+00000010  69 92 30 d5 7b 7c 17 a7  7c 14 d6 3c a9 9e ba dd  |i.0.{|..|..<....|
+00000020  7c 73 fe b4 b4 dd d8 28  39 32 0d 00 00 2a c0 30  ||s.....(92...*.0|
+00000030  00 9f cc a8 cc aa c0 2f  00 9e c0 28 00 6b c0 27  |......./...(.k.'|
+00000040  00 67 c0 14 00 39 c0 13  00 33 00 9d 00 9c 00 3d  |.g...9...3.....=|
+00000050  00 3c 00 35 00 2f 00 ff  01 00 00 3a 00 00 00 0e  |.<.5./.....:....|
+00000060  00 0c 00 00 09 31 32 37  2e 30 2e 30 2e 31 00 0b  |.....127.0.0.1..|
+00000070  00 04 03 00 01 02 00 0a  00 0c 00 0a 00 1d 00 17  |................|
+00000080  00 1e 00 19 00 18 00 16  00 00 00 17 00 00 00 0d  |................|
+00000090  00 04 00 02 08 04                                 |......|
+>>> Flow 2 (server to client)
+00000000  16 03 03 00 31 02 00 00  2d 03 03 00 00 00 00 00  |....1...-.......|
+00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
+00000020  00 00 00 44 4f 57 4e 47  52 44 01 00 c0 30 00 00  |...DOWNGRD...0..|
+00000030  05 ff 01 00 01 00 16 03  03 02 59 0b 00 02 55 00  |..........Y...U.|
+00000040  02 52 00 02 4f 30 82 02  4b 30 82 01 b4 a0 03 02  |.R..O0..K0......|
+00000050  01 02 02 09 00 e8 f0 9d  3f e2 5b ea a6 30 0d 06  |........?.[..0..|
+00000060  09 2a 86 48 86 f7 0d 01  01 0b 05 00 30 1f 31 0b  |.*.H........0.1.|
+00000070  30 09 06 03 55 04 0a 13  02 47 6f 31 10 30 0e 06  |0...U....Go1.0..|
+00000080  03 55 04 03 13 07 47 6f  20 52 6f 6f 74 30 1e 17  |.U....Go Root0..|
+00000090  0d 31 36 30 31 30 31 30  30 30 30 30 30 5a 17 0d  |.160101000000Z..|
+000000a0  32 35 30 31 30 31 30 30  30 30 30 30 5a 30 1a 31  |250101000000Z0.1|
+000000b0  0b 30 09 06 03 55 04 0a  13 02 47 6f 31 0b 30 09  |.0...U....Go1.0.|
+000000c0  06 03 55 04 03 13 02 47  6f 30 81 9f 30 0d 06 09  |..U....Go0..0...|
+000000d0  2a 86 48 86 f7 0d 01 01  01 05 00 03 81 8d 00 30  |*.H............0|
+000000e0  81 89 02 81 81 00 db 46  7d 93 2e 12 27 06 48 bc  |.......F}...'.H.|
+000000f0  06 28 21 ab 7e c4 b6 a2  5d fe 1e 52 45 88 7a 36  |.(!.~...]..RE.z6|
+00000100  47 a5 08 0d 92 42 5b c2  81 c0 be 97 79 98 40 fb  |G....B[.....y.@.|
+00000110  4f 6d 14 fd 2b 13 8b c2  a5 2e 67 d8 d4 09 9e d6  |Om..+.....g.....|
+00000120  22 38 b7 4a 0b 74 73 2b  c2 34 f1 d1 93 e5 96 d9  |"8.J.ts+.4......|
+00000130  74 7b f3 58 9f 6c 61 3c  c0 b0 41 d4 d9 2b 2b 24  |t{.X.la<..A..++$|
+00000140  23 77 5b 1c 3b bd 75 5d  ce 20 54 cf a1 63 87 1d  |#w[.;.u]. T..c..|
+00000150  1e 24 c4 f3 1d 1a 50 8b  aa b6 14 43 ed 97 a7 75  |.$....P....C...u|
+00000160  62 f4 14 c8 52 d7 02 03  01 00 01 a3 81 93 30 81  |b...R.........0.|
+00000170  90 30 0e 06 03 55 1d 0f  01 01 ff 04 04 03 02 05  |.0...U..........|
+00000180  a0 30 1d 06 03 55 1d 25  04 16 30 14 06 08 2b 06  |.0...U.%..0...+.|
+00000190  01 05 05 07 03 01 06 08  2b 06 01 05 05 07 03 02  |........+.......|
+000001a0  30 0c 06 03 55 1d 13 01  01 ff 04 02 30 00 30 19  |0...U.......0.0.|
+000001b0  06 03 55 1d 0e 04 12 04  10 9f 91 16 1f 43 43 3e  |..U..........CC>|
+000001c0  49 a6 de 6d b6 80 d7 9f  60 30 1b 06 03 55 1d 23  |I..m....`0...U.#|
+000001d0  04 14 30 12 80 10 48 13  49 4d 13 7e 16 31 bb a3  |..0...H.IM.~.1..|
+000001e0  01 d5 ac ab 6e 7b 30 19  06 03 55 1d 11 04 12 30  |....n{0...U....0|
+000001f0  10 82 0e 65 78 61 6d 70  6c 65 2e 67 6f 6c 61 6e  |...example.golan|
+00000200  67 30 0d 06 09 2a 86 48  86 f7 0d 01 01 0b 05 00  |g0...*.H........|
+00000210  03 81 81 00 9d 30 cc 40  2b 5b 50 a0 61 cb ba e5  |.....0.@+[P.a...|
+00000220  53 58 e1 ed 83 28 a9 58  1a a9 38 a4 95 a1 ac 31  |SX...(.X..8....1|
+00000230  5a 1a 84 66 3d 43 d3 2d  d9 0b f2 97 df d3 20 64  |Z..f=C.-...... d|
+00000240  38 92 24 3a 00 bc cf 9c  7d b7 40 20 01 5f aa d3  |8.$:....}.@ ._..|
+00000250  16 61 09 a2 76 fd 13 c3  cc e1 0c 5c ee b1 87 82  |.a..v......\....|
+00000260  f1 6c 04 ed 73 bb b3 43  77 8d 0c 1c f1 0f a1 d8  |.l..s..Cw.......|
+00000270  40 83 61 c9 4c 72 2b 9d  ae db 46 06 06 4d f4 c1  |@.a.Lr+...F..M..|
+00000280  b3 3e c0 d1 bd 42 d4 db  fe 3d 13 60 84 5c 21 d3  |.>...B...=.`.\!.|
+00000290  3b e9 fa e7 15 03 03 00  02 02 28                 |;.........(|
diff --git a/libgo/go/crypto/tls/testdata/Server-TLSv13-ClientAuthRequestedAndGiven-PSS-Disabled b/libgo/go/crypto/tls/testdata/Server-TLSv13-ClientAuthRequestedAndGiven-PSS-Disabled
new file mode 100644
index 0000000..89361f1
--- /dev/null
+++ b/libgo/go/crypto/tls/testdata/Server-TLSv13-ClientAuthRequestedAndGiven-PSS-Disabled
@@ -0,0 +1,182 @@
+>>> Flow 1 (client to server)
+00000000  16 03 01 00 e0 01 00 00  dc 03 03 32 03 2a b3 ed  |...........2.*..|
+00000010  c2 1a 71 f2 ff ea 0b 1c  fa f9 c6 88 03 7c 84 89  |..q..........|..|
+00000020  4e 45 60 81 d9 58 dc 9f  0a 60 d1 20 ce 4d 59 a5  |NE`..X...`. .MY.|
+00000030  10 b1 76 53 f5 77 26 fd  17 08 f9 e5 14 03 c4 0a  |..vS.w&.........|
+00000040  65 fd 83 bb a9 3b 24 05  24 1b ef 00 00 08 13 02  |e....;$.$.......|
+00000050  13 03 13 01 00 ff 01 00  00 8b 00 00 00 0e 00 0c  |................|
+00000060  00 00 09 31 32 37 2e 30  2e 30 2e 31 00 0b 00 04  |...127.0.0.1....|
+00000070  03 00 01 02 00 0a 00 0c  00 0a 00 1d 00 17 00 1e  |................|
+00000080  00 19 00 18 00 16 00 00  00 17 00 00 00 0d 00 1e  |................|
+00000090  00 1c 04 03 05 03 06 03  08 07 08 08 08 09 08 0a  |................|
+000000a0  08 0b 08 04 08 05 08 06  04 01 05 01 06 01 00 2b  |...............+|
+000000b0  00 03 02 03 04 00 2d 00  02 01 01 00 33 00 26 00  |......-.....3.&.|
+000000c0  24 00 1d 00 20 06 b0 03  80 81 d6 e7 f4 31 85 4c  |$... ........1.L|
+000000d0  e3 50 35 c1 df 6e 28 9f  38 ce c0 7b fc 71 00 8c  |.P5..n(.8..{.q..|
+000000e0  9a 25 07 95 57                                    |.%..W|
+>>> Flow 2 (server to client)
+00000000  16 03 03 00 7a 02 00 00  76 03 03 00 00 00 00 00  |....z...v.......|
+00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
+00000020  00 00 00 00 00 00 00 00  00 00 00 20 ce 4d 59 a5  |........... .MY.|
+00000030  10 b1 76 53 f5 77 26 fd  17 08 f9 e5 14 03 c4 0a  |..vS.w&.........|
+00000040  65 fd 83 bb a9 3b 24 05  24 1b ef 00 13 02 00 00  |e....;$.$.......|
+00000050  2e 00 2b 00 02 03 04 00  33 00 24 00 1d 00 20 2f  |..+.....3.$... /|
+00000060  e5 7d a3 47 cd 62 43 15  28 da ac 5f bb 29 07 30  |.}.G.bC.(.._.).0|
+00000070  ff f6 84 af c4 cf c2 ed  90 99 5f 58 cb 3b 74 14  |.........._X.;t.|
+00000080  03 03 00 01 01 17 03 03  00 17 ad ce ff 21 b8 39  |.............!.9|
+00000090  16 f6 10 6e 8d 6c 0f 46  2f 58 55 b3 e4 4f 2d 5c  |...n.l.F/XU..O-\|
+000000a0  26 17 03 03 00 3c fd 24  07 75 28 2b f2 ec d9 74  |&....<.$.u(+...t|
+000000b0  f0 76 e4 02 e6 02 bd 47  58 0f 68 60 ac 6c 59 a8  |.v.....GX.h`.lY.|
+000000c0  87 94 b9 cb c3 fa 41 15  4c 95 b8 58 da 8c d9 ea  |......A.L..X....|
+000000d0  3a ab 0c 06 83 a5 2b d1  39 6f 32 92 bf e1 c0 f4  |:.....+.9o2.....|
+000000e0  49 51 17 03 03 02 6d 22  dc 8c fc ae 21 96 41 17  |IQ....m"....!.A.|
+000000f0  45 93 6e 08 61 6b 46 b9  9a cf 2e 79 a8 1a 46 30  |E.n.akF....y..F0|
+00000100  a4 de 3d 53 87 bf 57 3a  44 4f 5b 3f c9 b2 f0 0e  |..=S..W:DO[?....|
+00000110  56 5f 5a ee 5a 1f df cc  fe f3 54 ab 87 d7 bb 00  |V_Z.Z.....T.....|
+00000120  2c 61 de ad 31 9c d4 cf  43 bf e7 84 d1 1d 3c cb  |,a..1...C.....<.|
+00000130  82 d1 81 9d 13 90 6b c8  fd 01 53 4f 13 a5 91 a4  |......k...SO....|
+00000140  fe 20 ce 2c 34 96 62 b7  6f f0 f0 65 f0 01 18 99  |. .,4.b.o..e....|
+00000150  31 3d cb c6 72 6f 54 d6  ec fa a3 dd 94 67 6b b9  |1=..roT......gk.|
+00000160  ff 2c 41 ba 00 d5 25 ba  b1 7a e5 d2 1c 0b 37 ad  |.,A...%..z....7.|
+00000170  df 0b 62 be b3 69 5b 84  39 2d 72 c2 b9 ec 68 87  |..b..i[.9-r...h.|
+00000180  32 23 92 4b a8 f0 17 25  0f d7 86 97 45 65 73 e1  |2#.K...%....Ees.|
+00000190  49 c4 3c 8d 26 43 34 06  4c be 50 76 ae 63 6f 1d  |I.<.&C4.L.Pv.co.|
+000001a0  ed 57 93 5a 7f 98 e2 1e  5f 94 74 a2 54 59 63 12  |.W.Z...._.t.TYc.|
+000001b0  bb 8b df 77 20 3a 9c ea  c7 40 b0 cf 8e 7f f8 98  |...w :...@......|
+000001c0  06 92 38 be 77 11 17 03  c2 ac af fc 8d 7d d5 6b  |..8.w........}.k|
+000001d0  f7 2b 7a f3 b8 dc b0 cf  3e f7 c5 f4 b3 34 4b 06  |.+z.....>....4K.|
+000001e0  c6 ed b5 dc 0c 2d 4e bc  03 94 cc 03 f2 9f 5d c6  |.....-N.......].|
+000001f0  57 36 5a 01 81 65 27 75  1d 4f 22 9f b5 da 7f e2  |W6Z..e'u.O".....|
+00000200  7d 36 f3 4b 05 3f 40 47  c6 1b af e6 99 c0 ca 35  |}6.K.?@G.......5|
+00000210  98 c8 30 60 7b 42 4e e7  5c 90 28 d7 4e db f3 78  |..0`{BN.\.(.N..x|
+00000220  22 e2 a3 86 0c 9e 19 43  0e 89 d4 f6 78 38 21 16  |"......C....x8!.|
+00000230  84 38 36 6a 2d a5 94 2c  52 2b 00 de 67 16 e8 89  |.86j-..,R+..g...|
+00000240  32 21 0e fd b0 23 91 06  8b fa 82 70 21 bc 1f 29  |2!...#.....p!..)|
+00000250  32 af f4 b9 15 7f aa 22  c1 e8 e3 2c 92 b4 d8 2a  |2......"...,...*|
+00000260  64 58 f4 f1 85 85 14 92  f3 16 8e 2d 5b a6 7e ef  |dX.........-[.~.|
+00000270  22 5a 58 bb 4c f1 36 70  2f ca 03 df fb 0a d0 03  |"ZX.L.6p/.......|
+00000280  55 5d d9 6b 63 48 d2 75  82 d4 56 af 17 5a 60 4f  |U].kcH.u..V..Z`O|
+00000290  af 8b 17 d6 fd 96 be 3d  82 25 0e 73 2e 58 0e 0a  |.......=.%.s.X..|
+000002a0  5c 2d c8 f5 17 b0 ae 7d  39 90 cb 75 bb 4b 33 22  |\-.....}9..u.K3"|
+000002b0  bd a2 02 00 70 43 a8 54  ee 7c 25 d5 d7 88 08 f6  |....pC.T.|%.....|
+000002c0  3f 34 61 55 f5 d3 53 0c  8c b1 9b fd 4e d9 65 7a  |?4aU..S.....N.ez|
+000002d0  2b 6e b4 d5 37 34 18 f3  14 00 9f 56 40 d9 15 ea  |+n..74.....V@...|
+000002e0  59 5a 4b 4a bb f7 19 72  60 4a 08 8f 75 d6 7b a4  |YZKJ...r`J..u.{.|
+000002f0  de 79 c5 21 1a cb 82 97  b3 88 d8 ae 65 30 cc 56  |.y.!........e0.V|
+00000300  da a3 04 5c 63 f4 44 a5  eb 05 55 ad 78 46 44 ac  |...\c.D...U.xFD.|
+00000310  56 2e f6 f7 eb 47 f6 f1  62 8d df 27 7d 86 5e 58  |V....G..b..'}.^X|
+00000320  5f 4c 34 6e f6 c0 fd 56  7d 46 82 5d 53 db 2a 84  |_L4n...V}F.]S.*.|
+00000330  45 db e7 9c b9 23 32 59  cf 85 f7 12 c5 e8 9e 3c  |E....#2Y.......<|
+00000340  2d 3f 81 a5 24 cf 36 ad  d6 65 02 35 84 de 43 f8  |-?..$.6..e.5..C.|
+00000350  04 e2 8b ae 17 03 03 00  99 ce e8 48 a3 34 5e fb  |...........H.4^.|
+00000360  76 f1 e4 3b da 94 0a 25  ee 78 f6 31 24 10 05 25  |v..;...%.x.1$..%|
+00000370  9c e5 ca fc ef c5 66 86  08 15 d8 69 75 d8 49 e9  |......f....iu.I.|
+00000380  9b 86 71 3f 1f 41 ee f0  bc 8d 4e aa bc 30 f0 8f  |..q?.A....N..0..|
+00000390  7b b1 94 7e aa 74 3f eb  23 c5 c9 aa 9a c3 f7 12  |{..~.t?.#.......|
+000003a0  23 30 95 2e e1 1b 9c fe  8b 50 b1 d9 17 cf af a1  |#0.......P......|
+000003b0  ff ce 8d fa 7e bd 23 59  d0 7a fb 30 12 f4 8d 86  |....~.#Y.z.0....|
+000003c0  0c 3c fd 03 50 d4 7f bb  f6 fa ba 1d fc 32 cc 7e  |.<..P........2.~|
+000003d0  12 3a 33 90 c6 82 5d 6a  90 23 6d b8 e6 60 7d d3  |.:3...]j.#m..`}.|
+000003e0  a8 f0 0c 75 bc b5 67 68  ed 58 ef 4d ac 91 47 c9  |...u..gh.X.M..G.|
+000003f0  c4 bc 17 03 03 00 45 ae  0d 8d 76 8d 28 34 1b 09  |......E...v.(4..|
+00000400  4d d5 df 2e aa f8 ff 71  b2 0e 60 a1 ce 8a 58 9c  |M......q..`...X.|
+00000410  45 64 31 6c 9b 46 66 64  27 98 e6 f3 93 e8 92 81  |Ed1l.Ffd'.......|
+00000420  3d 4f db da 98 72 0d b7  71 27 ac 2b 61 81 97 0b  |=O...r..q'.+a...|
+00000430  e7 ae 32 d7 e2 66 4d 5d  f7 01 d0 77              |..2..fM]...w|
+>>> Flow 3 (client to server)
+00000000  14 03 03 00 01 01 17 03  03 02 11 f6 03 90 9e bc  |................|
+00000010  dc 00 9b f9 dd 7b 65 dd  b0 69 b4 b5 42 fc 25 f2  |.....{e..i..B.%.|
+00000020  2b 7e be 52 1a 4b f1 e4  21 94 0d 88 4a 58 07 37  |+~.R.K..!...JX.7|
+00000030  67 c7 e3 c4 62 eb 17 57  5d 52 d4 a9 03 39 0e 7d  |g...b..W]R...9.}|
+00000040  d0 c3 1a 8d ef ec b7 a8  9b 93 50 0d 7f fd a1 10  |..........P.....|
+00000050  b6 82 99 21 3f e3 3d 3d  47 04 c3 cd a7 b3 ab e0  |...!?.==G.......|
+00000060  f6 33 47 0e 1c 30 36 45  21 32 34 c2 2c 72 20 72  |.3G..06E!24.,r r|
+00000070  b6 c7 5b 95 8a 97 84 54  2e d0 5f d5 80 e7 8f 7a  |..[....T.._....z|
+00000080  6f 50 96 8a 33 13 c6 97  85 25 47 6b 8a b2 a0 29  |oP..3....%Gk...)|
+00000090  cd 7f 0e 38 94 53 08 8b  c3 2f 89 a2 10 c2 22 5a  |...8.S.../...."Z|
+000000a0  95 42 a3 45 73 a8 d0 ac  6d ba 95 a4 51 63 b9 b4  |.B.Es...m...Qc..|
+000000b0  79 61 be dd c6 ab 97 72  38 30 63 55 a7 7d 9a eb  |ya.....r80cU.}..|
+000000c0  bb 5a f6 d0 3d 05 81 5d  0e e5 7a 8b ae fe d2 3b  |.Z..=..]..z....;|
+000000d0  db 85 3a 13 81 ee 36 b3  ff 41 47 d1 67 bf 17 5e  |..:...6..AG.g..^|
+000000e0  9d a3 4c 92 51 a9 1b 4b  ca 13 f6 ee 8a e5 b3 01  |..L.Q..K........|
+000000f0  e7 87 ee 1e 2a 9e 56 3d  01 7e 0f cb e5 d6 ea 13  |....*.V=.~......|
+00000100  05 3e 8c 5a 24 d0 36 6b  54 9f 8e 3f 07 73 a0 bf  |.>.Z$.6kT..?.s..|
+00000110  84 c2 90 72 ce 48 50 49  47 27 b3 14 56 5c c7 63  |...r.HPIG'..V\.c|
+00000120  7e 7e b5 8f 9d 6d 70 32  6f 3f 4d 53 80 ae f6 2b  |~~...mp2o?MS...+|
+00000130  fb c9 7a de 76 aa 68 a3  9b a9 a7 47 55 d0 cb f8  |..z.v.h....GU...|
+00000140  e8 c4 1c f5 0f 54 82 5b  c5 45 18 41 05 da 72 ce  |.....T.[.E.A..r.|
+00000150  84 d1 8b 00 40 e9 f9 cf  b5 d5 3e 71 ee 25 dc 7d  |....@.....>q.%.}|
+00000160  3b 00 67 68 9d 78 d2 c0  7b cb 5d 9e 79 2c b5 f4  |;.gh.x..{.].y,..|
+00000170  1b ea b8 d8 de bd 36 71  2a 26 49 44 1b 5b 92 ad  |......6q*&ID.[..|
+00000180  1c 2d 2f ab 8e 15 d7 b3  96 89 da 58 77 75 42 32  |.-/........XwuB2|
+00000190  c3 6b f1 5e 0b da 91 71  1e d5 f1 dd 32 d8 b6 a5  |.k.^...q....2...|
+000001a0  21 a1 1d 5e b1 df 01 37  33 ac 93 11 94 6d b8 e6  |!..^...73....m..|
+000001b0  3b be 86 31 da cf b6 ab  cd f5 12 4f 85 45 24 06  |;..1.......O.E$.|
+000001c0  34 40 7b c5 f8 5f c3 f9  3b cf 9d 2a b3 2e 65 e4  |4@{.._..;..*..e.|
+000001d0  0e ed fc 7c b4 2b 32 bf  0e 8f b3 85 93 74 8b e8  |...|.+2......t..|
+000001e0  25 e0 47 c0 d8 52 8e c9  ed 7f 16 41 3f b3 79 d8  |%.G..R.....A?.y.|
+000001f0  d1 47 19 ae fb ab 97 a5  b2 42 7c a0 73 ad 4f 62  |.G.......B|.s.Ob|
+00000200  cf 35 52 7c d6 47 b8 1f  e9 65 b0 99 f7 67 e7 64  |.5R|.G...e...g.d|
+00000210  14 83 46 c7 90 6e 4d 01  3a c2 e6 19 17 03 03 00  |..F..nM.:.......|
+00000220  99 a5 e0 38 3a 91 4a 1d  87 9a eb a6 95 87 35 fc  |...8:.J.......5.|
+00000230  ae 42 8d 3a fe f6 39 f3  c2 c2 f0 9a f5 8f b5 75  |.B.:..9........u|
+00000240  18 6b 84 c0 5b 96 6a 9c  0c aa 81 fc 9a 2e 01 f7  |.k..[.j.........|
+00000250  d8 b1 5d 4a 54 cf 79 90  fb 79 57 ff d9 d1 46 59  |..]JT.y..yW...FY|
+00000260  02 84 3d ee cc 68 ea 05  1d a2 79 fb 1d 1e d6 ad  |..=..h....y.....|
+00000270  5b 95 3b 6b 9a c9 07 e5  e4 20 07 6a a0 74 c8 1a  |[.;k..... .j.t..|
+00000280  31 53 a4 e6 bb bb 28 61  47 41 d5 f3 45 38 71 86  |1S....(aGA..E8q.|
+00000290  35 12 f4 8a f2 e4 e9 ae  96 a9 14 ce 8a 1c 5d 59  |5.............]Y|
+000002a0  3c d7 3a e7 93 35 c2 53  9f d8 4d cb 98 bd e1 72  |<.:..5.S..M....r|
+000002b0  a8 80 55 a6 cd 9c 50 41  ec 50 17 03 03 00 45 2d  |..U...PA.P....E-|
+000002c0  90 3b 73 cc 24 52 ad 22  90 0e 7d bf 2a a2 44 09  |.;s.$R."..}.*.D.|
+000002d0  e2 43 61 f2 48 9b 73 85  00 05 8b 0a 51 ad a0 c0  |.Ca.H.s.....Q...|
+000002e0  64 ef 5e 11 86 37 b0 32  af 11 f7 98 7b 74 39 90  |d.^..7.2....{t9.|
+000002f0  fa d0 32 f3 fe 4d 01 6b  78 75 31 7e 67 4f 61 0f  |..2..M.kxu1~gOa.|
+00000300  bb c6 3e c0                                       |..>.|
+>>> Flow 4 (server to client)
+00000000  17 03 03 02 9b f5 b2 d6  62 fe e0 c8 8d cc 7a cd  |........b.....z.|
+00000010  29 51 b2 77 0d 9a 54 fb  43 6d f6 9c e1 ff 28 be  |)Q.w..T.Cm....(.|
+00000020  fc 50 68 80 2f 1c 4f 50  44 95 64 49 0a 66 fe 79  |.Ph./.OPD.dI.f.y|
+00000030  46 ba 88 e9 03 be 5c 91  60 84 78 03 a8 c6 21 90  |F.....\.`.x...!.|
+00000040  cd 79 de 2d 2f 81 dd 08  1f 52 1a 0e d8 69 16 22  |.y.-/....R...i."|
+00000050  a6 59 5b 2b 85 08 00 16  e7 85 bd 43 9a cc ce e6  |.Y[+.......C....|
+00000060  3a ee 70 25 0b 95 90 4b  c0 42 4a 48 25 d3 50 92  |:.p%...K.BJH%.P.|
+00000070  19 e1 3e b8 72 c5 a1 e8  dd 9f a4 57 2d b0 a6 24  |..>.r......W-..$|
+00000080  8b 8c 55 41 f3 26 45 dd  dd 2b d3 15 8d d9 ca e4  |..UA.&E..+......|
+00000090  15 6e b5 6d 99 79 ba 46  00 e6 5e 75 52 fd f9 26  |.n.m.y.F..^uR..&|
+000000a0  cf cd 69 cf be 29 a7 b9  7d 1b 1d 6b ab 17 ee 4e  |..i..)..}..k...N|
+000000b0  f5 24 b0 89 0f b5 c7 41  4e ea cd 32 98 47 23 bc  |.$.....AN..2.G#.|
+000000c0  91 03 b1 23 e0 5c 5e 37  40 95 da 90 ef eb 95 81  |...#.\^7@.......|
+000000d0  7b 2d c7 15 8f f8 2d ba  69 41 0e a9 eb 19 6c 6c  |{-....-.iA....ll|
+000000e0  73 b0 05 fc b9 f4 76 91  2b 6a 72 fa d6 e5 87 a9  |s.....v.+jr.....|
+000000f0  90 49 81 8c d5 fa 78 a2  a1 8f 77 c7 35 78 1b ba  |.I....x...w.5x..|
+00000100  ac 3c 41 51 ce 4e 99 c9  74 a0 bc 51 12 b5 15 2c  |.<AQ.N..t..Q...,|
+00000110  8e 36 6e e1 c9 bb 0f d2  fd 00 97 56 de 66 a9 19  |.6n........V.f..|
+00000120  c7 2f 18 e5 67 b4 34 73  9e b2 6f 68 26 8d 2f da  |./..g.4s..oh&./.|
+00000130  92 bd 52 13 32 3c 49 80  8c c7 3c 11 9d 9f 05 c0  |..R.2<I...<.....|
+00000140  aa 5d 63 33 8e 07 60 20  6a 01 1f 5a 16 45 4d ba  |.]c3..` j..Z.EM.|
+00000150  b0 2a 5c 26 b1 ea 26 72  59 c5 b0 59 8a 1a cb 9a  |.*\&..&rY..Y....|
+00000160  6a 54 55 06 75 37 a0 c9  04 4e 2f 61 de ef b5 df  |jTU.u7...N/a....|
+00000170  68 ae 42 03 29 91 e3 1d  a0 6b 18 4d 17 23 3d 61  |h.B.)....k.M.#=a|
+00000180  87 72 06 9f 45 98 0d 1e  f7 f1 f5 f3 f7 04 a5 98  |.r..E...........|
+00000190  29 c2 2e 77 d9 2c 95 df  5d 3d 20 41 36 26 1b 46  |)..w.,..]= A6&.F|
+000001a0  ea 54 9e a3 96 05 ba f7  33 01 85 b0 d1 9f 78 3c  |.T......3.....x<|
+000001b0  0f 73 0d 04 52 7f 02 f4  cb 79 f1 e2 d1 63 60 d6  |.s..R....y...c`.|
+000001c0  e1 34 05 23 79 c3 37 eb  d0 5b ea bc f4 f9 bb 7a  |.4.#y.7..[.....z|
+000001d0  85 9e 42 50 3c c8 f8 e6  f4 93 71 c2 6a 46 b9 26  |..BP<.....q.jF.&|
+000001e0  8c 17 b4 c9 65 00 fb 9a  d6 54 ab e6 71 c1 1b 5a  |....e....T..q..Z|
+000001f0  51 a2 6f df 0b 52 29 8c  c3 ec 8e bf 31 36 93 7e  |Q.o..R).....16.~|
+00000200  59 cc ca 49 71 dc ce 84  40 7d 43 81 5c 96 ed ca  |Y..Iq...@}C.\...|
+00000210  d1 e6 15 40 cf 19 f4 ed  61 28 9a e3 6b e7 1c 9b  |...@....a(..k...|
+00000220  c1 71 d0 46 ef 79 3b d8  35 e3 7b 47 3f a2 78 76  |.q.F.y;.5.{G?.xv|
+00000230  17 58 13 67 5f 4e f0 ed  2e e9 84 e1 92 0c a6 36  |.X.g_N.........6|
+00000240  5c 5b de 8e 5c 04 ed d4  a4 75 10 fd 85 9c e5 8e  |\[..\....u......|
+00000250  ca 02 14 fb 91 8b 85 14  79 e5 97 1f 63 46 48 90  |........y...cFH.|
+00000260  26 c7 2f a2 c0 18 71 d9  2e e3 81 78 7b 74 67 e0  |&./...q....x{tg.|
+00000270  e1 ef 48 af 41 96 9f 1a  44 d8 6c 94 49 3e 9b 47  |..H.A...D.l.I>.G|
+00000280  71 63 2f 0c 94 c9 42 ac  bc 4c 0a 16 fe 9a 90 eb  |qc/...B..L......|
+00000290  02 75 16 1a 10 23 b2 75  67 c7 c5 17 55 9b cf 69  |.u...#.ug...U..i|
+000002a0  17 03 03 00 1e 45 8c ed  99 0f 8a 83 d8 89 70 49  |.....E........pI|
+000002b0  17 a8 fd 2b 6e ef ff 53  fa 99 52 89 ee 8b 19 f1  |...+n..S..R.....|
+000002c0  41 09 30 17 03 03 00 13  14 f0 f6 ef c5 f9 52 15  |A.0...........R.|
+000002d0  77 de 5e 46 63 8d 3b 2f  07 84 aa                 |w.^Fc.;/...|
diff --git a/libgo/go/crypto/tls/testdata/Server-TLSv13-RSA-PSS-Disabled b/libgo/go/crypto/tls/testdata/Server-TLSv13-RSA-PSS-Disabled
new file mode 100644
index 0000000..c13db8d
--- /dev/null
+++ b/libgo/go/crypto/tls/testdata/Server-TLSv13-RSA-PSS-Disabled
@@ -0,0 +1,103 @@
+>>> Flow 1 (client to server)
+00000000  16 03 01 00 e0 01 00 00  dc 03 03 1e 9f 50 05 56  |.............P.V|
+00000010  a7 21 c8 df 56 a8 f3 bb  e4 15 3b b0 04 e5 f5 10  |.!..V.....;.....|
+00000020  d8 5b 0e 68 d3 b4 39 64  b5 89 9c 20 5a 6b 29 6d  |.[.h..9d... Zk)m|
+00000030  22 a0 e0 fb 7f 2d 87 48  e7 b4 c9 b3 5a d0 2b c7  |"....-.H....Z.+.|
+00000040  ad d8 e4 ad d5 eb 81 b3  1f 61 0e 65 00 08 13 02  |.........a.e....|
+00000050  13 03 13 01 00 ff 01 00  00 8b 00 00 00 0e 00 0c  |................|
+00000060  00 00 09 31 32 37 2e 30  2e 30 2e 31 00 0b 00 04  |...127.0.0.1....|
+00000070  03 00 01 02 00 0a 00 0c  00 0a 00 1d 00 17 00 1e  |................|
+00000080  00 19 00 18 00 16 00 00  00 17 00 00 00 0d 00 1e  |................|
+00000090  00 1c 04 03 05 03 06 03  08 07 08 08 08 09 08 0a  |................|
+000000a0  08 0b 08 04 08 05 08 06  04 01 05 01 06 01 00 2b  |...............+|
+000000b0  00 03 02 03 04 00 2d 00  02 01 01 00 33 00 26 00  |......-.....3.&.|
+000000c0  24 00 1d 00 20 ba 67 99  b3 60 71 ed 6c bb 8d 7e  |$... .g..`q.l..~|
+000000d0  4c c3 ea 37 6d 90 b6 f8  91 67 71 2c 84 a7 32 3a  |L..7m....gq,..2:|
+000000e0  23 2a 90 13 35                                    |#*..5|
+>>> Flow 2 (server to client)
+00000000  16 03 03 00 7a 02 00 00  76 03 03 00 00 00 00 00  |....z...v.......|
+00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
+00000020  00 00 00 00 00 00 00 00  00 00 00 20 5a 6b 29 6d  |........... Zk)m|
+00000030  22 a0 e0 fb 7f 2d 87 48  e7 b4 c9 b3 5a d0 2b c7  |"....-.H....Z.+.|
+00000040  ad d8 e4 ad d5 eb 81 b3  1f 61 0e 65 13 02 00 00  |.........a.e....|
+00000050  2e 00 2b 00 02 03 04 00  33 00 24 00 1d 00 20 2f  |..+.....3.$... /|
+00000060  e5 7d a3 47 cd 62 43 15  28 da ac 5f bb 29 07 30  |.}.G.bC.(.._.).0|
+00000070  ff f6 84 af c4 cf c2 ed  90 99 5f 58 cb 3b 74 14  |.........._X.;t.|
+00000080  03 03 00 01 01 17 03 03  00 17 d9 74 68 ee e6 54  |...........th..T|
+00000090  e3 7a 0e ee 86 c7 a8 bb  c7 65 fc e4 c4 6c 58 7a  |.z.......e...lXz|
+000000a0  1e 17 03 03 02 6d 98 c3  0c cc 80 fe ea 70 13 4e  |.....m.......p.N|
+000000b0  2f f6 49 99 5f 27 0a f9  4d cf e5 1a 9a 37 fb e7  |/.I._'..M....7..|
+000000c0  3b a4 60 82 43 df fb fa  47 15 6f d8 db d2 3e c3  |;.`.C...G.o...>.|
+000000d0  dd a0 37 ca b2 b4 c9 1b  5c 86 4a e0 7e 06 1e 27  |..7.....\.J.~..'|
+000000e0  73 c6 cd 54 37 df 95 b1  c6 d5 44 85 2c 67 7d a7  |s..T7.....D.,g}.|
+000000f0  2a 7d 87 86 5e f3 e5 60  f8 7c de bf 78 89 35 9b  |*}..^..`.|..x.5.|
+00000100  d1 0b 8a dd 6f 40 d8 5a  55 10 e2 71 b0 7a 5e 4b  |....o@.ZU..q.z^K|
+00000110  86 18 be 18 a7 f8 8e c6  ae 8c 1e df bf 84 77 c5  |..............w.|
+00000120  dc b1 17 26 72 ea bb 9b  28 6c bf 19 8d 1a 22 90  |...&r...(l....".|
+00000130  0f 19 92 5b ff db 07 84  48 61 68 f0 50 20 76 a3  |...[....Hah.P v.|
+00000140  d3 f2 4a 3b 60 f5 73 cb  61 f7 11 63 f2 a7 0e 18  |..J;`.s.a..c....|
+00000150  30 96 d0 17 f1 2f 58 09  49 33 15 3e 31 e4 17 e8  |0..../X.I3.>1...|
+00000160  07 48 b5 43 06 40 60 4f  a0 78 0d 51 0c 3f 0f 1a  |.H.C.@`O.x.Q.?..|
+00000170  8c 95 7a 3e 36 66 36 22  dc 58 4e b7 3e 19 ad de  |..z>6f6".XN.>...|
+00000180  c9 f9 b0 76 e4 e2 8c 04  27 6f 67 8f fe 86 b9 41  |...v....'og....A|
+00000190  53 7d 9f d1 e0 a6 0b ec  fc c0 82 bf 00 36 28 4d  |S}...........6(M|
+000001a0  20 3a e3 42 67 87 16 64  6c 4f e2 54 23 d1 0f 32  | :.Bg..dlO.T#..2|
+000001b0  e9 16 9a da 46 a6 39 18  d5 6e a6 93 25 de a1 77  |....F.9..n..%..w|
+000001c0  d9 26 b5 7c b4 85 8a 69  48 90 11 a9 8c 42 ca b8  |.&.|...iH....B..|
+000001d0  88 63 df ec 6c e3 9f 2c  29 75 9b 57 79 8b 69 66  |.c..l..,)u.Wy.if|
+000001e0  16 9e 93 48 04 8a 41 e0  8b 0e fb a5 9c fd 68 f6  |...H..A.......h.|
+000001f0  5f ab 89 11 e4 aa 4c 6c  92 df b3 a3 39 f0 38 d9  |_.....Ll....9.8.|
+00000200  7d 1b 42 13 ee d1 83 e2  20 3f 60 81 96 d9 63 2c  |}.B..... ?`...c,|
+00000210  e8 54 a5 08 41 9b 1d 02  41 37 a2 ce 0c 9b 34 bf  |.T..A...A7....4.|
+00000220  43 c5 ac 90 67 cd 6b b6  55 31 36 b1 2b 0e ed 8c  |C...g.k.U16.+...|
+00000230  23 ae 71 b2 ab f3 94 68  f2 f6 87 d3 87 61 ca aa  |#.q....h.....a..|
+00000240  0b 65 63 a1 11 dc 6d 74  33 c8 24 a6 ae 40 27 c7  |.ec...mt3.$..@'.|
+00000250  d4 06 51 89 15 35 66 21  b0 82 15 87 70 c5 b8 8d  |..Q..5f!....p...|
+00000260  34 48 ff 41 e0 1a b0 46  f7 38 47 53 64 f7 a3 a2  |4H.A...F.8GSd...|
+00000270  61 96 72 ea 90 de 86 18  64 49 91 ed 97 05 e3 27  |a.r.....dI.....'|
+00000280  47 df ea 06 c6 28 f9 79  51 5e 64 b6 de 52 75 8a  |G....(.yQ^d..Ru.|
+00000290  79 8d 8e a6 d5 b0 f1 a6  ab 76 44 25 4b 80 5e e4  |y........vD%K.^.|
+000002a0  d4 aa c6 2d 77 1a 49 52  16 d6 73 6b 18 2d d1 a6  |...-w.IR..sk.-..|
+000002b0  4c e1 be 4d f8 79 34 a1  4c 81 88 9c 4b 85 f3 28  |L..M.y4.L...K..(|
+000002c0  97 fc 3a 7e cf d4 81 2c  d3 57 df 09 f5 49 f5 cf  |..:~...,.W...I..|
+000002d0  c7 7c 22 b3 8e 95 0f 97  6d d1 56 e3 43 7e 52 0f  |.|".....m.V.C~R.|
+000002e0  d4 da 3f e0 4e 06 b9 84  18 7d 7c 56 49 e0 d7 4a  |..?.N....}|VI..J|
+000002f0  d6 df c4 70 0c 74 5b 1f  4d 76 28 cd 3b b0 9e 27  |...p.t[.Mv(.;..'|
+00000300  cc 6b 1a 13 41 1a 6b bf  0d 2d 93 b2 d5 7e 7e 25  |.k..A.k..-...~~%|
+00000310  0e 8a 9c 17 03 03 00 99  df 4b 8e 3e d0 14 be 76  |.........K.>...v|
+00000320  f1 d3 ca b1 39 c0 7e 6c  4f 8c d9 0d b8 83 07 39  |....9.~lO......9|
+00000330  08 55 13 1e 3d 68 0f 99  9f 9a 68 1f 57 6a aa 41  |.U..=h....h.Wj.A|
+00000340  a4 40 2b 12 f2 4b 6c db  3c 59 fa 99 5c e2 c7 2d  |.@+..Kl.<Y..\..-|
+00000350  4b 55 4c 27 b1 6c bf 99  c3 36 1d 73 7a 8b fd bc  |KUL'.l...6.sz...|
+00000360  93 77 27 f5 9e cd 10 61  bc 8d b5 bf 7b bb 69 00  |.w'....a....{.i.|
+00000370  f9 f0 d3 22 dd 4e 7d 12  5a 61 49 1d d4 29 14 43  |...".N}.ZaI..).C|
+00000380  e5 62 ab d8 c6 78 75 80  4b 7a 6b 3f af 4b 92 2a  |.b...xu.Kzk?.K.*|
+00000390  23 29 da 85 c0 d7 35 03  9d ed 9c f7 83 39 cf cb  |#)....5......9..|
+000003a0  0f 85 5e 9f 29 61 d8 a2  d0 cb 14 2d 71 50 6f d5  |..^.)a.....-qPo.|
+000003b0  c2 17 03 03 00 45 be 9b  ee 5d e1 08 8a c2 d6 67  |.....E...].....g|
+000003c0  df 3b 84 50 28 30 69 bd  11 89 6a ab 02 ad d7 79  |.;.P(0i...j....y|
+000003d0  8b 2c 0a a9 9c ce e5 30  49 2d 59 82 e8 ee d3 03  |.,.....0I-Y.....|
+000003e0  77 d3 fc 22 dd 81 be e6  f4 22 36 8d 8e b1 7c 4a  |w.."....."6...|J|
+000003f0  b9 9c 6a ea 3f f0 aa ac  ec b6 c7 17 03 03 00 a3  |..j.?...........|
+00000400  69 e0 19 38 57 54 62 6c  28 d9 54 94 79 6e 7b 48  |i..8WTbl(.T.yn{H|
+00000410  25 55 7f 5f bb cc 91 07  30 47 55 9b f3 6e b9 ba  |%U._....0GU..n..|
+00000420  50 65 9b e9 81 5d 53 20  cd 27 5d ee 92 93 01 8f  |Pe...]S .'].....|
+00000430  5a d6 02 b9 26 1b 45 c3  40 26 6b 81 c3 ba 1e 3c  |Z...&.E.@&k....<|
+00000440  e6 03 93 b0 18 fe 2d be  07 97 b1 a1 a7 55 8f d8  |......-......U..|
+00000450  96 7a 58 ad 7d c1 72 71  d9 25 07 56 22 9a 7a f9  |.zX.}.rq.%.V".z.|
+00000460  4a 1b 82 30 e9 fb b0 26  81 45 d2 45 5b 1c 7d 97  |J..0...&.E.E[.}.|
+00000470  89 6d 17 69 81 27 a6 4c  be d0 78 1d b5 6c 3f 94  |.m.i.'.L..x..l?.|
+00000480  ef e4 6b ec 02 63 8b bf  f9 00 8a 8a 46 43 5d e0  |..k..c......FC].|
+00000490  52 38 8c d5 76 d7 79 42  a3 6b 35 e2 45 f3 0f b5  |R8..v.yB.k5.E...|
+000004a0  9f 22 f9                                          |.".|
+>>> Flow 3 (client to server)
+00000000  14 03 03 00 01 01 17 03  03 00 45 4b 7c c5 9e c6  |..........EK|...|
+00000010  47 4a 90 d8 c2 c0 49 f7  3b c4 26 eb 15 18 9c bc  |GJ....I.;.&.....|
+00000020  c8 44 f0 53 94 2f 0f c8  d7 c1 86 42 ed b7 8f 63  |.D.S./.....B...c|
+00000030  a0 97 5d 5b 15 01 3a 3d  ca a6 d0 1a a4 77 cc 7e  |..][..:=.....w.~|
+00000040  88 fd 0b c9 a0 46 b7 40  25 8a 03 6e 99 66 bb 84  |.....F.@%..n.f..|
+>>> Flow 4 (server to client)
+00000000  17 03 03 00 1e 6a 41 80  ca 72 5f c3 ee e1 88 49  |.....jA..r_....I|
+00000010  6d be a4 d9 26 07 5c 2b  2c a7 83 b5 c4 eb 4e 4b  |m...&.\+,.....NK|
+00000020  a1 29 98 17 03 03 00 13  2a f9 33 6c 46 f7 9a 51  |.)......*.3lF..Q|
+00000030  1b 36 cd bc d8 5d 94 0d  9e 4b 72                 |.6...]...Kr|
diff --git a/libgo/go/crypto/tls/tls_test.go b/libgo/go/crypto/tls/tls_test.go
index 00bb6e4..208c13c 100644
--- a/libgo/go/crypto/tls/tls_test.go
+++ b/libgo/go/crypto/tls/tls_test.go
@@ -18,10 +18,22 @@ import (
 	"os"
 	"reflect"
 	"strings"
+	"sync"
 	"testing"
 	"time"
 )
 
+var savedSupportedSignatureAlgorithmsTLS12 = supportedSignatureAlgorithmsTLS12
+
+func init() {
+	// TLS 1.3 is opt-in for Go 1.12, and RSA-PSS is disabled in TLS 1.2, but we
+	// want to run most tests with both enabled. TestTLS13Switch below and the
+	// "PSS-Disabled" recordings test the disabled behavior. See Issue 30055.
+	tls13Support.Do(func() {}) // defuse the sync.Once
+	tls13Support.cached = true
+	supportedSignatureAlgorithmsTLS12 = supportedSignatureAlgorithms
+}
+
 var rsaCertPEM = `-----BEGIN CERTIFICATE-----
 MIIB0zCCAX2gAwIBAgIJAI/M7BYjwB+uMA0GCSqGSIb3DQEBBQUAMEUxCzAJBgNV
 BAYTAkFVMRMwEQYDVQQIDApTb21lLVN0YXRlMSEwHwYDVQQKDBhJbnRlcm5ldCBX
@@ -1076,18 +1088,47 @@ func TestEscapeRoute(t *testing.T) {
 		VersionSSL30,
 	}
 
-	ss, cs, err := testHandshake(t, testConfig, testConfig)
+	expectVersion(t, testConfig, testConfig, VersionTLS12)
+}
+
+func expectVersion(t *testing.T, clientConfig, serverConfig *Config, v uint16) {
+	ss, cs, err := testHandshake(t, clientConfig, serverConfig)
 	if err != nil {
-		t.Fatalf("Handshake failed when support for TLS 1.3 was dropped: %v", err)
+		t.Fatalf("Handshake failed: %v", err)
 	}
-	if ss.Version != VersionTLS12 {
-		t.Errorf("Server negotiated version %x, expected %x", cs.Version, VersionTLS12)
+	if ss.Version != v {
+		t.Errorf("Server negotiated version %x, expected %x", cs.Version, v)
 	}
-	if cs.Version != VersionTLS12 {
-		t.Errorf("Client negotiated version %x, expected %x", cs.Version, VersionTLS12)
+	if cs.Version != v {
+		t.Errorf("Client negotiated version %x, expected %x", cs.Version, v)
 	}
 }
 
+// TestTLS13Switch checks the behavior of GODEBUG=tls13=[0|1]. See Issue 30055.
+func TestTLS13Switch(t *testing.T) {
+	defer func(savedGODEBUG string) {
+		os.Setenv("GODEBUG", savedGODEBUG)
+	}(os.Getenv("GODEBUG"))
+
+	os.Setenv("GODEBUG", "tls13=0")
+	tls13Support.Once = sync.Once{} // reset the cache
+
+	tls12Config := testConfig.Clone()
+	tls12Config.MaxVersion = VersionTLS12
+	expectVersion(t, testConfig, testConfig, VersionTLS12)
+	expectVersion(t, tls12Config, testConfig, VersionTLS12)
+	expectVersion(t, testConfig, tls12Config, VersionTLS12)
+	expectVersion(t, tls12Config, tls12Config, VersionTLS12)
+
+	os.Setenv("GODEBUG", "tls13=1")
+	tls13Support.Once = sync.Once{} // reset the cache
+
+	expectVersion(t, testConfig, testConfig, VersionTLS13)
+	expectVersion(t, tls12Config, testConfig, VersionTLS12)
+	expectVersion(t, testConfig, tls12Config, VersionTLS12)
+	expectVersion(t, tls12Config, tls12Config, VersionTLS12)
+}
+
 // Issue 28744: Ensure that we don't modify memory
 // that Config doesn't own such as Certificates.
 func TestBuildNameToCertificate_doesntModifyCertificates(t *testing.T) {
diff --git a/libgo/go/crypto/x509/cert_pool.go b/libgo/go/crypto/x509/cert_pool.go
index 7c55c3b..3e1e5fb 100644
--- a/libgo/go/crypto/x509/cert_pool.go
+++ b/libgo/go/crypto/x509/cert_pool.go
@@ -71,10 +71,15 @@ func (s *CertPool) findPotentialParents(cert *Certificate) []int {
 	if s == nil {
 		return nil
 	}
+
+	var candidates []int
 	if len(cert.AuthorityKeyId) > 0 {
-		return s.bySubjectKeyId[string(cert.AuthorityKeyId)]
+		candidates = s.bySubjectKeyId[string(cert.AuthorityKeyId)]
+	}
+	if len(candidates) == 0 {
+		candidates = s.byName[string(cert.RawIssuer)]
 	}
-	return s.byName[string(cert.RawIssuer)]
+	return candidates
 }
 
 func (s *CertPool) contains(cert *Certificate) bool {
diff --git a/libgo/go/crypto/x509/verify_test.go b/libgo/go/crypto/x509/verify_test.go
index 85f4703..86fe76a 100644
--- a/libgo/go/crypto/x509/verify_test.go
+++ b/libgo/go/crypto/x509/verify_test.go
@@ -386,6 +386,19 @@ var verifyTests = []verifyTest{
 
 		errorCallback: expectHostnameError("not valid for any names"),
 	},
+	{
+		// A certificate with an AKID should still chain to a parent without SKID.
+		// See Issue 30079.
+		leaf:        leafWithAKID,
+		roots:       []string{rootWithoutSKID},
+		currentTime: 1550000000,
+		dnsName:     "example",
+		systemSkip:  true,
+
+		expectedChains: [][]string{
+			{"Acme LLC", "Acme Co"},
+		},
+	},
 }
 
 func expectHostnameError(msg string) func(*testing.T, int, error) bool {
@@ -1679,6 +1692,109 @@ h7olHCpY9yMRiz0=
 -----END CERTIFICATE-----
 `
 
+const (
+	rootWithoutSKID = `
+Certificate:
+    Data:
+        Version: 3 (0x2)
+        Serial Number:
+            78:29:2a:dc:2f:12:39:7f:c9:33:93:ea:61:39:7d:70
+        Signature Algorithm: ecdsa-with-SHA256
+        Issuer: O = Acme Co
+        Validity
+            Not Before: Feb  4 22:56:34 2019 GMT
+            Not After : Feb  1 22:56:34 2029 GMT
+        Subject: O = Acme Co
+        Subject Public Key Info:
+            Public Key Algorithm: id-ecPublicKey
+                Public-Key: (256 bit)
+                pub:
+                    04:84:a6:8c:69:53:af:87:4b:39:64:fe:04:24:e6:
+                    d8:fc:d6:46:39:35:0e:92:dc:48:08:7e:02:5f:1e:
+                    07:53:5c:d9:e0:56:c5:82:07:f6:a3:e2:ad:f6:ad:
+                    be:a0:4e:03:87:39:67:0c:9c:46:91:68:6b:0e:8e:
+                    f8:49:97:9d:5b
+                ASN1 OID: prime256v1
+                NIST CURVE: P-256
+        X509v3 extensions:
+            X509v3 Key Usage: critical
+                Digital Signature, Key Encipherment, Certificate Sign
+            X509v3 Extended Key Usage:
+                TLS Web Server Authentication
+            X509v3 Basic Constraints: critical
+                CA:TRUE
+            X509v3 Subject Alternative Name:
+                DNS:example
+    Signature Algorithm: ecdsa-with-SHA256
+         30:46:02:21:00:c6:81:61:61:42:8d:37:e7:d0:c3:72:43:44:
+         17:bd:84:ff:88:81:68:9a:99:08:ab:3c:3a:c0:1e:ea:8c:ba:
+         c0:02:21:00:de:c9:fa:e5:5e:c6:e2:db:23:64:43:a9:37:42:
+         72:92:7f:6e:89:38:ea:9e:2a:a7:fd:2f:ea:9a:ff:20:21:e7
+-----BEGIN CERTIFICATE-----
+MIIBbzCCARSgAwIBAgIQeCkq3C8SOX/JM5PqYTl9cDAKBggqhkjOPQQDAjASMRAw
+DgYDVQQKEwdBY21lIENvMB4XDTE5MDIwNDIyNTYzNFoXDTI5MDIwMTIyNTYzNFow
+EjEQMA4GA1UEChMHQWNtZSBDbzBZMBMGByqGSM49AgEGCCqGSM49AwEHA0IABISm
+jGlTr4dLOWT+BCTm2PzWRjk1DpLcSAh+Al8eB1Nc2eBWxYIH9qPirfatvqBOA4c5
+ZwycRpFoaw6O+EmXnVujTDBKMA4GA1UdDwEB/wQEAwICpDATBgNVHSUEDDAKBggr
+BgEFBQcDATAPBgNVHRMBAf8EBTADAQH/MBIGA1UdEQQLMAmCB2V4YW1wbGUwCgYI
+KoZIzj0EAwIDSQAwRgIhAMaBYWFCjTfn0MNyQ0QXvYT/iIFompkIqzw6wB7qjLrA
+AiEA3sn65V7G4tsjZEOpN0Jykn9uiTjqniqn/S/qmv8gIec=
+-----END CERTIFICATE-----
+`
+	leafWithAKID = `
+	Certificate:
+    Data:
+        Version: 3 (0x2)
+        Serial Number:
+            f0:8a:62:f0:03:84:a2:cf:69:63:ad:71:3b:b6:5d:8c
+        Signature Algorithm: ecdsa-with-SHA256
+        Issuer: O = Acme Co
+        Validity
+            Not Before: Feb  4 23:06:52 2019 GMT
+            Not After : Feb  1 23:06:52 2029 GMT
+        Subject: O = Acme LLC
+        Subject Public Key Info:
+            Public Key Algorithm: id-ecPublicKey
+                Public-Key: (256 bit)
+                pub:
+                    04:5a:4e:4d:fb:ff:17:f7:b6:13:e8:29:45:34:81:
+                    39:ff:8c:9c:d9:8c:0a:9f:dd:b5:97:4c:2b:20:91:
+                    1c:4f:6b:be:53:27:66:ec:4a:ad:08:93:6d:66:36:
+                    0c:02:70:5d:01:ca:7f:c3:29:e9:4f:00:ba:b4:14:
+                    ec:c5:c3:34:b3
+                ASN1 OID: prime256v1
+                NIST CURVE: P-256
+        X509v3 extensions:
+            X509v3 Key Usage: critical
+                Digital Signature, Key Encipherment
+            X509v3 Extended Key Usage:
+                TLS Web Server Authentication
+            X509v3 Basic Constraints: critical
+                CA:FALSE
+            X509v3 Authority Key Identifier:
+                keyid:C2:2B:5F:91:78:34:26:09:42:8D:6F:51:B2:C5:AF:4C:0B:DE:6A:42
+
+            X509v3 Subject Alternative Name:
+                DNS:example
+    Signature Algorithm: ecdsa-with-SHA256
+         30:44:02:20:64:e0:ba:56:89:63:ce:22:5e:4f:22:15:fd:3c:
+         35:64:9a:3a:6b:7b:9a:32:a0:7f:f7:69:8c:06:f0:00:58:b8:
+         02:20:09:e4:9f:6d:8b:9e:38:e1:b6:01:d5:ee:32:a4:94:65:
+         93:2a:78:94:bb:26:57:4b:c7:dd:6c:3d:40:2b:63:90
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
+`
+)
+
 var unknownAuthorityErrorTests = []struct {
 	cert     string
 	expected string
diff --git a/libgo/go/crypto/x509/x509.go b/libgo/go/crypto/x509/x509.go
index 08681a6..58098ad 100644
--- a/libgo/go/crypto/x509/x509.go
+++ b/libgo/go/crypto/x509/x509.go
@@ -2272,21 +2272,25 @@ type CertificateRequest struct {
 
 	Subject pkix.Name
 
-	// Attributes is the dried husk of a bug and shouldn't be used.
+	// Attributes contains the CSR attributes that can parse as
+	// pkix.AttributeTypeAndValueSET.
+	//
+	// Deprecated: use Extensions and ExtraExtensions instead for parsing and
+	// generating the requestedExtensions attribute.
 	Attributes []pkix.AttributeTypeAndValueSET
 
-	// Extensions contains raw X.509 extensions. When parsing CSRs, this
-	// can be used to extract extensions that are not parsed by this
+	// Extensions contains all requested extensions, in raw form. When parsing
+	// CSRs, this can be used to extract extensions that are not parsed by this
 	// package.
 	Extensions []pkix.Extension
 
-	// ExtraExtensions contains extensions to be copied, raw, into any
-	// marshaled CSR. Values override any extensions that would otherwise
-	// be produced based on the other fields but are overridden by any
-	// extensions specified in Attributes.
+	// ExtraExtensions contains extensions to be copied, raw, into any CSR
+	// marshaled by CreateCertificateRequest. Values override any extensions
+	// that would otherwise be produced based on the other fields but are
+	// overridden by any extensions specified in Attributes.
 	//
-	// The ExtraExtensions field is not populated when parsing CSRs, see
-	// Extensions.
+	// The ExtraExtensions field is not populated by ParseCertificateRequest,
+	// see Extensions instead.
 	ExtraExtensions []pkix.Extension
 
 	// Subject Alternate Name values.
@@ -2385,21 +2389,21 @@ func parseCSRExtensions(rawAttributes []asn1.RawValue) ([]pkix.Extension, error)
 // CreateCertificateRequest creates a new certificate request based on a
 // template. The following members of template are used:
 //
-//  - Attributes
+//  - SignatureAlgorithm
+//  - Subject
 //  - DNSNames
 //  - EmailAddresses
-//  - ExtraExtensions
 //  - IPAddresses
 //  - URIs
-//  - SignatureAlgorithm
-//  - Subject
+//  - ExtraExtensions
+//  - Attributes (deprecated)
 //
-// The private key is the private key of the signer.
+// priv is the private key to sign the CSR with, and the corresponding public
+// key will be included in the CSR. It must implement crypto.Signer and its
+// Public() method must return a *rsa.PublicKey or a *ecdsa.PublicKey. (A
+// *rsa.PrivateKey or *ecdsa.PrivateKey satisfies this.)
 //
 // The returned slice is the certificate request in DER encoding.
-//
-// All keys types that are implemented via crypto.Signer are supported (This
-// includes *rsa.PublicKey and *ecdsa.PublicKey.)
 func CreateCertificateRequest(rand io.Reader, template *CertificateRequest, priv interface{}) (csr []byte, err error) {
 	key, ok := priv.(crypto.Signer)
 	if !ok {
diff --git a/libgo/go/database/sql/sql.go b/libgo/go/database/sql/sql.go
index b0353ab..8cdc903 100644
--- a/libgo/go/database/sql/sql.go
+++ b/libgo/go/database/sql/sql.go
@@ -1698,7 +1698,7 @@ func (db *DB) Conn(ctx context.Context) (*Conn, error) {
 		}
 	}
 	if err == driver.ErrBadConn {
-		dc, err = db.conn(ctx, cachedOrNewConn)
+		dc, err = db.conn(ctx, alwaysNewConn)
 	}
 	if err != nil {
 		return nil, err
@@ -2256,6 +2256,13 @@ var (
 
 // Stmt is a prepared statement.
 // A Stmt is safe for concurrent use by multiple goroutines.
+//
+// If a Stmt is prepared on a Tx or Conn, it will be bound to a single
+// underlying connection forever. If the Tx or Conn closes, the Stmt will
+// become unusable and all operations will return an error.
+// If a Stmt is prepared on a DB, it will remain usable for the lifetime of the
+// DB. When the Stmt needs to execute on a new underlying connection, it will
+// prepare itself on the new connection automatically.
 type Stmt struct {
 	// Immutable:
 	db        *DB    // where we came from
diff --git a/libgo/go/encoding/json/encode.go b/libgo/go/encoding/json/encode.go
index f10124e..dea63f1 100644
--- a/libgo/go/encoding/json/encode.go
+++ b/libgo/go/encoding/json/encode.go
@@ -259,6 +259,7 @@ func (e *InvalidUTF8Error) Error() string {
 	return "json: invalid UTF-8 in string: " + strconv.Quote(e.S)
 }
 
+// A MarshalerError represents an error from calling a MarshalJSON or MarshalText method.
 type MarshalerError struct {
 	Type reflect.Type
 	Err  error
diff --git a/libgo/go/flag/flag.go b/libgo/go/flag/flag.go
index 2eef9d6..c312c62 100644
--- a/libgo/go/flag/flag.go
+++ b/libgo/go/flag/flag.go
@@ -548,6 +548,8 @@ func (f *FlagSet) PrintDefaults() {
 // the output will be
 //	-I directory
 //		search directory for include files.
+//
+// To change the destination for flag messages, call CommandLine.SetOutput.
 func PrintDefaults() {
 	CommandLine.PrintDefaults()
 }
diff --git a/libgo/go/math/big/ratconv.go b/libgo/go/math/big/ratconv.go
index 157d8d0..5656280 100644
--- a/libgo/go/math/big/ratconv.go
+++ b/libgo/go/math/big/ratconv.go
@@ -38,8 +38,8 @@ func (z *Rat) Scan(s fmt.ScanState, ch rune) error {
 }
 
 // SetString sets z to the value of s and returns z and a boolean indicating
-// success. s can be given as a fraction "a/b" or as a floating-point number
-// optionally followed by an exponent. The entire string (not just a prefix)
+// success. s can be given as a fraction "a/b" or as a decimal floating-point
+// number optionally followed by an exponent. The entire string (not just a prefix)
 // must be valid for success. If the operation failed, the value of z is
 // undefined but the returned value is nil.
 func (z *Rat) SetString(s string) (*Rat, bool) {
@@ -78,6 +78,7 @@ func (z *Rat) SetString(s string) (*Rat, bool) {
 	}
 
 	// mantissa
+	// TODO(gri) allow other bases besides 10 for mantissa and exponent? (issue #29799)
 	var ecorr int
 	z.a.abs, _, ecorr, err = z.a.abs.scan(r, 10, true)
 	if err != nil {
diff --git a/libgo/go/net/http/client.go b/libgo/go/net/http/client.go
index ea6c0719..921f86b 100644
--- a/libgo/go/net/http/client.go
+++ b/libgo/go/net/http/client.go
@@ -478,10 +478,10 @@ func urlErrorOp(method string) string {
 // error.
 //
 // If the returned error is nil, the Response will contain a non-nil
-// Body which the user is expected to close. If the Body is not
-// closed, the Client's underlying RoundTripper (typically Transport)
-// may not be able to re-use a persistent TCP connection to the server
-// for a subsequent "keep-alive" request.
+// Body which the user is expected to close. If the Body is not both
+// read to EOF and closed, the Client's underlying RoundTripper
+// (typically Transport) may not be able to re-use a persistent TCP
+// connection to the server for a subsequent "keep-alive" request.
 //
 // The request Body, if non-nil, will be closed by the underlying
 // Transport, even on errors.
diff --git a/libgo/go/net/http/fs_test.go b/libgo/go/net/http/fs_test.go
index 1d6380d..82e13a4 100644
--- a/libgo/go/net/http/fs_test.go
+++ b/libgo/go/net/http/fs_test.go
@@ -583,16 +583,23 @@ func TestFileServerZeroByte(t *testing.T) {
 	ts := httptest.NewServer(FileServer(Dir(".")))
 	defer ts.Close()
 
-	res, err := Get(ts.URL + "/..\x00")
+	c, err := net.Dial("tcp", ts.Listener.Addr().String())
 	if err != nil {
 		t.Fatal(err)
 	}
-	b, err := ioutil.ReadAll(res.Body)
+	defer c.Close()
+	_, err = fmt.Fprintf(c, "GET /..\x00 HTTP/1.0\r\n\r\n")
+	if err != nil {
+		t.Fatal(err)
+	}
+	var got bytes.Buffer
+	bufr := bufio.NewReader(io.TeeReader(c, &got))
+	res, err := ReadResponse(bufr, nil)
 	if err != nil {
-		t.Fatal("reading Body:", err)
+		t.Fatal("ReadResponse: ", err)
 	}
 	if res.StatusCode == 200 {
-		t.Errorf("got status 200; want an error. Body is:\n%s", string(b))
+		t.Errorf("got status 200; want an error. Body is:\n%s", got.Bytes())
 	}
 }
 
diff --git a/libgo/go/net/http/h2_bundle.go b/libgo/go/net/http/h2_bundle.go
index 77c7eee..a848d68 100644
--- a/libgo/go/net/http/h2_bundle.go
+++ b/libgo/go/net/http/h2_bundle.go
@@ -4852,7 +4852,7 @@ func (sc *http2serverConn) resetStream(se http2StreamError) {
 
 // processFrameFromReader processes the serve loop's read from readFrameCh from the
 // frame-reading goroutine.
-// processFrameFromReader reports whether the connection should be kept open.
+// processFrameFromReader returns whether the connection should be kept open.
 func (sc *http2serverConn) processFrameFromReader(res http2readFrameResult) bool {
 	sc.serveG.check()
 	err := res.err
@@ -5157,12 +5157,6 @@ func (sc *http2serverConn) processData(f *http2DataFrame) error {
 		// type PROTOCOL_ERROR."
 		return http2ConnectionError(http2ErrCodeProtocol)
 	}
-	// RFC 7540, sec 6.1: If a DATA frame is received whose stream is not in
-	// "open" or "half-closed (local)" state, the recipient MUST respond with a
-	// stream error (Section 5.4.2) of type STREAM_CLOSED.
-	if state == http2stateClosed {
-		return http2streamError(id, http2ErrCodeStreamClosed)
-	}
 	if st == nil || state != http2stateOpen || st.gotTrailerHeader || st.resetQueued {
 		// This includes sending a RST_STREAM if the stream is
 		// in stateHalfClosedLocal (which currently means that
diff --git a/libgo/go/net/http/http.go b/libgo/go/net/http/http.go
index 624b2cf..e5d59e1 100644
--- a/libgo/go/net/http/http.go
+++ b/libgo/go/net/http/http.go
@@ -59,6 +59,17 @@ func isASCII(s string) bool {
 	return true
 }
 
+// stringContainsCTLByte reports whether s contains any ASCII control character.
+func stringContainsCTLByte(s string) bool {
+	for i := 0; i < len(s); i++ {
+		b := s[i]
+		if b < ' ' || b == 0x7f {
+			return true
+		}
+	}
+	return false
+}
+
 func hexEscapeNonASCII(s string) string {
 	newLen := 0
 	for i := 0; i < len(s); i++ {
diff --git a/libgo/go/net/http/request.go b/libgo/go/net/http/request.go
index fb058f9..dcad2b6 100644
--- a/libgo/go/net/http/request.go
+++ b/libgo/go/net/http/request.go
@@ -550,7 +550,12 @@ func (r *Request) write(w io.Writer, usingProxy bool, extraHeaders Header, waitF
 			ruri = r.URL.Opaque
 		}
 	}
-	// TODO(bradfitz): escape at least newlines in ruri?
+	if stringContainsCTLByte(ruri) {
+		return errors.New("net/http: can't write control character in Request.URL")
+	}
+	// TODO: validate r.Method too? At least it's less likely to
+	// come from an attacker (more likely to be a constant in
+	// code).
 
 	// Wrap the writer in a bufio Writer if it's not already buffered.
 	// Don't always call NewWriter, as that forces a bytes.Buffer
diff --git a/libgo/go/net/http/requestwrite_test.go b/libgo/go/net/http/requestwrite_test.go
index 7dbf0d4..b110b57 100644
--- a/libgo/go/net/http/requestwrite_test.go
+++ b/libgo/go/net/http/requestwrite_test.go
@@ -576,6 +576,17 @@ var reqWriteTests = []reqWriteTest{
 			"User-Agent: Go-http-client/1.1\r\n" +
 			"X-Foo: X-Bar\r\n\r\n",
 	},
+
+	25: {
+		Req: Request{
+			Method: "GET",
+			URL: &url.URL{
+				Host:     "www.example.com",
+				RawQuery: "new\nline", // or any CTL
+			},
+		},
+		WantError: errors.New("net/http: can't write control character in Request.URL"),
+	},
 }
 
 func TestRequestWrite(t *testing.T) {
diff --git a/libgo/go/net/lookup_test.go b/libgo/go/net/lookup_test.go
index 1da0e49..85bcb2b 100644
--- a/libgo/go/net/lookup_test.go
+++ b/libgo/go/net/lookup_test.go
@@ -207,6 +207,9 @@ var lookupGmailTXTTests = []struct {
 }
 
 func TestLookupGmailTXT(t *testing.T) {
+	if runtime.GOOS == "plan9" {
+		t.Skip("skipping on plan9; see https://golang.org/issue/29722")
+	}
 	t.Parallel()
 	mustHaveExternalNetwork(t)
 
@@ -237,11 +240,16 @@ func TestLookupGmailTXT(t *testing.T) {
 		if len(txts) == 0 {
 			t.Error("got no record")
 		}
+		found := false
 		for _, txt := range txts {
-			if !strings.Contains(txt, tt.txt) || (!strings.HasSuffix(txt, tt.host) && !strings.HasSuffix(txt, tt.host+".")) {
-				t.Errorf("got %s; want a record containing %s, %s", txt, tt.txt, tt.host)
+			if strings.Contains(txt, tt.txt) && (strings.HasSuffix(txt, tt.host) || strings.HasSuffix(txt, tt.host+".")) {
+				found = true
+				break
 			}
 		}
+		if !found {
+			t.Errorf("got %v; want a record containing %s, %s", txts, tt.txt, tt.host)
+		}
 	}
 }
 
diff --git a/libgo/go/net/net_test.go b/libgo/go/net/net_test.go
index 692f269..2b5845b 100644
--- a/libgo/go/net/net_test.go
+++ b/libgo/go/net/net_test.go
@@ -529,7 +529,7 @@ func TestNotTemporaryRead(t *testing.T) {
 	server := func(cs *TCPConn) error {
 		cs.SetLinger(0)
 		// Give the client time to get stuck in a Read.
-		time.Sleep(20 * time.Millisecond)
+		time.Sleep(50 * time.Millisecond)
 		cs.Close()
 		return nil
 	}
diff --git a/libgo/go/net/url/url.go b/libgo/go/net/url/url.go
index d84c95a..64274a0 100644
--- a/libgo/go/net/url/url.go
+++ b/libgo/go/net/url/url.go
@@ -513,6 +513,10 @@ func parse(rawurl string, viaRequest bool) (*URL, error) {
 	var rest string
 	var err error
 
+	if stringContainsCTLByte(rawurl) {
+		return nil, errors.New("net/url: invalid control character in URL")
+	}
+
 	if rawurl == "" && viaRequest {
 		return nil, errors.New("empty url")
 	}
@@ -1134,3 +1138,14 @@ func validUserinfo(s string) bool {
 	}
 	return true
 }
+
+// stringContainsCTLByte reports whether s contains any ASCII control character.
+func stringContainsCTLByte(s string) bool {
+	for i := 0; i < len(s); i++ {
+		b := s[i]
+		if b < ' ' || b == 0x7f {
+			return true
+		}
+	}
+	return false
+}
diff --git a/libgo/go/net/url/url_test.go b/libgo/go/net/url/url_test.go
index 7c4ada2..c5fc90d 100644
--- a/libgo/go/net/url/url_test.go
+++ b/libgo/go/net/url/url_test.go
@@ -1738,12 +1738,33 @@ func TestNilUser(t *testing.T) {
 }
 
 func TestInvalidUserPassword(t *testing.T) {
-	_, err := Parse("http://us\ner:pass\nword@foo.com/")
+	_, err := Parse("http://user^:passwo^rd@foo.com/")
 	if got, wantsub := fmt.Sprint(err), "net/url: invalid userinfo"; !strings.Contains(got, wantsub) {
 		t.Errorf("error = %q; want substring %q", got, wantsub)
 	}
 }
 
+func TestRejectControlCharacters(t *testing.T) {
+	tests := []string{
+		"http://foo.com/?foo\nbar",
+		"http\r://foo.com/",
+		"http://foo\x7f.com/",
+	}
+	for _, s := range tests {
+		_, err := Parse(s)
+		const wantSub = "net/url: invalid control character in URL"
+		if got := fmt.Sprint(err); !strings.Contains(got, wantSub) {
+			t.Errorf("Parse(%q) error = %q; want substring %q", s, got, wantSub)
+		}
+	}
+
+	// But don't reject non-ASCII CTLs, at least for now:
+	if _, err := Parse("http://foo.com/ctl\x80"); err != nil {
+		t.Errorf("error parsing URL with non-ASCII control byte: %v", err)
+	}
+
+}
+
 var escapeBenchmarks = []struct {
 	unescaped string
 	query     string
diff --git a/libgo/go/os/file_unix.go b/libgo/go/os/file_unix.go
index 5f7ab30..912ba5a 100644
--- a/libgo/go/os/file_unix.go
+++ b/libgo/go/os/file_unix.go
@@ -192,6 +192,7 @@ func epipecheck(file *File, e error) {
 const DevNull = "/dev/null"
 
 // openFileNolog is the Unix implementation of OpenFile.
+// Changes here should be reflected in openFdAt, if relevant.
 func openFileNolog(name string, flag int, perm FileMode) (*File, error) {
 	setSticky := false
 	if !supportsCreateWithStickyBit && flag&O_CREATE != 0 && perm&ModeSticky != 0 {
diff --git a/libgo/go/os/path.go b/libgo/go/os/path.go
index 30cc6c8..104b7ce 100644
--- a/libgo/go/os/path.go
+++ b/libgo/go/os/path.go
@@ -58,6 +58,14 @@ func MkdirAll(path string, perm FileMode) error {
 	return nil
 }
 
+// RemoveAll removes path and any children it contains.
+// It removes everything it can but returns the first error
+// it encounters. If the path does not exist, RemoveAll
+// returns nil (no error).
+func RemoveAll(path string) error {
+	return removeAll(path)
+}
+
 // endsWithDot reports whether the final component of path is ".".
 func endsWithDot(path string) bool {
 	if path == "." {
diff --git a/libgo/go/os/removeall_at.go b/libgo/go/os/removeall_at.go
index 5128de7..d1210ee 100644
--- a/libgo/go/os/removeall_at.go
+++ b/libgo/go/os/removeall_at.go
@@ -9,10 +9,11 @@ package os
 import (
 	"internal/syscall/unix"
 	"io"
+	"runtime"
 	"syscall"
 )
 
-func RemoveAll(path string) error {
+func removeAll(path string) error {
 	if path == "" {
 		// fail silently to retain compatibility with previous behavior
 		// of RemoveAll. See issue 28830.
@@ -56,8 +57,13 @@ func removeAllFrom(parent *File, path string) error {
 		return nil
 	}
 
-	// If not a "is directory" error, we have a problem
-	if err != syscall.EISDIR && err != syscall.EPERM {
+	// EISDIR means that we have a directory, and we need to
+	// remove its contents.
+	// EPERM or EACCES means that we don't have write permission on
+	// the parent directory, but this entry might still be a directory
+	// whose contents need to be removed.
+	// Otherwise just return the error.
+	if err != syscall.EISDIR && err != syscall.EPERM && err != syscall.EACCES {
 		return err
 	}
 
@@ -68,11 +74,11 @@ func removeAllFrom(parent *File, path string) error {
 		return statErr
 	}
 	if statInfo.Mode&syscall.S_IFMT != syscall.S_IFDIR {
-		// Not a directory; return the error from the Remove
+		// Not a directory; return the error from the Remove.
 		return err
 	}
 
-	// Remove the directory's entries
+	// Remove the directory's entries.
 	var recurseErr error
 	for {
 		const request = 1024
@@ -87,7 +93,7 @@ func removeAllFrom(parent *File, path string) error {
 		}
 
 		names, readErr := file.Readdirnames(request)
-		// Errors other than EOF should stop us from continuing
+		// Errors other than EOF should stop us from continuing.
 		if readErr != nil && readErr != io.EOF {
 			file.Close()
 			if IsNotExist(readErr) {
@@ -116,7 +122,7 @@ func removeAllFrom(parent *File, path string) error {
 		}
 	}
 
-	// Remove the directory itself
+	// Remove the directory itself.
 	unlinkError := unix.Unlinkat(parentFd, path, unix.AT_REMOVEDIR)
 	if unlinkError == nil || IsNotExist(unlinkError) {
 		return nil
@@ -128,11 +134,31 @@ func removeAllFrom(parent *File, path string) error {
 	return unlinkError
 }
 
-func openFdAt(fd int, path string) (*File, error) {
-	fd, err := unix.Openat(fd, path, O_RDONLY, 0)
-	if err != nil {
-		return nil, err
+// openFdAt opens path relative to the directory in fd.
+// Other than that this should act like openFileNolog.
+// This acts like openFileNolog rather than OpenFile because
+// we are going to (try to) remove the file.
+// The contents of this file are not relevant for test caching.
+func openFdAt(dirfd int, name string) (*File, error) {
+	var r int
+	for {
+		var e error
+		r, e = unix.Openat(dirfd, name, O_RDONLY, 0)
+		if e == nil {
+			break
+		}
+
+		// See comment in openFileNolog.
+		if runtime.GOOS == "darwin" && e == syscall.EINTR {
+			continue
+		}
+
+		return nil, &PathError{"openat", name, e}
+	}
+
+	if !supportsCloseOnExec {
+		syscall.CloseOnExec(r)
 	}
 
-	return NewFile(uintptr(fd), path), nil
+	return newFile(uintptr(r), name, kindOpenFile), nil
 }
diff --git a/libgo/go/os/removeall_noat.go b/libgo/go/os/removeall_noat.go
index 47fff42..7d9f73e 100644
--- a/libgo/go/os/removeall_noat.go
+++ b/libgo/go/os/removeall_noat.go
@@ -11,11 +11,7 @@ import (
 	"syscall"
 )
 
-// RemoveAll removes path and any children it contains.
-// It removes everything it can but returns the first error
-// it encounters. If the path does not exist, RemoveAll
-// returns nil (no error).
-func RemoveAll(path string) error {
+func removeAll(path string) error {
 	if path == "" {
 		// fail silently to retain compatibility with previous behavior
 		// of RemoveAll. See issue 28830.
diff --git a/libgo/go/os/removeall_test.go b/libgo/go/os/removeall_test.go
index 0f7dce0..9dab0d4 100644
--- a/libgo/go/os/removeall_test.go
+++ b/libgo/go/os/removeall_test.go
@@ -292,3 +292,83 @@ func TestRemoveReadOnlyDir(t *testing.T) {
 		t.Error("subdirectory was not removed")
 	}
 }
+
+// Issue #29983.
+func TestRemoveAllButReadOnly(t *testing.T) {
+	switch runtime.GOOS {
+	case "nacl", "js", "windows":
+		t.Skipf("skipping test on %s", runtime.GOOS)
+	}
+
+	if Getuid() == 0 {
+		t.Skip("skipping test when running as root")
+	}
+
+	t.Parallel()
+
+	tempDir, err := ioutil.TempDir("", "TestRemoveAllButReadOnly-")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer RemoveAll(tempDir)
+
+	dirs := []string{
+		"a",
+		"a/x",
+		"a/x/1",
+		"b",
+		"b/y",
+		"b/y/2",
+		"c",
+		"c/z",
+		"c/z/3",
+	}
+	readonly := []string{
+		"b",
+	}
+	inReadonly := func(d string) bool {
+		for _, ro := range readonly {
+			if d == ro {
+				return true
+			}
+			dd, _ := filepath.Split(d)
+			if filepath.Clean(dd) == ro {
+				return true
+			}
+		}
+		return false
+	}
+
+	for _, dir := range dirs {
+		if err := Mkdir(filepath.Join(tempDir, dir), 0777); err != nil {
+			t.Fatal(err)
+		}
+	}
+	for _, dir := range readonly {
+		d := filepath.Join(tempDir, dir)
+		if err := Chmod(d, 0555); err != nil {
+			t.Fatal(err)
+		}
+
+		// Defer changing the mode back so that the deferred
+		// RemoveAll(tempDir) can succeed.
+		defer Chmod(d, 0777)
+	}
+
+	if err := RemoveAll(tempDir); err == nil {
+		t.Fatal("RemoveAll succeeded unexpectedly")
+	}
+
+	for _, dir := range dirs {
+		_, err := Stat(filepath.Join(tempDir, dir))
+		if inReadonly(dir) {
+			if err != nil {
+				t.Errorf("file %q was deleted but should still exist", dir)
+			}
+		} else {
+			if err == nil {
+				t.Errorf("file %q still exists but should have been deleted", dir)
+			}
+		}
+	}
+}
diff --git a/libgo/go/path/filepath/path_test.go b/libgo/go/path/filepath/path_test.go
index 4840f9d..deeb47e 100644
--- a/libgo/go/path/filepath/path_test.go
+++ b/libgo/go/path/filepath/path_test.go
@@ -1378,13 +1378,27 @@ func TestWalkSymlink(t *testing.T) {
 }
 
 func TestIssue29372(t *testing.T) {
-	f, err := ioutil.TempFile("", "issue29372")
+	tmpDir, err := ioutil.TempDir("", "TestIssue29372")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	if runtime.GOOS == "windows" {
+		// This test is broken on windows, if temporary directory
+		// is a symlink. See issue 29746.
+		// TODO(brainman): Remove this hack once issue #29746 is fixed.
+		tmpDir, err = filepath.EvalSymlinks(tmpDir)
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	path := filepath.Join(tmpDir, "file.txt")
+	err = ioutil.WriteFile(path, nil, 0644)
 	if err != nil {
 		t.Fatal(err)
 	}
-	f.Close()
-	path := f.Name()
-	defer os.Remove(path)
 
 	pathSeparator := string(filepath.Separator)
 	tests := []string{
diff --git a/libgo/go/runtime/malloc.go b/libgo/go/runtime/malloc.go
index 36417fb..d2d86995 100644
--- a/libgo/go/runtime/malloc.go
+++ b/libgo/go/runtime/malloc.go
@@ -1029,7 +1029,7 @@ func mallocgc(size uintptr, typ *_type, needzero bool) unsafe.Pointer {
 	}
 
 	if rate := MemProfileRate; rate > 0 {
-		if size < uintptr(rate) && int32(size) < c.next_sample {
+		if rate != 1 && int32(size) < c.next_sample {
 			c.next_sample -= int32(size)
 		} else {
 			mp := acquirem()
diff --git a/libgo/go/runtime/mheap.go b/libgo/go/runtime/mheap.go
index 7139b0e..2332a2e 100644
--- a/libgo/go/runtime/mheap.go
+++ b/libgo/go/runtime/mheap.go
@@ -107,6 +107,14 @@ type mheap struct {
 	// This is accessed atomically.
 	reclaimCredit uintptr
 
+	// scavengeCredit is spare credit for extra bytes scavenged.
+	// Since the scavenging mechanisms operate on spans, it may
+	// scavenge more than requested. Any spare pages released
+	// go to this credit pool.
+	//
+	// This is protected by the mheap lock.
+	scavengeCredit uintptr
+
 	// Malloc stats.
 	largealloc  uint64                  // bytes allocated for large objects
 	nlargealloc uint64                  // number of large object allocations
@@ -165,7 +173,7 @@ type mheap struct {
 	// simply blocking GC (by disabling preemption).
 	sweepArenas []arenaIdx
 
-	_ uint32 // ensure 64-bit alignment of central
+	// _ uint32 // ensure 64-bit alignment of central
 
 	// central free lists for small size classes.
 	// the padding makes sure that the mcentrals are
@@ -419,6 +427,115 @@ func (s *mspan) physPageBounds() (uintptr, uintptr) {
 	return start, end
 }
 
+func (h *mheap) coalesce(s *mspan) {
+	// We scavenge s at the end after coalescing if s or anything
+	// it merged with is marked scavenged.
+	needsScavenge := false
+	prescavenged := s.released() // number of bytes already scavenged.
+
+	// merge is a helper which merges other into s, deletes references to other
+	// in heap metadata, and then discards it. other must be adjacent to s.
+	merge := func(other *mspan) {
+		// Adjust s via base and npages and also in heap metadata.
+		s.npages += other.npages
+		s.needzero |= other.needzero
+		if other.startAddr < s.startAddr {
+			s.startAddr = other.startAddr
+			h.setSpan(s.base(), s)
+		} else {
+			h.setSpan(s.base()+s.npages*pageSize-1, s)
+		}
+
+		// If before or s are scavenged, then we need to scavenge the final coalesced span.
+		needsScavenge = needsScavenge || other.scavenged || s.scavenged
+		prescavenged += other.released()
+
+		// The size is potentially changing so the treap needs to delete adjacent nodes and
+		// insert back as a combined node.
+		if other.scavenged {
+			h.scav.removeSpan(other)
+		} else {
+			h.free.removeSpan(other)
+		}
+		other.state = mSpanDead
+		h.spanalloc.free(unsafe.Pointer(other))
+	}
+
+	// realign is a helper which shrinks other and grows s such that their
+	// boundary is on a physical page boundary.
+	realign := func(a, b, other *mspan) {
+		// Caller must ensure a.startAddr < b.startAddr and that either a or
+		// b is s. a and b must be adjacent. other is whichever of the two is
+		// not s.
+
+		// If pageSize <= physPageSize then spans are always aligned
+		// to physical page boundaries, so just exit.
+		if pageSize <= physPageSize {
+			return
+		}
+		// Since we're resizing other, we must remove it from the treap.
+		if other.scavenged {
+			h.scav.removeSpan(other)
+		} else {
+			h.free.removeSpan(other)
+		}
+		// Round boundary to the nearest physical page size, toward the
+		// scavenged span.
+		boundary := b.startAddr
+		if a.scavenged {
+			boundary &^= (physPageSize - 1)
+		} else {
+			boundary = (boundary + physPageSize - 1) &^ (physPageSize - 1)
+		}
+		a.npages = (boundary - a.startAddr) / pageSize
+		b.npages = (b.startAddr + b.npages*pageSize - boundary) / pageSize
+		b.startAddr = boundary
+
+		h.setSpan(boundary-1, a)
+		h.setSpan(boundary, b)
+
+		// Re-insert other now that it has a new size.
+		if other.scavenged {
+			h.scav.insert(other)
+		} else {
+			h.free.insert(other)
+		}
+	}
+
+	// Coalesce with earlier, later spans.
+	if before := spanOf(s.base() - 1); before != nil && before.state == mSpanFree {
+		if s.scavenged == before.scavenged {
+			merge(before)
+		} else {
+			realign(before, s, before)
+		}
+	}
+
+	// Now check to see if next (greater addresses) span is free and can be coalesced.
+	if after := spanOf(s.base() + s.npages*pageSize); after != nil && after.state == mSpanFree {
+		if s.scavenged == after.scavenged {
+			merge(after)
+		} else {
+			realign(s, after, after)
+		}
+	}
+
+	if needsScavenge {
+		// When coalescing spans, some physical pages which
+		// were not returned to the OS previously because
+		// they were only partially covered by the span suddenly
+		// become available for scavenging. We want to make sure
+		// those holes are filled in, and the span is properly
+		// scavenged. Rather than trying to detect those holes
+		// directly, we collect how many bytes were already
+		// scavenged above and subtract that from heap_released
+		// before re-scavenging the entire newly-coalesced span,
+		// which will implicitly bump up heap_released.
+		memstats.heap_released -= uint64(prescavenged)
+		s.scavenge()
+	}
+}
+
 func (s *mspan) scavenge() uintptr {
 	// start and end must be rounded in, otherwise madvise
 	// will round them *out* and release more memory
@@ -1081,6 +1198,16 @@ HaveSpan:
 		// heap_released since we already did so earlier.
 		sysUsed(unsafe.Pointer(s.base()), s.npages<<_PageShift)
 		s.scavenged = false
+
+		// Since we allocated out of a scavenged span, we just
+		// grew the RSS. Mitigate this by scavenging enough free
+		// space to make up for it.
+		//
+		// Also, scavengeLargest may cause coalescing, so prevent
+		// coalescing with s by temporarily changing its state.
+		s.state = mSpanManual
+		h.scavengeLargest(s.npages * pageSize)
+		s.state = mSpanFree
 	}
 	s.unusedsince = 0
 
@@ -1215,62 +1342,8 @@ func (h *mheap) freeSpanLocked(s *mspan, acctinuse, acctidle bool, unusedsince i
 		s.unusedsince = nanotime()
 	}
 
-	// We scavenge s at the end after coalescing if s or anything
-	// it merged with is marked scavenged.
-	needsScavenge := false
-	prescavenged := s.released() // number of bytes already scavenged.
-
-	// Coalesce with earlier, later spans.
-	if before := spanOf(s.base() - 1); before != nil && before.state == mSpanFree {
-		// Now adjust s.
-		s.startAddr = before.startAddr
-		s.npages += before.npages
-		s.needzero |= before.needzero
-		h.setSpan(before.base(), s)
-		// If before or s are scavenged, then we need to scavenge the final coalesced span.
-		needsScavenge = needsScavenge || before.scavenged || s.scavenged
-		prescavenged += before.released()
-		// The size is potentially changing so the treap needs to delete adjacent nodes and
-		// insert back as a combined node.
-		if before.scavenged {
-			h.scav.removeSpan(before)
-		} else {
-			h.free.removeSpan(before)
-		}
-		before.state = mSpanDead
-		h.spanalloc.free(unsafe.Pointer(before))
-	}
-
-	// Now check to see if next (greater addresses) span is free and can be coalesced.
-	if after := spanOf(s.base() + s.npages*pageSize); after != nil && after.state == mSpanFree {
-		s.npages += after.npages
-		s.needzero |= after.needzero
-		h.setSpan(s.base()+s.npages*pageSize-1, s)
-		needsScavenge = needsScavenge || after.scavenged || s.scavenged
-		prescavenged += after.released()
-		if after.scavenged {
-			h.scav.removeSpan(after)
-		} else {
-			h.free.removeSpan(after)
-		}
-		after.state = mSpanDead
-		h.spanalloc.free(unsafe.Pointer(after))
-	}
-
-	if needsScavenge {
-		// When coalescing spans, some physical pages which
-		// were not returned to the OS previously because
-		// they were only partially covered by the span suddenly
-		// become available for scavenging. We want to make sure
-		// those holes are filled in, and the span is properly
-		// scavenged. Rather than trying to detect those holes
-		// directly, we collect how many bytes were already
-		// scavenged above and subtract that from heap_released
-		// before re-scavenging the entire newly-coalesced span,
-		// which will implicitly bump up heap_released.
-		memstats.heap_released -= uint64(prescavenged)
-		s.scavenge()
-	}
+	// Coalesce span with neighbors.
+	h.coalesce(s)
 
 	// Insert s into the appropriate treap.
 	if s.scavenged {
@@ -1284,6 +1357,14 @@ func (h *mheap) freeSpanLocked(s *mspan, acctinuse, acctidle bool, unusedsince i
 // starting from the largest span and working down. It then takes those spans
 // and places them in scav. h must be locked.
 func (h *mheap) scavengeLargest(nbytes uintptr) {
+	// Use up scavenge credit if there's any available.
+	if nbytes > h.scavengeCredit {
+		nbytes -= h.scavengeCredit
+		h.scavengeCredit = 0
+	} else {
+		h.scavengeCredit -= nbytes
+		return
+	}
 	// Iterate over the treap backwards (from largest to smallest) scavenging spans
 	// until we've reached our quota of nbytes.
 	released := uintptr(0)
@@ -1304,10 +1385,18 @@ func (h *mheap) scavengeLargest(nbytes uintptr) {
 		}
 		n := t.prev()
 		h.free.erase(t)
+		// Now that s is scavenged, we must eagerly coalesce it
+		// with its neighbors to prevent having two spans with
+		// the same scavenged state adjacent to each other.
+		h.coalesce(s)
 		t = n
 		h.scav.insert(s)
 		released += r
 	}
+	// If we over-scavenged, turn that extra amount into credit.
+	if released > nbytes {
+		h.scavengeCredit += released - nbytes
+	}
 }
 
 // scavengeAll visits each node in the unscav treap and scavenges the
@@ -1323,6 +1412,10 @@ func (h *mheap) scavengeAll(now, limit uint64) uintptr {
 			r := s.scavenge()
 			if r != 0 {
 				h.free.erase(t)
+				// Now that s is scavenged, we must eagerly coalesce it
+				// with its neighbors to prevent having two spans with
+				// the same scavenged state adjacent to each other.
+				h.coalesce(s)
 				h.scav.insert(s)
 				released += r
 			}
diff --git a/libgo/go/runtime/testdata/testprog/memprof.go b/libgo/go/runtime/testdata/testprog/memprof.go
index a22fee6..7b134bc 100644
--- a/libgo/go/runtime/testdata/testprog/memprof.go
+++ b/libgo/go/runtime/testdata/testprog/memprof.go
@@ -21,7 +21,10 @@ var memProfBuf bytes.Buffer
 var memProfStr string
 
 func MemProf() {
-	for i := 0; i < 1000; i++ {
+	// Force heap sampling for determinism.
+	runtime.MemProfileRate = 1
+
+	for i := 0; i < 10; i++ {
 		fmt.Fprintf(&memProfBuf, "%*d\n", i, i)
 	}
 	memProfStr = memProfBuf.String()
diff --git a/libgo/go/sort/sort.go b/libgo/go/sort/sort.go
index 7282b26..dd5bb37 100644
--- a/libgo/go/sort/sort.go
+++ b/libgo/go/sort/sort.go
@@ -131,7 +131,7 @@ func doPivot(data Interface, lo, hi int) (midlo, midhi int) {
 		c--
 	}
 	// If hi-c<3 then there are duplicates (by property of median of nine).
-	// Let be a bit more conservative, and set border to 5.
+	// Let's be a bit more conservative, and set border to 5.
 	protect := hi-c < 5
 	if !protect && hi-c < (hi-lo)/4 {
 		// Lets test some points for equality to pivot
diff --git a/libgo/go/sync/atomic/doc.go b/libgo/go/sync/atomic/doc.go
index 7c007d7..108b76b 100644
--- a/libgo/go/sync/atomic/doc.go
+++ b/libgo/go/sync/atomic/doc.go
@@ -47,7 +47,8 @@ import (
 //
 // On non-Linux ARM, the 64-bit functions use instructions unavailable before the ARMv6k core.
 //
-// On both ARM and x86-32, it is the caller's responsibility to arrange for 64-bit
+// On ARM, x86-32, and 32-bit MIPS,
+// it is the caller's responsibility to arrange for 64-bit
 // alignment of 64-bit words accessed atomically. The first word in a
 // variable or in an allocated struct, array, or slice can be relied upon to be
 // 64-bit aligned.
diff --git a/libgo/go/testing/sub_test.go b/libgo/go/testing/sub_test.go
index 8c98971..5a6d51b 100644
--- a/libgo/go/testing/sub_test.go
+++ b/libgo/go/testing/sub_test.go
@@ -706,6 +706,55 @@ func TestRacyOutput(t *T) {
 	}
 }
 
+// The late log message did not include the test name.  Issue 29388.
+func TestLogAfterComplete(t *T) {
+	ctx := newTestContext(1, newMatcher(regexp.MatchString, "", ""))
+	var buf bytes.Buffer
+	t1 := &T{
+		common: common{
+			// Use a buffered channel so that tRunner can write
+			// to it although nothing is reading from it.
+			signal: make(chan bool, 1),
+			w:      &buf,
+		},
+		context: ctx,
+	}
+
+	c1 := make(chan bool)
+	c2 := make(chan string)
+	tRunner(t1, func(t *T) {
+		t.Run("TestLateLog", func(t *T) {
+			go func() {
+				defer close(c2)
+				defer func() {
+					p := recover()
+					if p == nil {
+						c2 <- "subtest did not panic"
+						return
+					}
+					s, ok := p.(string)
+					if !ok {
+						c2 <- fmt.Sprintf("subtest panic with unexpected value %v", p)
+						return
+					}
+					const want = "Log in goroutine after TestLateLog has completed"
+					if !strings.Contains(s, want) {
+						c2 <- fmt.Sprintf("subtest panic %q does not contain %q", s, want)
+					}
+				}()
+
+				<-c1
+				t.Log("log after test")
+			}()
+		})
+	})
+	close(c1)
+
+	if s := <-c2; s != "" {
+		t.Error(s)
+	}
+}
+
 func TestBenchmark(t *T) {
 	res := Benchmark(func(b *B) {
 		for i := 0; i < 5; i++ {
diff --git a/libgo/go/testing/testing.go b/libgo/go/testing/testing.go
index 0ac51b6..3068630 100644
--- a/libgo/go/testing/testing.go
+++ b/libgo/go/testing/testing.go
@@ -618,17 +618,20 @@ func (c *common) log(s string) {
 func (c *common) logDepth(s string, depth int) {
 	c.mu.Lock()
 	defer c.mu.Unlock()
-	// If this test has already finished try and log this message with our parent
-	// with this test name tagged so we know where it came from.
-	// If we don't have a parent panic.
-	if c.done {
-		if c.parent != nil {
-			c.parent.logDepth(s, depth+1)
-		} else {
-			panic("Log in goroutine after " + c.name + " has completed")
-		}
-	} else {
+	if !c.done {
 		c.output = append(c.output, c.decorate(s, depth+1)...)
+	} else {
+		// This test has already finished. Try and log this message
+		// with our parent. If we don't have a parent, panic.
+		for parent := c.parent; parent != nil; parent = parent.parent {
+			parent.mu.Lock()
+			defer parent.mu.Unlock()
+			if !parent.done {
+				parent.output = append(parent.output, parent.decorate(s, depth+1)...)
+				return
+			}
+		}
+		panic("Log in goroutine after " + c.name + " has completed")
 	}
 }
 
diff --git a/libgo/misc/cgo/test/cgo_test.go b/libgo/misc/cgo/test/cgo_test.go
index 242ba6c..2cb93d9 100644
--- a/libgo/misc/cgo/test/cgo_test.go
+++ b/libgo/misc/cgo/test/cgo_test.go
@@ -94,6 +94,7 @@ func Test26066(t *testing.T)                 { test26066(t) }
 func Test26213(t *testing.T)                 { test26213(t) }
 func Test27660(t *testing.T)                 { test27660(t) }
 func Test28896(t *testing.T)                 { test28896(t) }
+func Test30065(t *testing.T)                 { test30065(t) }
 
 func BenchmarkCgoCall(b *testing.B)  { benchCgoCall(b) }
 func BenchmarkGoString(b *testing.B) { benchGoString(b) }
diff --git a/libgo/misc/cgo/test/issue29748.go b/libgo/misc/cgo/test/issue29748.go
new file mode 100644
index 0000000..8229b3b
--- /dev/null
+++ b/libgo/misc/cgo/test/issue29748.go
@@ -0,0 +1,22 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Error handling a struct initializer that requires pointer checking.
+// Compilation test only, nothing to run.
+
+package cgotest
+
+// typedef struct { char **p; } S29748;
+// static int f29748(S29748 *p) { return 0; }
+import "C"
+
+var Vissue29748 = C.f29748(&C.S29748{
+	nil,
+})
+
+func Fissue299748() {
+	C.f29748(&C.S29748{
+		nil,
+	})
+}
diff --git a/libgo/misc/cgo/test/issue29781.go b/libgo/misc/cgo/test/issue29781.go
new file mode 100644
index 0000000..0fd8c08
--- /dev/null
+++ b/libgo/misc/cgo/test/issue29781.go
@@ -0,0 +1,17 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Error with newline inserted into constant expression.
+// Compilation test only, nothing to run.
+
+package cgotest
+
+// static void issue29781F(char **p, int n) {}
+// #define ISSUE29781C 0
+import "C"
+
+func issue29781G() {
+	var p *C.char
+	C.issue29781F(&p, C.ISSUE29781C+1)
+}
diff --git a/libgo/misc/cgo/test/issue30065.go b/libgo/misc/cgo/test/issue30065.go
new file mode 100644
index 0000000..396d437
--- /dev/null
+++ b/libgo/misc/cgo/test/issue30065.go
@@ -0,0 +1,38 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Don't make a private copy of an array when taking the address of an
+// element.
+
+package cgotest
+
+// #include <string.h>
+import "C"
+
+import (
+	"testing"
+	"unsafe"
+)
+
+func test30065(t *testing.T) {
+	var a [256]byte
+	b := []byte("a")
+	C.memcpy(unsafe.Pointer(&a), unsafe.Pointer(&b[0]), 1)
+	if a[0] != 'a' {
+		t.Errorf("&a failed: got %c, want %c", a[0], 'a')
+	}
+
+	b = []byte("b")
+	C.memcpy(unsafe.Pointer(&a[0]), unsafe.Pointer(&b[0]), 1)
+	if a[0] != 'b' {
+		t.Errorf("&a[0] failed: got %c, want %c", a[0], 'b')
+	}
+
+	d := make([]byte, 256)
+	b = []byte("c")
+	C.memcpy(unsafe.Pointer(&d[0]), unsafe.Pointer(&b[0]), 1)
+	if d[0] != 'c' {
+		t.Errorf("&d[0] failed: got %c, want %c", d[0], 'c')
+	}
+}