[dev.typeparams] all: merge master (06b86e9) into dev.typeparams

Merge List:

+ 2021-02-19 06b86e9803 cmd/compile:  fix check to avoid creating new closure function when typechecking inline body
+ 2021-02-19 9322eec8a2 codereview.cfg: add codereview.cfg for master branch
+ 2021-02-19 02e5a8fdfc runtime: ignore SPWRITE in syscall functions
+ 2021-02-19 fa18f224c3 runtime/pprof: disable TestMorestack on macOS under race detector
+ 2021-02-19 01eb70e3dd os: fix hex exit code print on 32-bit windows
+ 2021-02-19 49add6ad90 runtime: fix spurious stack overflow detection
+ 2021-02-19 fce2a94d84 cmd/compile: fix buglet in inlined info abstract function dwarf-gen
+ 2021-02-19 7764ee5614 runtime: fix invalid nil g check for for mips64x
+ 2021-02-19 87f425da14 cmd/go/internal/mvs: split Reqs into narrower per-function interfaces
+ 2021-02-19 4da0188c6c cmd/go/internal/modget: split resolveCandidates into two methods
+ 2021-02-19 5f2e24efb3 cmd/internal/diff: skip over Cygwin warning in diff output
+ 2021-02-19 ee7038f6a5 net: disable Windows netsh tests when netsh won't run
+ 2021-02-19 40765ffa95 os/exec: disable failing LookPathTest on windows/arm64
+ 2021-02-19 b445d6ea34 runtime/pprof: expect tests to pass on macOS
+ 2021-02-19 b110a43628 runtime: delete gosave (dead code)
+ 2021-02-19 474d5f4f4d math: remove most 387 implementations
+ 2021-02-19 c7c6c113be runtime: convert windows/arm64 assembly
+ 2021-02-19 3527caa7d6 runtime: initial windows/arm64 implementation files
+ 2021-02-19 427bd7599d runtime: generate windows/arm64 callback asm
+ 2021-02-19 f6c4b4bf96 syscall: add windows/arm64 support
+ 2021-02-19 ac024a0c7b cmd/vendor: get golang.org/x/sys@beda7e5e158
+ 2021-02-19 a3b97e7628 test: disable nilptr on windows/arm64
+ 2021-02-19 985d087782 cmd/link: add windows/arm64 support
+ 2021-02-19 95a44d2409 cmd/internal/objfile: recognize Windows ARM64 executables
+ 2021-02-19 0ca0551f02 debug/pe: recognize arm64 executables
+ 2021-02-19 0c633125f2 cmd/dist: add windows/arm64 support
+ 2021-02-19 bb6efb9609 build: set GOPATH consistently in run.bash, run.bat, run.rc
+ 2021-02-19 a1222b7535 cmd/link: add debug print in deadcode
+ 2021-02-19 1c659f2525 cmd/link: clean up windows PE generation
+ 2021-02-19 b6379f190b syscall: clean up windows a bit
+ 2021-02-19 09e059afb1 runtime: enable framepointer on all arm64
+ 2021-02-19 b19e7b518e runtime: clean up windows a bit
+ 2021-02-19 5421c37a1d runtime: fix windows/arm externalthreadhandler
+ 2021-02-19 91cc484ea9 runtime: fix time on windows/arm under WINE
+ 2021-02-19 38672d3dcf runtime: crash earlier on windows for runtime.abort
+ 2021-02-19 a1e9148e3d runtime: print hex numbers with hex prefixes in traceback debug
+ 2021-02-19 75e273fc2c runtime: fix windows/arm CONTEXT_CONTROL
+ 2021-02-19 76ab626bfc runtime: factor common code out of defs_windows_*.go
+ 2021-02-19 ece954d8b8 runtime: find g in Windows profiler using SP
+ 2021-02-19 a54f7fc0fd runtime: do not treat asmcgocall as a topofstack on g0
+ 2021-02-19 776ee4079a runtime: do not treat morestack as a topofstack
+ 2021-02-19 5ecd9e34df runtime: do not treat mcall as a topofstack
+ 2021-02-19 54da3ab385 runtime: use TOPFRAME to identify top-of-frame functions
+ 2021-02-19 fbe74dbf42 runtime: use FuncInfo SPWRITE flag to identify untraceable profile samples
+ 2021-02-19 4dd77bdc91 cmd/asm, cmd/link, runtime: introduce FuncInfo flag bits
+ 2021-02-19 aa0388f2ed runtime: remove unnecessary writes to gp.sched.g
+ 2021-02-19 6fe8981620 cmd/internal/obj/riscv: fix JMP name<>(SB)
+ 2021-02-19 01f05d8ff1 runtime: unify asmcgocall and systemstack traceback setup
+ 2021-02-19 229695a283 runtime: clean up funcID assignment
+ 2021-02-19 c80da0a33a runtime: handle nil gp in cpuprof
+ 2021-02-19 a78879ac67 runtime: move sys.DefaultGoroot to runtime.defaultGOROOT
+ 2021-02-19 8ac23a1f15 runtime: document, clean up internal/sys
+ 2021-02-19 678568a5cf runtime: delete windows setlasterror (unused)
+ 2021-02-19 0d94f989d1 runtime: clean up system calls during cgo callback init
+ 2021-02-19 e7ee3c1fa8 os: report Windows exit status in hex

Change-Id: Ib27e232dabac0604b588f27749bd8ad45a281fe3

misc/cgo/test/callback.go

@@ -182,7 +182,7 @@ func testCallbackCallers(t *testing.T) {
 		"runtime.cgocallbackg1",
 		"runtime.cgocallbackg",
 		"runtime.cgocallback",
-		"runtime.asmcgocall",
+		"runtime.systemstack_switch",
 		"runtime.cgocall",
 		"test._Cfunc_callback",
 		"test.nestedCall.func1",

src/cmd/asm/internal/asm/endtoend_test.go

@@ -36,6 +36,7 @@ func testEndToEnd(t *testing.T, goarch, file string) {
 	var ok bool
 	testOut = new(bytes.Buffer) // The assembler writes test output to this buffer.
 	ctxt.Bso = bufio.NewWriter(os.Stdout)
+	ctxt.IsAsm = true
 	defer ctxt.Bso.Flush()
 	failed := false
 	ctxt.DiagFunc = func(format string, args ...interface{}) {
@@ -278,6 +279,7 @@ func testErrors(t *testing.T, goarch, file string) {
 	var ok bool
 	testOut = new(bytes.Buffer) // The assembler writes test output to this buffer.
 	ctxt.Bso = bufio.NewWriter(os.Stdout)
+	ctxt.IsAsm = true
 	defer ctxt.Bso.Flush()
 	failed := false
 	var errBuf bytes.Buffer

src/cmd/asm/internal/flags/flags.go

@@ -32,11 +32,13 @@ var (
 	D        MultiFlag
 	I        MultiFlag
 	PrintOut int
+	DebugV   bool
 )
 
 func init() {
 	flag.Var(&D, "D", "predefined symbol with optional simple value -D=identifier=value; can be set multiple times")
 	flag.Var(&I, "I", "include directory; can be set multiple times")
+	flag.BoolVar(&DebugV, "v", false, "print debug output")
 	objabi.AddVersionFlag() // -V
 	objabi.Flagcount("S", "print assembly and machine code", &PrintOut)
 }

src/cmd/asm/main.go

@@ -36,6 +36,7 @@ func main() {
 
 	ctxt := obj.Linknew(architecture.LinkArch)
 	ctxt.Debugasm = flags.PrintOut
+	ctxt.Debugvlog = flags.DebugV
 	ctxt.Flag_dynlink = *flags.Dynlink
 	ctxt.Flag_linkshared = *flags.Linkshared
 	ctxt.Flag_shared = *flags.Shared || *flags.Dynlink

src/cmd/compile/internal/dwarfgen/dwarf.go

@@ -271,8 +271,7 @@ func createSimpleVar(fnsym *obj.LSym, n *ir.Name) *dwarf.Var {
 		if base.Ctxt.FixedFrameSize() == 0 {
 			offs -= int64(types.PtrSize)
 		}
-		if objabi.Framepointer_enabled || objabi.GOARCH == "arm64" {
+		if objabi.Framepointer_enabled {
-			// There is a word space for FP on ARM64 even if the frame pointer is disabled
 			offs -= int64(types.PtrSize)
 		}
 

src/cmd/compile/internal/dwarfgen/scope.go

@@ -37,7 +37,9 @@ func assembleScopes(fnsym *obj.LSym, fn *ir.Func, dwarfVars []*dwarf.Var, varSco
 	}
 
 	scopeVariables(dwarfVars, varScopes, dwarfScopes)
+	if fnsym.Func().Text != nil {
 		scopePCs(fnsym, fn.Marks, dwarfScopes)
+	}
 	return compactScopes(dwarfScopes)
 }
 

src/cmd/compile/internal/ssagen/pgen.go

@@ -213,8 +213,7 @@ func StackOffset(slot ssa.LocalSlot) int32 {
 		if base.Ctxt.FixedFrameSize() == 0 {
 			off -= int64(types.PtrSize)
 		}
-		if objabi.Framepointer_enabled || objabi.GOARCH == "arm64" {
+		if objabi.Framepointer_enabled {
-			// There is a word space for FP on ARM64 even if the frame pointer is disabled
 			off -= int64(types.PtrSize)
 		}
 	case ir.PPARAM, ir.PPARAMOUT:

src/cmd/compile/internal/test/fixedbugs_test.go

@@ -75,7 +75,7 @@ func TestIssue16214(t *testing.T) {
 	cmd := exec.Command(testenv.GoToolPath(t), "tool", "compile", "-S", "-o", filepath.Join(dir, "out.o"), src)
 	out, err := cmd.CombinedOutput()
 	if err != nil {
-		t.Fatalf("fail to run go tool compile: %v", err)
+		t.Fatalf("go tool compile: %v\n%s", err, out)
 	}
 
 	if strings.Contains(string(out), "unknown line number") {

src/cmd/compile/internal/test/global_test.go

@@ -50,7 +50,7 @@ func main() {
 	cmd := exec.Command(testenv.GoToolPath(t), "build", "-o", dst, src)
 	out, err := cmd.CombinedOutput()
 	if err != nil {
-		t.Fatalf("could not build target: %v", err)
+		t.Fatalf("could not build target: %v\n%s", err, out)
 	}
 
 	// Check destination to see if scanf code was included.
@@ -95,7 +95,7 @@ func main() {
 	cmd := exec.Command(testenv.GoToolPath(t), "build", "-gcflags", "-S", "-o", filepath.Join(dir, "test"), src)
 	out, err := cmd.CombinedOutput()
 	if err != nil {
-		t.Fatalf("could not build target: %v", err)
+		t.Fatalf("could not build target: %v\n%s", err, out)
 	}
 
 	patterns := []string{

src/cmd/compile/internal/typecheck/func.go

@@ -100,6 +100,11 @@ func PartialCallType(n *ir.SelectorExpr) *types.Type {
 	return t
 }
 
+// True if we are typechecking an inline body in ImportedBody below. We use this
+// flag to not create a new closure function in tcClosure when we are just
+// typechecking an inline body, as opposed to the body of a real function.
+var inTypeCheckInl bool
+
 // Lazy typechecking of imported bodies. For local functions, CanInline will set ->typecheck
 // because they're a copy of an already checked body.
 func ImportedBody(fn *ir.Func) {
@@ -138,7 +143,12 @@ func ImportedBody(fn *ir.Func) {
 
 	savefn := ir.CurFunc
 	ir.CurFunc = fn
+	if inTypeCheckInl {
+		base.Fatalf("inTypeCheckInl should not be set recursively")
+	}
+	inTypeCheckInl = true
 	Stmts(fn.Inl.Body)
+	inTypeCheckInl = false
 	ir.CurFunc = savefn
 
 	// During ImportBody (which imports fn.Func.Inl.Body),
@@ -307,7 +317,6 @@ func tcClosure(clo *ir.ClosureExpr, top int) {
 	// body in ImportedBody(), since we only want to create the named function
 	// when the closure is actually inlined (and then we force a typecheck
 	// explicitly in (*inlsubst).node()).
-	inTypeCheckInl := ir.CurFunc != nil && ir.CurFunc.Body == nil
 	if !inTypeCheckInl {
 		fn.Nname.SetSym(ClosureName(ir.CurFunc))
 		ir.MarkFunc(fn.Nname)

src/cmd/dist/build.go

@@ -1575,6 +1575,7 @@ var cgoEnabled = map[string]bool{
 	"windows/386":     true,
 	"windows/amd64":   true,
 	"windows/arm":     false,
+	"windows/arm64":   false,
 }
 
 // List of platforms which are supported but not complete yet. These get

src/cmd/dist/sys_windows.go

@@ -29,10 +29,13 @@ type systeminfo struct {
 	wProcessorRevision          uint16
 }
 
+// See https://docs.microsoft.com/en-us/windows/win32/api/sysinfoapi/ns-sysinfoapi-system_info
 const (
 	PROCESSOR_ARCHITECTURE_AMD64 = 9
 	PROCESSOR_ARCHITECTURE_INTEL = 0
 	PROCESSOR_ARCHITECTURE_ARM   = 5
+	PROCESSOR_ARCHITECTURE_ARM64 = 12
+	PROCESSOR_ARCHITECTURE_IA64  = 6
 )
 
 var sysinfo systeminfo
@@ -46,6 +49,8 @@ func sysinit() {
 		gohostarch = "386"
 	case PROCESSOR_ARCHITECTURE_ARM:
 		gohostarch = "arm"
+	case PROCESSOR_ARCHITECTURE_ARM64:
+		gohostarch = "arm64"
 	default:
 		fatalf("unknown processor architecture")
 	}

src/cmd/go.mod

@@ -7,6 +7,6 @@ require (
 	golang.org/x/arch v0.0.0-20201008161808-52c3e6f60cff
 	golang.org/x/crypto v0.0.0-20201016220609-9e8e0b390897
 	golang.org/x/mod v0.4.1
-	golang.org/x/sys v0.0.0-20201204225414-ed752295db88 // indirect
+	golang.org/x/sys v0.0.0-20210218145245-beda7e5e158e // indirect
 	golang.org/x/tools v0.0.0-20210107193943-4ed967dd8eff
 )

src/cmd/go.sum

@@ -25,8 +25,8 @@ golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191204072324-ce4227a45e2e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20201204225414-ed752295db88 h1:KmZPnMocC93w341XZp26yTJg8Za7lhb2KhkYmixoeso=
+golang.org/x/sys v0.0.0-20210218145245-beda7e5e158e h1:f5mksnk+hgXHnImpZoWj64ja99j9zV7YUgrVG95uFE4=
-golang.org/x/sys v0.0.0-20201204225414-ed752295db88/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210218145245-beda7e5e158e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=

src/cmd/go/internal/modget/get.go

@@ -310,7 +310,7 @@ func runGet(ctx context.Context, cmd *base.Command, args []string) {
 		r.performWildcardQueries(ctx)
 		r.performPatternAllQueries(ctx)
 
-		if changed := r.resolveCandidates(ctx, queries, nil); changed {
+		if changed := r.resolveQueries(ctx, queries); changed {
 			// 'go get' arguments can be (and often are) package patterns rather than
 			// (just) modules. A package can be provided by any module with a prefix
 			// of its import path, and a wildcard can even match packages in modules
@@ -347,12 +347,12 @@ func runGet(ctx context.Context, cmd *base.Command, args []string) {
 		// - ambiguous import errors.
 		//   TODO(#27899): Try to resolve ambiguous import errors automatically.
 		upgrades := r.findAndUpgradeImports(ctx, queries)
-		if changed := r.resolveCandidates(ctx, nil, upgrades); changed {
+		if changed := r.applyUpgrades(ctx, upgrades); changed {
 			continue
 		}
 
 		r.findMissingWildcards(ctx)
-		if changed := r.resolveCandidates(ctx, r.wildcardQueries, nil); changed {
+		if changed := r.resolveQueries(ctx, r.wildcardQueries); changed {
 			continue
 		}
 
@@ -461,7 +461,6 @@ type resolver struct {
 	resolvedVersion map[string]versionReason
 
 	buildList        []module.Version
-	buildListResolvedVersions int               // len(resolvedVersion) when buildList was computed
 	buildListVersion map[string]string // index of buildList (module path → version)
 
 	initialVersion map[string]string // index of the initial build list at the start of 'go get'
@@ -1176,24 +1175,19 @@ func (r *resolver) loadPackages(ctx context.Context, patterns []string, findPack
 // to be updated before its dependencies can be loaded.
 var errVersionChange = errors.New("version change needed")
 
-// resolveCandidates resolves candidates sets that are attached to the given
+// resolveQueries resolves candidate sets that are attached to the given
 // queries and/or needed to provide the given missing-package dependencies.
 //
-// resolveCandidates starts by resolving one module version from each
+// resolveQueries starts by resolving one module version from each
 // unambiguous pathSet attached to the given queries.
 //
 // If no unambiguous query results in a change to the build list,
-// resolveCandidates modifies the build list by adding one module version from
+// resolveQueries revisits the ambiguous query candidates and resolves them
-// each pathSet in missing, but does not mark those versions as resolved
-// (so they can still be modified by other queries).
-//
-// If that still does not result in any changes to the build list,
-// resolveCandidates revisits the ambiguous query candidates and resolves them
 // arbitrarily in order to guarantee forward progress.
 //
 // If all pathSets are resolved without any changes to the build list,
-// resolveCandidates returns with changed=false.
+// resolveQueries returns with changed=false.
-func (r *resolver) resolveCandidates(ctx context.Context, queries []*query, upgrades []pathSet) (changed bool) {
+func (r *resolver) resolveQueries(ctx context.Context, queries []*query) (changed bool) {
 	defer base.ExitIfErrors()
 
 	// Note: this is O(N²) with the number of pathSets in the worst case.
@@ -1247,12 +1241,52 @@ func (r *resolver) resolveCandidates(ctx context.Context, queries []*query, upgr
 		}
 	}
 
-	if changed := r.updateBuildList(ctx, nil); changed {
+	if resolved > 0 {
-		// The build list has changed, so disregard any missing packages: they might
+		if changed = r.updateBuildList(ctx, nil); changed {
-		// now be determined by requirements in the build list, which we would
+			// The build list has changed, so disregard any remaining ambiguous queries:
-		// prefer to use instead of arbitrary "latest" versions.
+			// they might now be determined by requirements in the build list, which we
+			// would prefer to use instead of arbitrary versions.
 			return true
 		}
+	}
+
+	// The build list will be the same on the next iteration as it was on this
+	// iteration, so any ambiguous queries will remain so. In order to make
+	// progress, resolve them arbitrarily but deterministically.
+	//
+	// If that results in conflicting versions, the user can re-run 'go get'
+	// with additional explicit versions for the conflicting packages or
+	// modules.
+	resolvedArbitrarily := 0
+	for _, q := range queries {
+		for _, cs := range q.candidates {
+			isPackage, m := r.chooseArbitrarily(cs)
+			if isPackage {
+				q.matchesPackages = true
+			}
+			r.resolve(q, m)
+			resolvedArbitrarily++
+		}
+	}
+	if resolvedArbitrarily > 0 {
+		changed = r.updateBuildList(ctx, nil)
+	}
+	return changed
+}
+
+// applyUpgrades disambiguates candidate sets that are needed to upgrade (or
+// provide) transitive dependencies imported by previously-resolved packages.
+//
+// applyUpgrades modifies the build list by adding one module version from each
+// pathSet in upgrades, then downgrading (or further upgrading) those modules as
+// needed to maintain any already-resolved versions of other modules.
+// applyUpgrades does not mark the new versions as resolved, so they can still
+// be further modified by other queries (such as wildcards).
+//
+// If all pathSets are resolved without any changes to the build list,
+// applyUpgrades returns with changed=false.
+func (r *resolver) applyUpgrades(ctx context.Context, upgrades []pathSet) (changed bool) {
+	defer base.ExitIfErrors()
 
 	// Arbitrarily add a "latest" version that provides each missing package, but
 	// do not mark the version as resolved: we still want to allow the explicit
@@ -1276,27 +1310,9 @@ func (r *resolver) resolveCandidates(ctx context.Context, queries []*query, upgr
 		tentative = append(tentative, m)
 	}
 	base.ExitIfErrors()
-	if changed := r.updateBuildList(ctx, tentative); changed {
-		return true
-	}
 
-	// The build list will be the same on the next iteration as it was on this
+	changed = r.updateBuildList(ctx, tentative)
-	// iteration, so any ambiguous queries will remain so. In order to make
+	return changed
-	// progress, resolve them arbitrarily but deterministically.
-	//
-	// If that results in conflicting versions, the user can re-run 'go get'
-	// with additional explicit versions for the conflicting packages or
-	// modules.
-	for _, q := range queries {
-		for _, cs := range q.candidates {
-			isPackage, m := r.chooseArbitrarily(cs)
-			if isPackage {
-				q.matchesPackages = true
-			}
-			r.resolve(q, m)
-		}
-	}
-	return r.updateBuildList(ctx, nil)
 }
 
 // disambiguate eliminates candidates from cs that conflict with other module
@@ -1614,11 +1630,10 @@ func (r *resolver) resolve(q *query, m module.Version) {
 //
 // If the additional modules conflict with the resolved versions, they will be
 // downgraded to a non-conflicting version (possibly "none").
+//
+// If the resulting build list is the same as the one resulting from the last
+// call to updateBuildList, updateBuildList returns with changed=false.
 func (r *resolver) updateBuildList(ctx context.Context, additions []module.Version) (changed bool) {
-	if len(additions) == 0 && len(r.resolvedVersion) == r.buildListResolvedVersions {
-		return false
-	}
-
 	defer base.ExitIfErrors()
 
 	resolved := make([]module.Version, 0, len(r.resolvedVersion))
@@ -1649,7 +1664,6 @@ func (r *resolver) updateBuildList(ctx context.Context, additions []module.Versi
 	}
 
 	buildList := modload.LoadAllModules(ctx)
-	r.buildListResolvedVersions = len(r.resolvedVersion)
 	if reflect.DeepEqual(r.buildList, buildList) {
 		return false
 	}

src/cmd/go/internal/mvs/mvs.go

@@ -41,6 +41,11 @@ type Reqs interface {
 	// Note that v1 < v2 can be written Max(v1, v2) != v1
 	// and similarly v1 <= v2 can be written Max(v1, v2) == v2.
 	Max(v1, v2 string) string
+}
+
+// An UpgradeReqs is a Reqs that can also identify available upgrades.
+type UpgradeReqs interface {
+	Reqs
 
 	// Upgrade returns the upgraded version of m,
 	// for use during an UpgradeAll operation.
@@ -54,6 +59,11 @@ type Reqs interface {
 	// TODO(rsc): Upgrade must be able to return errors,
 	// but should "no latest version" just return m instead?
 	Upgrade(m module.Version) (module.Version, error)
+}
+
+// A DowngradeReqs is a Reqs that can also identify available downgrades.
+type DowngradeReqs interface {
+	Reqs
 
 	// Previous returns the version of m.Path immediately prior to m.Version,
 	// or "none" if no such version is known.
@@ -323,7 +333,7 @@ func Req(target module.Version, base []string, reqs Reqs) ([]module.Version, err
 
 // UpgradeAll returns a build list for the target module
 // in which every module is upgraded to its latest version.
-func UpgradeAll(target module.Version, reqs Reqs) ([]module.Version, error) {
+func UpgradeAll(target module.Version, reqs UpgradeReqs) ([]module.Version, error) {
 	return buildList(target, reqs, func(m module.Version) (module.Version, error) {
 		if m.Path == target.Path {
 			return target, nil
@@ -335,7 +345,7 @@ func UpgradeAll(target module.Version, reqs Reqs) ([]module.Version, error) {
 
 // Upgrade returns a build list for the target module
 // in which the given additional modules are upgraded.
-func Upgrade(target module.Version, reqs Reqs, upgrade ...module.Version) ([]module.Version, error) {
+func Upgrade(target module.Version, reqs UpgradeReqs, upgrade ...module.Version) ([]module.Version, error) {
 	list, err := reqs.Required(target)
 	if err != nil {
 		return nil, err
@@ -374,7 +384,7 @@ func Upgrade(target module.Version, reqs Reqs, upgrade ...module.Version) ([]mod
 // The versions to be downgraded may be unreachable from reqs.Latest and
 // reqs.Previous, but the methods of reqs must otherwise handle such versions
 // correctly.
-func Downgrade(target module.Version, reqs Reqs, downgrade ...module.Version) ([]module.Version, error) {
+func Downgrade(target module.Version, reqs DowngradeReqs, downgrade ...module.Version) ([]module.Version, error) {
 	// Per https://research.swtch.com/vgo-mvs#algorithm_4:
 	// “To avoid an unnecessary downgrade to E 1.1, we must also add a new
 	// requirement on E 1.2. We can apply Algorithm R to find the minimal set of

src/cmd/internal/diff/diff.go

@@ -7,6 +7,7 @@
 package diff
 
 import (
+	"bytes"
 	exec "internal/execabs"
 	"io/ioutil"
 	"os"
@@ -38,6 +39,25 @@ func Diff(prefix string, b1, b2 []byte) ([]byte, error) {
 		// Ignore that failure as long as we get output.
 		err = nil
 	}
+
+	// If we are on Windows and the diff is Cygwin diff,
+	// machines can get into a state where every Cygwin
+	// command works fine but prints a useless message like:
+	//
+	//	Cygwin WARNING:
+	//	  Couldn't compute FAST_CWD pointer.  This typically occurs if you're using
+	//	  an older Cygwin version on a newer Windows.  Please update to the latest
+	//	  available Cygwin version from https://cygwin.com/.  If the problem persists,
+	//	  please see https://cygwin.com/problems.html
+	//
+	// Skip over that message and just return the actual diff.
+	if len(data) > 0 && !bytes.HasPrefix(data, []byte("--- ")) {
+		i := bytes.Index(data, []byte("\n--- "))
+		if i >= 0 && i < 80*10 && bytes.Contains(data[:i], []byte("://cygwin.com/")) {
+			data = data[i+1:]
+		}
+	}
+
 	return data, err
 }
 

src/cmd/internal/goobj/funcinfo.go

@@ -22,6 +22,7 @@ type FuncInfo struct {
 	Args     uint32
 	Locals   uint32
 	FuncID   objabi.FuncID
+	FuncFlag objabi.FuncFlag
 
 	Pcsp        SymRef
 	Pcfile      SymRef
@@ -35,6 +36,9 @@ type FuncInfo struct {
 }
 
 func (a *FuncInfo) Write(w *bytes.Buffer) {
+	writeUint8 := func(x uint8) {
+		w.WriteByte(x)
+	}
 	var b [4]byte
 	writeUint32 := func(x uint32) {
 		binary.LittleEndian.PutUint32(b[:], x)
@@ -47,8 +51,10 @@ func (a *FuncInfo) Write(w *bytes.Buffer) {
 
 	writeUint32(a.Args)
 	writeUint32(a.Locals)
-	writeUint32(uint32(a.FuncID))
+	writeUint8(uint8(a.FuncID))
-
+	writeUint8(uint8(a.FuncFlag))
+	writeUint8(0) // pad to uint32 boundary
+	writeUint8(0)
 	writeSymRef(a.Pcsp)
 	writeSymRef(a.Pcfile)
 	writeSymRef(a.Pcline)
@@ -72,46 +78,6 @@ func (a *FuncInfo) Write(w *bytes.Buffer) {
 	}
 }
 
-func (a *FuncInfo) Read(b []byte) {
-	readUint32 := func() uint32 {
-		x := binary.LittleEndian.Uint32(b)
-		b = b[4:]
-		return x
-	}
-	readSymIdx := func() SymRef {
-		return SymRef{readUint32(), readUint32()}
-	}
-
-	a.Args = readUint32()
-	a.Locals = readUint32()
-	a.FuncID = objabi.FuncID(readUint32())
-
-	a.Pcsp = readSymIdx()
-	a.Pcfile = readSymIdx()
-	a.Pcline = readSymIdx()
-	a.Pcinline = readSymIdx()
-	a.Pcdata = make([]SymRef, readUint32())
-	for i := range a.Pcdata {
-		a.Pcdata[i] = readSymIdx()
-	}
-
-	funcdataofflen := readUint32()
-	a.Funcdataoff = make([]uint32, funcdataofflen)
-	for i := range a.Funcdataoff {
-		a.Funcdataoff[i] = readUint32()
-	}
-	filelen := readUint32()
-	a.File = make([]CUFileIndex, filelen)
-	for i := range a.File {
-		a.File[i] = CUFileIndex(readUint32())
-	}
-	inltreelen := readUint32()
-	a.InlTree = make([]InlTreeNode, inltreelen)
-	for i := range a.InlTree {
-		b = a.InlTree[i].Read(b)
-	}
-}
-
 // FuncInfoLengths is a cache containing a roadmap of offsets and
 // lengths for things within a serialized FuncInfo. Each length field
 // stores the number of items (e.g. files, inltree nodes, etc), and the
@@ -159,7 +125,9 @@ func (*FuncInfo) ReadArgs(b []byte) uint32 { return binary.LittleEndian.Uint32(b
 
 func (*FuncInfo) ReadLocals(b []byte) uint32 { return binary.LittleEndian.Uint32(b[4:]) }
 
-func (*FuncInfo) ReadFuncID(b []byte) uint32 { return binary.LittleEndian.Uint32(b[8:]) }
+func (*FuncInfo) ReadFuncID(b []byte) objabi.FuncID { return objabi.FuncID(b[8]) }
+
+func (*FuncInfo) ReadFuncFlag(b []byte) objabi.FuncFlag { return objabi.FuncFlag(b[9]) }
 
 func (*FuncInfo) ReadPcsp(b []byte) SymRef {
 	return SymRef{binary.LittleEndian.Uint32(b[12:]), binary.LittleEndian.Uint32(b[16:])}

src/cmd/internal/goobj/objfile.go

@@ -298,7 +298,6 @@ const (
 	SymFlagNoSplit
 	SymFlagReflectMethod
 	SymFlagGoType
-	SymFlagTopFrame
 )
 
 // Sym.Flag2
@@ -332,7 +331,6 @@ func (s *Sym) Leaf() bool          { return s.Flag()&SymFlagLeaf != 0 }
 func (s *Sym) NoSplit() bool       { return s.Flag()&SymFlagNoSplit != 0 }
 func (s *Sym) ReflectMethod() bool { return s.Flag()&SymFlagReflectMethod != 0 }
 func (s *Sym) IsGoType() bool      { return s.Flag()&SymFlagGoType != 0 }
-func (s *Sym) TopFrame() bool      { return s.Flag()&SymFlagTopFrame != 0 }
 func (s *Sym) UsedInIface() bool   { return s.Flag2()&SymFlagUsedInIface != 0 }
 func (s *Sym) IsItab() bool        { return s.Flag2()&SymFlagItab != 0 }
 

src/cmd/internal/obj/arm/obj5.go

@@ -34,6 +34,7 @@ import (
 	"cmd/internal/obj"
 	"cmd/internal/objabi"
 	"cmd/internal/sys"
+	"log"
 )
 
 var progedit_tlsfallback *obj.LSym
@@ -613,6 +614,21 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
 				p.From.Reg = REGSP
 			}
 		}
+
+		if p.To.Type == obj.TYPE_REG && p.To.Reg == REGSP && p.Spadj == 0 {
+			f := c.cursym.Func()
+			if f.FuncFlag&objabi.FuncFlag_SPWRITE == 0 {
+				c.cursym.Func().FuncFlag |= objabi.FuncFlag_SPWRITE
+				if ctxt.Debugvlog || !ctxt.IsAsm {
+					ctxt.Logf("auto-SPWRITE: %s %v\n", c.cursym.Name, p)
+					if !ctxt.IsAsm {
+						ctxt.Diag("invalid auto-SPWRITE in non-assembly")
+						ctxt.DiagFlush()
+						log.Fatalf("bad SPWRITE")
+					}
+				}
+			}
+		}
 	}
 }
 

src/cmd/internal/obj/arm64/a.out.go

@@ -239,7 +239,7 @@ const (
 	REGCTXT = REG_R26 // environment for closures
 	REGTMP  = REG_R27 // reserved for liblink
 	REGG    = REG_R28 // G
-	REGFP   = REG_R29 // frame pointer, unused in the Go toolchain
+	REGFP   = REG_R29 // frame pointer
 	REGLINK = REG_R30
 
 	// ARM64 uses R31 as both stack pointer and zero register,

src/cmd/internal/obj/arm64/obj7.go

@@ -35,6 +35,7 @@ import (
 	"cmd/internal/objabi"
 	"cmd/internal/src"
 	"cmd/internal/sys"
+	"log"
 	"math"
 )
 
@@ -621,7 +622,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
 
 			prologueEnd.Pos = prologueEnd.Pos.WithXlogue(src.PosPrologueEnd)
 
-			if objabi.Framepointer_enabled {
+			// Frame pointer.
 			q1 = obj.Appendp(q1, c.newprog)
 			q1.Pos = p.Pos
 			q1.As = AMOVD
@@ -639,7 +640,6 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
 			q1.Reg = REGSP
 			q1.To.Type = obj.TYPE_REG
 			q1.To.Reg = REGFP
-			}
 
 			if c.cursym.Func().Text.From.Sym.Wrapper() {
 				// if(g->panic != nil && g->panic->argp == FP) g->panic->argp = bottom-of-frame
@@ -764,7 +764,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
 					p.To.Reg = REGSP
 					p.Spadj = -c.autosize
 
-					if objabi.Framepointer_enabled {
+					// Frame pointer.
 					p = obj.Appendp(p, c.newprog)
 					p.As = ASUB
 					p.From.Type = obj.TYPE_CONST
@@ -773,11 +773,10 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
 					p.To.Type = obj.TYPE_REG
 					p.To.Reg = REGFP
 				}
-				}
 			} else {
 				/* want write-back pre-indexed SP+autosize -> SP, loading REGLINK*/
 
-				if objabi.Framepointer_enabled {
+				// Frame pointer.
 				p.As = AMOVD
 				p.From.Type = obj.TYPE_MEM
 				p.From.Reg = REGSP
@@ -785,7 +784,6 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
 				p.To.Type = obj.TYPE_REG
 				p.To.Reg = REGFP
 				p = obj.Appendp(p, c.newprog)
-				}
 
 				aoffset := c.autosize
 
@@ -820,6 +818,28 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
 				}
 			}
 
+			// If enabled, this code emits 'MOV PC, R27' before every 'MOV LR, PC',
+			// so that if you are debugging a low-level crash where PC and LR are zero,
+			// you can look at R27 to see what jumped to the zero.
+			// This is useful when bringing up Go on a new system.
+			// (There is similar code in ../ppc64/obj9.go:/if.false.)
+			const debugRETZERO = false
+			if debugRETZERO {
+				if p.As != obj.ARET {
+					q = newprog()
+					q.Pos = p.Pos
+					q.Link = p.Link
+					p.Link = q
+					p = q
+				}
+				p.As = AADR
+				p.From.Type = obj.TYPE_BRANCH
+				p.From.Offset = 0
+				p.To.Type = obj.TYPE_REG
+				p.To.Reg = REGTMP
+
+			}
+
 			if p.As != obj.ARET {
 				q = newprog()
 				q.Pos = p.Pos
@@ -865,7 +885,6 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
 			}
 
 		case obj.ADUFFCOPY:
-			if objabi.Framepointer_enabled {
 			//  ADR	ret_addr, R27
 			//  STP	(FP, R27), -24(SP)
 			//  SUB	24, SP, FP
@@ -895,7 +914,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
 			q2.To.Reg = REGSP
 			q2.To.Offset = -24
 
-				// maintaine FP for DUFFCOPY
+			// maintain FP for DUFFCOPY
 			q3 := obj.Appendp(q2, c.newprog)
 			q3.Pos = p.Pos
 			q3.As = ASUB
@@ -915,10 +934,8 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
 			q5.To.Reg = REGFP
 			q1.From.SetTarget(q5)
 			p = q5
-			}
 
 		case obj.ADUFFZERO:
-			if objabi.Framepointer_enabled {
 			//  ADR	ret_addr, R27
 			//  STP	(FP, R27), -24(SP)
 			//  SUB	24, SP, FP
@@ -948,7 +965,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
 			q2.To.Reg = REGSP
 			q2.To.Offset = -24
 
-				// maintaine FP for DUFFZERO
+			// maintain FP for DUFFZERO
 			q3 := obj.Appendp(q2, c.newprog)
 			q3.Pos = p.Pos
 			q3.As = ASUB
@@ -969,6 +986,20 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
 			q1.From.SetTarget(q5)
 			p = q5
 		}
+
+		if p.To.Type == obj.TYPE_REG && p.To.Reg == REGSP && p.Spadj == 0 {
+			f := c.cursym.Func()
+			if f.FuncFlag&objabi.FuncFlag_SPWRITE == 0 {
+				c.cursym.Func().FuncFlag |= objabi.FuncFlag_SPWRITE
+				if ctxt.Debugvlog || !ctxt.IsAsm {
+					ctxt.Logf("auto-SPWRITE: %s %v\n", c.cursym.Name, p)
+					if !ctxt.IsAsm {
+						ctxt.Diag("invalid auto-SPWRITE in non-assembly")
+						ctxt.DiagFlush()
+						log.Fatalf("bad SPWRITE")
+					}
+				}
+			}
 		}
 	}
 }

src/cmd/internal/obj/link.go

@@ -454,6 +454,7 @@ type FuncInfo struct {
 	Locals   int32
 	Align    int32
 	FuncID   objabi.FuncID
+	FuncFlag objabi.FuncFlag
 	Text     *Prog
 	Autot    map[*LSym]struct{}
 	Pcln     Pcln
@@ -619,10 +620,6 @@ const (
 	// target of an inline during compilation
 	AttrWasInlined
 
-	// TopFrame means that this function is an entry point and unwinders should not
-	// keep unwinding beyond this frame.
-	AttrTopFrame
-
 	// Indexed indicates this symbol has been assigned with an index (when using the
 	// new object file format).
 	AttrIndexed
@@ -663,7 +660,6 @@ func (a *Attribute) NeedCtxt() bool           { return a.load()&AttrNeedCtxt !=
 func (a *Attribute) NoFrame() bool            { return a.load()&AttrNoFrame != 0 }
 func (a *Attribute) Static() bool             { return a.load()&AttrStatic != 0 }
 func (a *Attribute) WasInlined() bool         { return a.load()&AttrWasInlined != 0 }
-func (a *Attribute) TopFrame() bool           { return a.load()&AttrTopFrame != 0 }
 func (a *Attribute) Indexed() bool            { return a.load()&AttrIndexed != 0 }
 func (a *Attribute) UsedInIface() bool        { return a.load()&AttrUsedInIface != 0 }
 func (a *Attribute) ContentAddressable() bool { return a.load()&AttrContentAddressable != 0 }
@@ -713,14 +709,13 @@ var textAttrStrings = [...]struct {
 	{bit: AttrNoFrame, s: "NOFRAME"},
 	{bit: AttrStatic, s: "STATIC"},
 	{bit: AttrWasInlined, s: ""},
-	{bit: AttrTopFrame, s: "TOPFRAME"},
 	{bit: AttrIndexed, s: ""},
 	{bit: AttrContentAddressable, s: ""},
 	{bit: AttrABIWrapper, s: "ABIWRAPPER"},
 }
 
-// TextAttrString formats a for printing in as part of a TEXT prog.
+// String formats a for printing in as part of a TEXT prog.
-func (a Attribute) TextAttrString() string {
+func (a Attribute) String() string {
 	var s string
 	for _, x := range textAttrStrings {
 		if a&x.bit != 0 {
@@ -746,6 +741,18 @@ func (a Attribute) TextAttrString() string {
 	return s
 }
 
+// TextAttrString formats the symbol attributes for printing in as part of a TEXT prog.
+func (s *LSym) TextAttrString() string {
+	attr := s.Attribute.String()
+	if s.Func().FuncFlag&objabi.FuncFlag_TOPFRAME != 0 {
+		if attr != "" {
+			attr += "|"
+		}
+		attr += "TOPFRAME"
+	}
+	return attr
+}
+
 func (s *LSym) String() string {
 	return s.Name
 }

src/cmd/internal/obj/mips/obj0.go

@@ -35,6 +35,7 @@ import (
 	"cmd/internal/sys"
 	"encoding/binary"
 	"fmt"
+	"log"
 	"math"
 )
 
@@ -536,6 +537,21 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
 				p.From.Reg = REGSP
 			}
 		}
+
+		if p.To.Type == obj.TYPE_REG && p.To.Reg == REGSP && p.Spadj == 0 {
+			f := c.cursym.Func()
+			if f.FuncFlag&objabi.FuncFlag_SPWRITE == 0 {
+				c.cursym.Func().FuncFlag |= objabi.FuncFlag_SPWRITE
+				if ctxt.Debugvlog || !ctxt.IsAsm {
+					ctxt.Logf("auto-SPWRITE: %s %v\n", c.cursym.Name, p)
+					if !ctxt.IsAsm {
+						ctxt.Diag("invalid auto-SPWRITE in non-assembly")
+						ctxt.DiagFlush()
+						log.Fatalf("bad SPWRITE")
+					}
+				}
+			}
+		}
 	}
 
 	if c.ctxt.Arch.Family == sys.MIPS {

src/cmd/internal/obj/objfile.go

@@ -330,9 +330,6 @@ func (w *writer) Sym(s *LSym) {
 	if s.ReflectMethod() {
 		flag |= goobj.SymFlagReflectMethod
 	}
-	if s.TopFrame() {
-		flag |= goobj.SymFlagTopFrame
-	}
 	if strings.HasPrefix(s.Name, "type.") && s.Name[5] != '.' && s.Type == objabi.SRODATA {
 		flag |= goobj.SymFlagGoType
 	}
@@ -675,7 +672,8 @@ func genFuncInfoSyms(ctxt *Link) {
 		o := goobj.FuncInfo{
 			Args:     uint32(fn.Args),
 			Locals:   uint32(fn.Locals),
-			FuncID: objabi.FuncID(fn.FuncID),
+			FuncID:   fn.FuncID,
+			FuncFlag: fn.FuncFlag,
 		}
 		pc := &fn.Pcln
 		o.Pcsp = makeSymRef(preparePcSym(pc.Pcsp))
@@ -788,7 +786,7 @@ func (ctxt *Link) writeSymDebugNamed(s *LSym, name string) {
 	if s.NoSplit() {
 		fmt.Fprintf(ctxt.Bso, "nosplit ")
 	}
-	if s.TopFrame() {
+	if s.Func() != nil && s.Func().FuncFlag&objabi.FuncFlag_TOPFRAME != 0 {
 		fmt.Fprintf(ctxt.Bso, "topframe ")
 	}
 	fmt.Fprintf(ctxt.Bso, "size=%d", s.Size)

src/cmd/internal/obj/plist.go

@@ -134,6 +134,7 @@ func (ctxt *Link) InitTextSym(s *LSym, flag int) {
 	}
 	name := strings.Replace(s.Name, "\"\"", ctxt.Pkgpath, -1)
 	s.Func().FuncID = objabi.GetFuncID(name, flag&WRAPPER != 0)
+	s.Func().FuncFlag = toFuncFlag(flag)
 	s.Set(AttrOnList, true)
 	s.Set(AttrDuplicateOK, flag&DUPOK != 0)
 	s.Set(AttrNoSplit, flag&NOSPLIT != 0)
@@ -142,7 +143,6 @@ func (ctxt *Link) InitTextSym(s *LSym, flag int) {
 	s.Set(AttrABIWrapper, flag&ABIWRAPPER != 0)
 	s.Set(AttrNeedCtxt, flag&NEEDCTXT != 0)
 	s.Set(AttrNoFrame, flag&NOFRAME != 0)
-	s.Set(AttrTopFrame, flag&TOPFRAME != 0)
 	s.Type = objabi.STEXT
 	ctxt.Text = append(ctxt.Text, s)
 
@@ -150,6 +150,14 @@ func (ctxt *Link) InitTextSym(s *LSym, flag int) {
 	ctxt.dwarfSym(s)
 }
 
+func toFuncFlag(flag int) objabi.FuncFlag {
+	var out objabi.FuncFlag
+	if flag&TOPFRAME != 0 {
+		out |= objabi.FuncFlag_TOPFRAME
+	}
+	return out
+}
+
 func (ctxt *Link) Globl(s *LSym, size int64, flag int) {
 	if s.OnList() {
 		ctxt.Diag("symbol %s listed multiple times", s.Name)

src/cmd/internal/obj/ppc64/obj9.go

@@ -34,6 +34,7 @@ import (
 	"cmd/internal/objabi"
 	"cmd/internal/src"
 	"cmd/internal/sys"
+	"log"
 )
 
 func progedit(ctxt *obj.Link, p *obj.Prog, newprog obj.ProgAlloc) {
@@ -984,6 +985,21 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
 				p.From.Reg = REGSP
 			}
 		}
+
+		if p.To.Type == obj.TYPE_REG && p.To.Reg == REGSP && p.Spadj == 0 && p.As != ACMPU {
+			f := c.cursym.Func()
+			if f.FuncFlag&objabi.FuncFlag_SPWRITE == 0 {
+				c.cursym.Func().FuncFlag |= objabi.FuncFlag_SPWRITE
+				if ctxt.Debugvlog || !ctxt.IsAsm {
+					ctxt.Logf("auto-SPWRITE: %s %v\n", c.cursym.Name, p)
+					if !ctxt.IsAsm {
+						ctxt.Diag("invalid auto-SPWRITE in non-assembly")
+						ctxt.DiagFlush()
+						log.Fatalf("bad SPWRITE")
+					}
+				}
+			}
+		}
 	}
 }
 

src/cmd/internal/obj/riscv/obj.go

@@ -25,6 +25,7 @@ import (
 	"cmd/internal/objabi"
 	"cmd/internal/sys"
 	"fmt"
+	"log"
 )
 
 func buildop(ctxt *obj.Link) {}
@@ -119,7 +120,7 @@ func progedit(ctxt *obj.Link, p *obj.Prog, newprog obj.ProgAlloc) {
 			switch p.To.Name {
 			case obj.NAME_NONE:
 				p.As = AJALR
-			case obj.NAME_EXTERN:
+			case obj.NAME_EXTERN, obj.NAME_STATIC:
 				// Handled in preprocess.
 			default:
 				ctxt.Diag("unsupported name %d for %v", p.To.Name, p)
@@ -267,7 +268,7 @@ func rewriteMOV(ctxt *obj.Link, newprog obj.ProgAlloc, p *obj.Prog) {
 				p.As = movToStore(p.As)
 				p.To.Reg = addrToReg(p.To)
 
-			case obj.NAME_EXTERN:
+			case obj.NAME_EXTERN, obj.NAME_STATIC:
 				// AUIPC $off_hi, TMP
 				// S $off_lo, TMP, R
 				as := p.As
@@ -666,7 +667,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
 			switch p.To.Type {
 			case obj.TYPE_MEM:
 				switch p.To.Name {
-				case obj.NAME_EXTERN:
+				case obj.NAME_EXTERN, obj.NAME_STATIC:
 					// JMP to symbol.
 					jalrToSym(ctxt, p, newprog, REG_ZERO)
 				}
@@ -716,6 +717,21 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
 				p.Spadj = int32(-p.From.Offset)
 			}
 		}
+
+		if p.To.Type == obj.TYPE_REG && p.To.Reg == REGSP && p.Spadj == 0 {
+			f := cursym.Func()
+			if f.FuncFlag&objabi.FuncFlag_SPWRITE == 0 {
+				f.FuncFlag |= objabi.FuncFlag_SPWRITE
+				if ctxt.Debugvlog || !ctxt.IsAsm {
+					ctxt.Logf("auto-SPWRITE: %s %v\n", cursym.Name, p)
+					if !ctxt.IsAsm {
+						ctxt.Diag("invalid auto-SPWRITE in non-assembly")
+						ctxt.DiagFlush()
+						log.Fatalf("bad SPWRITE")
+					}
+				}
+			}
+		}
 	}
 
 	// Rewrite MOV pseudo-instructions. This cannot be done in

src/cmd/internal/obj/s390x/objz.go

@@ -33,6 +33,7 @@ import (
 	"cmd/internal/obj"
 	"cmd/internal/objabi"
 	"cmd/internal/sys"
+	"log"
 	"math"
 )
 
@@ -545,6 +546,21 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
 				p.From.Reg = REGSP
 			}
 		}
+
+		if p.To.Type == obj.TYPE_REG && p.To.Reg == REGSP && p.Spadj == 0 {
+			f := c.cursym.Func()
+			if f.FuncFlag&objabi.FuncFlag_SPWRITE == 0 {
+				c.cursym.Func().FuncFlag |= objabi.FuncFlag_SPWRITE
+				if ctxt.Debugvlog || !ctxt.IsAsm {
+					ctxt.Logf("auto-SPWRITE: %s\n", c.cursym.Name)
+					if !ctxt.IsAsm {
+						ctxt.Diag("invalid auto-SPWRITE in non-assembly")
+						ctxt.DiagFlush()
+						log.Fatalf("bad SPWRITE")
+					}
+				}
+			}
+		}
 	}
 	if wasSplit {
 		c.stacksplitPost(pLast, pPre, pPreempt, autosize) // emit post part of split check

src/cmd/internal/obj/util.go

@@ -187,7 +187,7 @@ func (p *Prog) WriteInstructionString(w io.Writer) {
 		// In short, print one of these two:
 		// TEXT	foo(SB), DUPOK|NOSPLIT, $0
 		// TEXT	foo(SB), $0
-		s := p.From.Sym.Attribute.TextAttrString()
+		s := p.From.Sym.TextAttrString()
 		if s != "" {
 			fmt.Fprintf(w, "%s%s", sep, s)
 			sep = ", "

src/cmd/internal/obj/x86/obj6.go

@@ -35,6 +35,7 @@ import (
 	"cmd/internal/objabi"
 	"cmd/internal/src"
 	"cmd/internal/sys"
+	"log"
 	"math"
 	"strings"
 )
@@ -839,6 +840,20 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
 
 		switch p.As {
 		default:
+			if p.To.Type == obj.TYPE_REG && p.To.Reg == REG_SP && p.As != ACMPL && p.As != ACMPQ {
+				f := cursym.Func()
+				if f.FuncFlag&objabi.FuncFlag_SPWRITE == 0 {
+					f.FuncFlag |= objabi.FuncFlag_SPWRITE
+					if ctxt.Debugvlog || !ctxt.IsAsm {
+						ctxt.Logf("auto-SPWRITE: %s %v\n", cursym.Name, p)
+						if !ctxt.IsAsm {
+							ctxt.Diag("invalid auto-SPWRITE in non-assembly")
+							ctxt.DiagFlush()
+							log.Fatalf("bad SPWRITE")
+						}
+					}
+				}
+			}
 			continue
 
 		case APUSHL, APUSHFL:

src/cmd/internal/objabi/funcid.go

@@ -4,97 +4,89 @@
 
 package objabi
 
+import "strings"
+
+// A FuncFlag records bits about a function, passed to the runtime.
+type FuncFlag uint8
+
+// Note: This list must match the list in runtime/symtab.go.
+const (
+	FuncFlag_TOPFRAME = 1 << iota
+	FuncFlag_SPWRITE
+)
+
 // A FuncID identifies particular functions that need to be treated
 // specially by the runtime.
 // Note that in some situations involving plugins, there may be multiple
 // copies of a particular special runtime function.
-// Note: this list must match the list in runtime/symtab.go.
 type FuncID uint8
 
+// Note: this list must match the list in runtime/symtab.go.
 const (
 	FuncID_normal FuncID = iota // not a special function
-	FuncID_runtime_main
+	FuncID_asmcgocall
+	FuncID_asyncPreempt
+	FuncID_cgocallback
+	FuncID_debugCallV1
+	FuncID_externalthreadhandler
+	FuncID_gcBgMarkWorker
 	FuncID_goexit
+	FuncID_gogo
+	FuncID_gopanic
+	FuncID_handleAsyncEvent
 	FuncID_jmpdefer
 	FuncID_mcall
 	FuncID_morestack
 	FuncID_mstart
-	FuncID_rt0_go
-	FuncID_asmcgocall
-	FuncID_sigpanic
-	FuncID_runfinq
-	FuncID_gcBgMarkWorker
-	FuncID_systemstack_switch
-	FuncID_systemstack
-	FuncID_cgocallback
-	FuncID_gogo
-	FuncID_externalthreadhandler
-	FuncID_debugCallV1
-	FuncID_gopanic
 	FuncID_panicwrap
-	FuncID_handleAsyncEvent
+	FuncID_rt0_go
-	FuncID_asyncPreempt
+	FuncID_runfinq
+	FuncID_runtime_main
+	FuncID_sigpanic
+	FuncID_systemstack
+	FuncID_systemstack_switch
 	FuncID_wrapper // any autogenerated code (hash/eq algorithms, method wrappers, etc.)
 )
 
+var funcIDs = map[string]FuncID{
+	"asmcgocall":            FuncID_asmcgocall,
+	"asyncPreempt":          FuncID_asyncPreempt,
+	"cgocallback":           FuncID_cgocallback,
+	"debugCallV1":           FuncID_debugCallV1,
+	"externalthreadhandler": FuncID_externalthreadhandler,
+	"gcBgMarkWorker":        FuncID_gcBgMarkWorker,
+	"go":                    FuncID_rt0_go,
+	"goexit":                FuncID_goexit,
+	"gogo":                  FuncID_gogo,
+	"gopanic":               FuncID_gopanic,
+	"handleAsyncEvent":      FuncID_handleAsyncEvent,
+	"jmpdefer":              FuncID_jmpdefer,
+	"main":                  FuncID_runtime_main,
+	"mcall":                 FuncID_mcall,
+	"morestack":             FuncID_morestack,
+	"mstart":                FuncID_mstart,
+	"panicwrap":             FuncID_panicwrap,
+	"runfinq":               FuncID_runfinq,
+	"sigpanic":              FuncID_sigpanic,
+	"switch":                FuncID_systemstack_switch,
+	"systemstack":           FuncID_systemstack,
+
+	// Don't show in call stack but otherwise not special.
+	"deferreturn":       FuncID_wrapper,
+	"runOpenDeferFrame": FuncID_wrapper,
+	"reflectcallSave":   FuncID_wrapper,
+}
+
 // Get the function ID for the named function in the named file.
 // The function should be package-qualified.
 func GetFuncID(name string, isWrapper bool) FuncID {
 	if isWrapper {
 		return FuncID_wrapper
 	}
-	switch name {
+	if strings.HasPrefix(name, "runtime.") {
-	case "runtime.main":
+		if id, ok := funcIDs[name[len("runtime."):]]; ok {
-		return FuncID_runtime_main
+			return id
-	case "runtime.goexit":
+		}
-		return FuncID_goexit
-	case "runtime.jmpdefer":
-		return FuncID_jmpdefer
-	case "runtime.mcall":
-		return FuncID_mcall
-	case "runtime.morestack":
-		return FuncID_morestack
-	case "runtime.mstart":
-		return FuncID_mstart
-	case "runtime.rt0_go":
-		return FuncID_rt0_go
-	case "runtime.asmcgocall":
-		return FuncID_asmcgocall
-	case "runtime.sigpanic":
-		return FuncID_sigpanic
-	case "runtime.runfinq":
-		return FuncID_runfinq
-	case "runtime.gcBgMarkWorker":
-		return FuncID_gcBgMarkWorker
-	case "runtime.systemstack_switch":
-		return FuncID_systemstack_switch
-	case "runtime.systemstack":
-		return FuncID_systemstack
-	case "runtime.cgocallback":
-		return FuncID_cgocallback
-	case "runtime.gogo":
-		return FuncID_gogo
-	case "runtime.externalthreadhandler":
-		return FuncID_externalthreadhandler
-	case "runtime.debugCallV1":
-		return FuncID_debugCallV1
-	case "runtime.gopanic":
-		return FuncID_gopanic
-	case "runtime.panicwrap":
-		return FuncID_panicwrap
-	case "runtime.handleAsyncEvent":
-		return FuncID_handleAsyncEvent
-	case "runtime.asyncPreempt":
-		return FuncID_asyncPreempt
-	case "runtime.deferreturn":
-		// Don't show in the call stack (used when invoking defer functions)
-		return FuncID_wrapper
-	case "runtime.runOpenDeferFrame":
-		// Don't show in the call stack (used when invoking defer functions)
-		return FuncID_wrapper
-	case "runtime.reflectcallSave":
-		// Don't show in the call stack (used when invoking defer functions)
-		return FuncID_wrapper
 	}
 	return FuncID_normal
 }

src/cmd/internal/objabi/util.go

@@ -137,7 +137,7 @@ func init() {
 }
 
 // Note: must agree with runtime.framepointer_enabled.
-var Framepointer_enabled = GOARCH == "amd64" || GOARCH == "arm64" && (GOOS == "linux" || GOOS == "darwin" || GOOS == "ios")
+var Framepointer_enabled = GOARCH == "amd64" || GOARCH == "arm64"
 
 func addexp(s string) {
 	// Could do general integer parsing here, but the runtime copy doesn't yet.

src/cmd/internal/objfile/pe.go

@@ -189,6 +189,8 @@ func (f *peFile) goarch() string {
 		return "amd64"
 	case pe.IMAGE_FILE_MACHINE_ARMNT:
 		return "arm"
+	case pe.IMAGE_FILE_MACHINE_ARM64:
+		return "arm64"
 	default:
 		return ""
 	}

src/cmd/link/internal/arm64/asm.go

@@ -568,6 +568,40 @@ func machoreloc1(arch *sys.Arch, out *ld.OutBuf, ldr *loader.Loader, s loader.Sy
 	return true
 }
 
+func pereloc1(arch *sys.Arch, out *ld.OutBuf, ldr *loader.Loader, s loader.Sym, r loader.ExtReloc, sectoff int64) bool {
+	var v uint32
+
+	rs := r.Xsym
+	rt := r.Type
+
+	if ldr.SymDynid(rs) < 0 {
+		ldr.Errorf(s, "reloc %d (%s) to non-coff symbol %s type=%d (%s)", rt, sym.RelocName(arch, rt), ldr.SymName(rs), ldr.SymType(rs), ldr.SymType(rs))
+		return false
+	}
+
+	out.Write32(uint32(sectoff))
+	out.Write32(uint32(ldr.SymDynid(rs)))
+
+	switch rt {
+	default:
+		return false
+
+	case objabi.R_DWARFSECREF:
+		v = ld.IMAGE_REL_ARM64_SECREL
+
+	case objabi.R_ADDR:
+		if r.Size == 8 {
+			v = ld.IMAGE_REL_ARM64_ADDR64
+		} else {
+			v = ld.IMAGE_REL_ARM64_ADDR32
+		}
+	}
+
+	out.Write16(uint16(v))
+
+	return true
+}
+
 func archreloc(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, r loader.Reloc, s loader.Sym, val int64) (int64, int, bool) {
 	const noExtReloc = 0
 	const isOk = true

src/cmd/link/internal/arm64/obj.go

@@ -58,6 +58,7 @@ func Init() (*sys.Arch, ld.Arch) {
 		GenSymsLate:      gensymlate,
 		Machoreloc1:      machoreloc1,
 		MachorelocSize:   8,
+		PEreloc1:         pereloc1,
 
 		Androiddynld: "/system/bin/linker64",
 		Linuxdynld:   "/lib/ld-linux-aarch64.so.1",
@@ -108,5 +109,9 @@ func archinit(ctxt *ld.Link) {
 		if *ld.FlagRound == -1 {
 			*ld.FlagRound = 16384 // 16K page alignment
 		}
+
+	case objabi.Hwindows: /* PE executable */
+		// ld.HEADR, ld.FlagTextAddr, ld.FlagRound are set in ld.Peinit
+		return
 	}
 }

src/cmd/link/internal/ld/config.go

@@ -36,7 +36,7 @@ func (mode *BuildMode) Set(s string) error {
 		return fmt.Errorf("invalid buildmode: %q", s)
 	case "exe":
 		switch objabi.GOOS + "/" + objabi.GOARCH {
-		case "darwin/arm64", "windows/arm": // On these platforms, everything is PIE
+		case "darwin/arm64", "windows/arm", "windows/arm64": // On these platforms, everything is PIE
 			*mode = BuildModePIE
 		default:
 			*mode = BuildModeExe
@@ -65,7 +65,7 @@ func (mode *BuildMode) Set(s string) error {
 			}
 		case "windows":
 			switch objabi.GOARCH {
-			case "amd64", "386", "arm":
+			case "amd64", "386", "arm", "arm64":
 			default:
 				return badmode()
 			}
@@ -220,7 +220,7 @@ func mustLinkExternal(ctxt *Link) (res bool, reason string) {
 	case BuildModePIE:
 		switch objabi.GOOS + "/" + objabi.GOARCH {
 		case "linux/amd64", "linux/arm64", "android/arm64":
-		case "windows/386", "windows/amd64", "windows/arm":
+		case "windows/386", "windows/amd64", "windows/arm", "windows/arm64":
 		case "darwin/amd64", "darwin/arm64":
 		default:
 			// Internal linking does not support TLS_IE.

src/cmd/link/internal/ld/deadcode.go

@@ -91,6 +91,10 @@ func (d *deadcodePass) init() {
 		names = append(names, exp)
 	}
 
+	if d.ctxt.Debugvlog > 1 {
+		d.ctxt.Logf("deadcode start names: %v\n", names)
+	}
+
 	for _, name := range names {
 		// Mark symbol as a data/ABI0 symbol.
 		d.mark(d.ldr.Lookup(name, 0), 0)

src/cmd/link/internal/ld/dwarf.go

@@ -1454,7 +1454,7 @@ func (d *dwctxt) writeframes(fs loader.Sym) dwarfSecInfo {
 		// Emit a FDE, Section 6.4.1.
 		// First build the section contents into a byte buffer.
 		deltaBuf = deltaBuf[:0]
-		if haslr && d.ldr.AttrTopFrame(fn) {
+		if haslr && fi.TopFrame() {
 			// Mark the link register as having an undefined value.
 			// This stops call stack unwinders progressing any further.
 			// TODO: similar mark on non-LR architectures.
@@ -1480,7 +1480,7 @@ func (d *dwctxt) writeframes(fs loader.Sym) dwarfSecInfo {
 				spdelta += int64(d.arch.PtrSize)
 			}
 
-			if haslr && !d.ldr.AttrTopFrame(fn) {
+			if haslr && !fi.TopFrame() {
 				// TODO(bryanpkc): This is imprecise. In general, the instruction
 				// that stores the return address to the stack frame is not the
 				// same one that allocates the frame.

src/cmd/link/internal/ld/main.go

@@ -116,7 +116,7 @@ func Main(arch *sys.Arch, theArch Arch) {
 	}
 
 	final := gorootFinal()
-	addstrdata1(ctxt, "runtime/internal/sys.DefaultGoroot="+final)
+	addstrdata1(ctxt, "runtime.defaultGOROOT="+final)
 	addstrdata1(ctxt, "cmd/internal/objabi.defaultGOROOT="+final)
 
 	// TODO(matloob): define these above and then check flag values here

src/cmd/link/internal/ld/pcln.go

@@ -796,7 +796,14 @@ func writeFuncs(ctxt *Link, sb *loader.SymbolBuilder, funcs []loader.Sym, inlSym
 		}
 		off = uint32(sb.SetUint8(ctxt.Arch, int64(off), uint8(funcID)))
 
-		off += 2 // pad
+		// flag uint8
+		var flag objabi.FuncFlag
+		if fi.Valid() {
+			flag = fi.FuncFlag()
+		}
+		off = uint32(sb.SetUint8(ctxt.Arch, int64(off), uint8(flag)))
+
+		off += 1 // pad
 
 		// nfuncdata must be the final entry.
 		funcdata, funcdataoff = funcData(fi, 0, funcdata, funcdataoff)

src/cmd/link/internal/ld/pe.go

@@ -42,11 +42,11 @@ type IMAGE_EXPORT_DIRECTORY struct {
 	AddressOfNameOrdinals uint32
 }
 
-const (
-	PEBASE = 0x00400000
-)
-
 var (
+	// PEBASE is the base address for the executable.
+	// It is small for 32-bit and large for 64-bit.
+	PEBASE int64
+
 	// SectionAlignment must be greater than or equal to FileAlignment.
 	// The default is the page size for the architecture.
 	PESECTALIGN int64 = 0x1000
@@ -69,6 +69,7 @@ const (
 	IMAGE_SCN_ALIGN_32BYTES          = 0x600000
 )
 
+// See https://docs.microsoft.com/en-us/windows/win32/debug/pe-format.
 // TODO(crawshaw): add these constants to debug/pe.
 const (
 	// TODO: the Microsoft doco says IMAGE_SYM_DTYPE_ARRAY is 3 and IMAGE_SYM_DTYPE_FUNCTION is 2
@@ -95,6 +96,25 @@ const (
 	IMAGE_REL_ARM_BRANCH11 = 0x0004
 	IMAGE_REL_ARM_SECREL   = 0x000F
 
+	IMAGE_REL_ARM64_ABSOLUTE       = 0x0000
+	IMAGE_REL_ARM64_ADDR32         = 0x0001
+	IMAGE_REL_ARM64_ADDR32NB       = 0x0002
+	IMAGE_REL_ARM64_BRANCH26       = 0x0003
+	IMAGE_REL_ARM64_PAGEBASE_REL21 = 0x0004
+	IMAGE_REL_ARM64_REL21          = 0x0005
+	IMAGE_REL_ARM64_PAGEOFFSET_12A = 0x0006
+	IMAGE_REL_ARM64_PAGEOFFSET_12L = 0x0007
+	IMAGE_REL_ARM64_SECREL         = 0x0008
+	IMAGE_REL_ARM64_SECREL_LOW12A  = 0x0009
+	IMAGE_REL_ARM64_SECREL_HIGH12A = 0x000A
+	IMAGE_REL_ARM64_SECREL_LOW12L  = 0x000B
+	IMAGE_REL_ARM64_TOKEN          = 0x000C
+	IMAGE_REL_ARM64_SECTION        = 0x000D
+	IMAGE_REL_ARM64_ADDR64         = 0x000E
+	IMAGE_REL_ARM64_BRANCH19       = 0x000F
+	IMAGE_REL_ARM64_BRANCH14       = 0x0010
+	IMAGE_REL_ARM64_REL32          = 0x0011
+
 	IMAGE_REL_BASED_HIGHLOW = 3
 	IMAGE_REL_BASED_DIR64   = 10
 )
@@ -316,8 +336,8 @@ func (sect *peSection) checkOffset(off int64) {
 // checkSegment verifies COFF section sect matches address
 // and file offset provided in segment seg.
 func (sect *peSection) checkSegment(seg *sym.Segment) {
-	if seg.Vaddr-PEBASE != uint64(sect.virtualAddress) {
+	if seg.Vaddr-uint64(PEBASE) != uint64(sect.virtualAddress) {
-		Errorf(nil, "%s.VirtualAddress = %#x, want %#x", sect.name, uint64(int64(sect.virtualAddress)), uint64(int64(seg.Vaddr-PEBASE)))
+		Errorf(nil, "%s.VirtualAddress = %#x, want %#x", sect.name, uint64(int64(sect.virtualAddress)), uint64(int64(seg.Vaddr-uint64(PEBASE))))
 		errorexit()
 	}
 	if seg.Fileoff != uint64(sect.pointerToRawData) {
@@ -465,6 +485,8 @@ func (f *peFile) addInitArray(ctxt *Link) *peSection {
 		size = 8
 	case "arm":
 		size = 4
+	case "arm64":
+		size = 8
 	}
 	sect := f.addSection(".ctors", size, size)
 	sect.characteristics = IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_READ
@@ -477,7 +499,7 @@ func (f *peFile) addInitArray(ctxt *Link) *peSection {
 	switch objabi.GOARCH {
 	case "386", "arm":
 		ctxt.Out.Write32(uint32(addr))
-	case "amd64":
+	case "amd64", "arm64":
 		ctxt.Out.Write64(addr)
 	}
 	return sect
@@ -594,6 +616,8 @@ dwarfLoop:
 			ctxt.Out.Write16(IMAGE_REL_AMD64_ADDR64)
 		case "arm":
 			ctxt.Out.Write16(IMAGE_REL_ARM_ADDR32)
+		case "arm64":
+			ctxt.Out.Write16(IMAGE_REL_ARM64_ADDR64)
 		}
 		return 1
 	})
@@ -788,6 +812,8 @@ func (f *peFile) writeFileHeader(ctxt *Link) {
 		fh.Machine = pe.IMAGE_FILE_MACHINE_I386
 	case sys.ARM:
 		fh.Machine = pe.IMAGE_FILE_MACHINE_ARMNT
+	case sys.ARM64:
+		fh.Machine = pe.IMAGE_FILE_MACHINE_ARM64
 	}
 
 	fh.NumberOfSections = uint16(len(f.sections))
@@ -852,8 +878,8 @@ func (f *peFile) writeOptionalHeader(ctxt *Link) {
 	}
 	oh64.BaseOfCode = f.textSect.virtualAddress
 	oh.BaseOfCode = f.textSect.virtualAddress
-	oh64.ImageBase = PEBASE
+	oh64.ImageBase = uint64(PEBASE)
-	oh.ImageBase = PEBASE
+	oh.ImageBase = uint32(PEBASE)
 	oh64.SectionAlignment = uint32(PESECTALIGN)
 	oh.SectionAlignment = uint32(PESECTALIGN)
 	oh64.FileAlignment = uint32(PEFILEALIGN)
@@ -891,13 +917,7 @@ func (f *peFile) writeOptionalHeader(ctxt *Link) {
 	oh.DllCharacteristics |= pe.IMAGE_DLLCHARACTERISTICS_NX_COMPAT
 
 	// The DLL can be relocated at load time.
-	switch ctxt.Arch.Family {
+	if needPEBaseReloc(ctxt) {
-	case sys.AMD64, sys.I386:
-		if ctxt.BuildMode == BuildModePIE {
-			oh64.DllCharacteristics |= pe.IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE
-			oh.DllCharacteristics |= pe.IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE
-		}
-	case sys.ARM:
 		oh64.DllCharacteristics |= pe.IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE
 		oh.DllCharacteristics |= pe.IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE
 	}
@@ -975,18 +995,23 @@ var pefile peFile
 func Peinit(ctxt *Link) {
 	var l int
 
-	switch ctxt.Arch.Family {
+	if ctxt.Arch.PtrSize == 8 {
 		// 64-bit architectures
-	case sys.AMD64:
 		pe64 = 1
+		PEBASE = 1 << 32
+		if ctxt.Arch.Family == sys.AMD64 {
+			// TODO(rsc): For cgo we currently use 32-bit relocations
+			// that fail when PEBASE is too large.
+			// We need to fix this, but for now, use a smaller PEBASE.
+			PEBASE = 1 << 22
+		}
 		var oh64 pe.OptionalHeader64
 		l = binary.Size(&oh64)
-
+	} else {
 		// 32-bit architectures
-	default:
+		PEBASE = 1 << 22
 		var oh pe.OptionalHeader32
 		l = binary.Size(&oh)
-
 	}
 
 	if ctxt.LinkMode == LinkExternal {
@@ -1210,7 +1235,7 @@ func addimports(ctxt *Link, datsect *peSection) {
 	endoff := ctxt.Out.Offset()
 
 	// write FirstThunks (allocated in .data section)
-	ftbase := uint64(ldr.SymValue(dynamic)) - uint64(datsect.virtualAddress) - PEBASE
+	ftbase := uint64(ldr.SymValue(dynamic)) - uint64(datsect.virtualAddress) - uint64(PEBASE)
 
 	ctxt.Out.SeekSet(int64(uint64(datsect.pointerToRawData) + ftbase))
 	for d := dr; d != nil; d = d.next {
@@ -1463,17 +1488,18 @@ func addPEBaseRelocSym(ldr *loader.Loader, s loader.Sym, rt *peBaseRelocTable) {
 	}
 }
 
-func addPEBaseReloc(ctxt *Link) {
+func needPEBaseReloc(ctxt *Link) bool {
-	// Arm does not work without base relocation table.
+	// Non-PIE x86 binaries don't need the base relocation table.
-	// 386 and amd64 will only require the table for BuildModePIE.
+	// Everyone else does.
-	switch ctxt.Arch.Family {
+	if (ctxt.Arch.Family == sys.I386 || ctxt.Arch.Family == sys.AMD64) && ctxt.BuildMode != BuildModePIE {
-	default:
+		return false
-		return
-	case sys.I386, sys.AMD64:
-		if ctxt.BuildMode != BuildModePIE {
-			return
 	}
-	case sys.ARM:
+	return true
+}
+
+func addPEBaseReloc(ctxt *Link) {
+	if !needPEBaseReloc(ctxt) {
+		return
 	}
 
 	var rt peBaseRelocTable
@@ -1562,12 +1588,6 @@ func addpersrc(ctxt *Link) {
 }
 
 func asmbPe(ctxt *Link) {
-	switch ctxt.Arch.Family {
-	default:
-		Exitf("unknown PE architecture: %v", ctxt.Arch.Family)
-	case sys.AMD64, sys.I386, sys.ARM:
-	}
-
 	t := pefile.addSection(".text", int(Segtext.Length), int(Segtext.Length))
 	t.characteristics = IMAGE_SCN_CNT_CODE | IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_EXECUTE | IMAGE_SCN_MEM_READ
 	if ctxt.LinkMode == LinkExternal {

src/cmd/link/internal/loader/loader.go

@@ -241,7 +241,6 @@ type Loader struct {
 	attrExternal         Bitmap // external symbols, indexed by ext sym index
 
 	attrReadOnly         map[Sym]bool     // readonly data for this sym
-	attrTopFrame         map[Sym]struct{} // top frame symbols
 	attrSpecial          map[Sym]struct{} // "special" frame symbols
 	attrCgoExportDynamic map[Sym]struct{} // "cgo_export_dynamic" symbols
 	attrCgoExportStatic  map[Sym]struct{} // "cgo_export_static" symbols
@@ -349,7 +348,6 @@ func NewLoader(flags uint32, elfsetstring elfsetstringFunc, reporter *ErrorRepor
 		plt:                  make(map[Sym]int32),
 		got:                  make(map[Sym]int32),
 		dynid:                make(map[Sym]int32),
-		attrTopFrame:         make(map[Sym]struct{}),
 		attrSpecial:          make(map[Sym]struct{}),
 		attrCgoExportDynamic: make(map[Sym]struct{}),
 		attrCgoExportStatic:  make(map[Sym]struct{}),
@@ -1009,24 +1007,6 @@ func (l *Loader) SetAttrExternal(i Sym, v bool) {
 	}
 }
 
-// AttrTopFrame returns true for a function symbol that is an entry
-// point, meaning that unwinders should stop when they hit this
-// function.
-func (l *Loader) AttrTopFrame(i Sym) bool {
-	_, ok := l.attrTopFrame[i]
-	return ok
-}
-
-// SetAttrTopFrame sets the "top frame" property for a symbol (see
-// AttrTopFrame).
-func (l *Loader) SetAttrTopFrame(i Sym, v bool) {
-	if v {
-		l.attrTopFrame[i] = struct{}{}
-	} else {
-		delete(l.attrTopFrame, i)
-	}
-}
-
 // AttrSpecial returns true for a symbols that do not have their
 // address (i.e. Value) computed by the usual mechanism of
 // data.go:dodata() & data.go:address().
@@ -1905,7 +1885,11 @@ func (fi *FuncInfo) Locals() int {
 }
 
 func (fi *FuncInfo) FuncID() objabi.FuncID {
-	return objabi.FuncID((*goobj.FuncInfo)(nil).ReadFuncID(fi.data))
+	return (*goobj.FuncInfo)(nil).ReadFuncID(fi.data)
+}
+
+func (fi *FuncInfo) FuncFlag() objabi.FuncFlag {
+	return (*goobj.FuncInfo)(nil).ReadFuncFlag(fi.data)
 }
 
 func (fi *FuncInfo) Pcsp() Sym {
@@ -1992,6 +1976,13 @@ func (fi *FuncInfo) File(k int) goobj.CUFileIndex {
 	return (*goobj.FuncInfo)(nil).ReadFile(fi.data, fi.lengths.FileOff, uint32(k))
 }
 
+// TopFrame returns true if the function associated with this FuncInfo
+// is an entry point, meaning that unwinders should stop when they hit
+// this function.
+func (fi *FuncInfo) TopFrame() bool {
+	return (fi.FuncFlag() & objabi.FuncFlag_TOPFRAME) != 0
+}
+
 type InlTreeNode struct {
 	Parent   int32
 	File     goobj.CUFileIndex
@@ -2151,9 +2142,6 @@ func (st *loadState) preloadSyms(r *oReader, kind int) {
 		}
 		gi := st.addSym(name, v, r, i, kind, osym)
 		r.syms[i] = gi
-		if osym.TopFrame() {
-			l.SetAttrTopFrame(gi, true)
-		}
 		if osym.Local() {
 			l.SetAttrLocal(gi, true)
 		}
@@ -2411,7 +2399,6 @@ func (l *Loader) CopyAttributes(src Sym, dst Sym) {
 		// when copying attributes from a dupOK ABI wrapper symbol to
 		// the real target symbol (which may not be marked dupOK).
 	}
-	l.SetAttrTopFrame(dst, l.AttrTopFrame(src))
 	l.SetAttrSpecial(dst, l.AttrSpecial(src))
 	l.SetAttrCgoExportDynamic(dst, l.AttrCgoExportDynamic(src))
 	l.SetAttrCgoExportStatic(dst, l.AttrCgoExportStatic(src))

src/cmd/vendor/golang.org/x/sys/unix/mkerrors.sh

@@ -65,6 +65,7 @@ includes_Darwin='
 #include <sys/ptrace.h>
 #include <sys/select.h>
 #include <sys/socket.h>
+#include <sys/un.h>
 #include <sys/sockio.h>
 #include <sys/sys_domain.h>
 #include <sys/sysctl.h>
@@ -204,6 +205,7 @@ struct ltchars {
 #include <linux/devlink.h>
 #include <linux/dm-ioctl.h>
 #include <linux/errqueue.h>
+#include <linux/ethtool_netlink.h>
 #include <linux/falloc.h>
 #include <linux/fanotify.h>
 #include <linux/filter.h>
@@ -479,7 +481,7 @@ ccflags="$@"
 		$2 ~ /^LOCK_(SH|EX|NB|UN)$/ ||
 		$2 ~ /^LO_(KEY|NAME)_SIZE$/ ||
 		$2 ~ /^LOOP_(CLR|CTL|GET|SET)_/ ||
-		$2 ~ /^(AF|SOCK|SO|SOL|IPPROTO|IP|IPV6|ICMP6|TCP|MCAST|EVFILT|NOTE|EV|SHUT|PROT|MAP|MFD|T?PACKET|MSG|SCM|MCL|DT|MADV|PR)_/ ||
+		$2 ~ /^(AF|SOCK|SO|SOL|IPPROTO|IP|IPV6|ICMP6|TCP|MCAST|EVFILT|NOTE|EV|SHUT|PROT|MAP|MFD|T?PACKET|MSG|SCM|MCL|DT|MADV|PR|LOCAL)_/ ||
 		$2 ~ /^TP_STATUS_/ ||
 		$2 ~ /^FALLOC_/ ||
 		$2 == "ICMPV6_FILTER" ||
@@ -561,7 +563,9 @@ ccflags="$@"
 		$2 ~ /^(HDIO|WIN|SMART)_/ ||
 		$2 ~ /^CRYPTO_/ ||
 		$2 ~ /^TIPC_/ ||
+		$2 !~  "DEVLINK_RELOAD_LIMITS_VALID_MASK" &&
 		$2 ~ /^DEVLINK_/ ||
+		$2 ~ /^ETHTOOL_/ ||
 		$2 ~ /^LWTUNNEL_IP/ ||
 		$2 !~ "WMESGLEN" &&
 		$2 ~ /^W[A-Z0-9]+$/ ||

src/cmd/vendor/golang.org/x/sys/unix/ptrace_darwin.go

@@ -0,0 +1,11 @@
+// Copyright 2020 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.
+
+// +build darwin,!ios
+
+package unix
+
+func ptrace(request int, pid int, addr uintptr, data uintptr) error {
+	return ptrace1(request, pid, addr, data)
+}

src/cmd/vendor/golang.org/x/sys/unix/ptrace_ios.go

@@ -0,0 +1,11 @@
+// Copyright 2020 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.
+
+// +build ios
+
+package unix
+
+func ptrace(request int, pid int, addr uintptr, data uintptr) (err error) {
+	return ENOTSUP
+}

src/cmd/vendor/golang.org/x/sys/unix/syscall_darwin.go

@@ -119,13 +119,16 @@ type attrList struct {
 	Forkattr    uint32
 }
 
-//sysnb pipe() (r int, w int, err error)
+//sysnb	pipe(p *[2]int32) (err error)
 
 func Pipe(p []int) (err error) {
 	if len(p) != 2 {
 		return EINVAL
 	}
-	p[0], p[1], err = pipe()
+	var x [2]int32
+	err = pipe(&x)
+	p[0] = int(x[0])
+	p[1] = int(x[1])
 	return
 }
 
@@ -375,6 +378,15 @@ func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err e
 	return
 }
 
+// GetsockoptXucred is a getsockopt wrapper that returns an Xucred struct.
+// The usual level and opt are SOL_LOCAL and LOCAL_PEERCRED, respectively.
+func GetsockoptXucred(fd, level, opt int) (*Xucred, error) {
+	x := new(Xucred)
+	vallen := _Socklen(unsafe.Sizeof(Xucred{}))
+	err := getsockopt(fd, level, opt, unsafe.Pointer(x), &vallen)
+	return x, err
+}
+
 //sys	sendfile(infd int, outfd int, offset int64, len *int64, hdtr unsafe.Pointer, flags int) (err error)
 
 /*

src/cmd/vendor/golang.org/x/sys/unix/syscall_darwin_386.go

@@ -45,6 +45,6 @@ func Syscall9(num, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr,
 //sys	Fstatfs(fd int, stat *Statfs_t) (err error) = SYS_FSTATFS64
 //sys	getfsstat(buf unsafe.Pointer, size uintptr, flags int) (n int, err error) = SYS_GETFSSTAT64
 //sys	Lstat(path string, stat *Stat_t) (err error) = SYS_LSTAT64
-//sys	ptrace(request int, pid int, addr uintptr, data uintptr) (err error)
+//sys	ptrace1(request int, pid int, addr uintptr, data uintptr) (err error) = SYS_ptrace
 //sys	Stat(path string, stat *Stat_t) (err error) = SYS_STAT64
 //sys	Statfs(path string, stat *Statfs_t) (err error) = SYS_STATFS64

src/cmd/vendor/golang.org/x/sys/unix/syscall_darwin_amd64.go

@@ -45,6 +45,6 @@ func Syscall9(num, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr,
 //sys	Fstatfs(fd int, stat *Statfs_t) (err error) = SYS_FSTATFS64
 //sys	getfsstat(buf unsafe.Pointer, size uintptr, flags int) (n int, err error) = SYS_GETFSSTAT64
 //sys	Lstat(path string, stat *Stat_t) (err error) = SYS_LSTAT64
-//sys	ptrace(request int, pid int, addr uintptr, data uintptr) (err error)
+//sys	ptrace1(request int, pid int, addr uintptr, data uintptr) (err error) = SYS_ptrace
 //sys	Stat(path string, stat *Stat_t) (err error) = SYS_STAT64
 //sys	Statfs(path string, stat *Statfs_t) (err error) = SYS_STATFS64

src/cmd/vendor/golang.org/x/sys/unix/syscall_darwin_arm.go

@@ -6,7 +6,7 @@ package unix
 
 import "syscall"
 
-func ptrace(request int, pid int, addr uintptr, data uintptr) error {
+func ptrace1(request int, pid int, addr uintptr, data uintptr) error {
 	return ENOTSUP
 }
 

src/cmd/vendor/golang.org/x/sys/unix/syscall_darwin_arm64.go

@@ -45,6 +45,6 @@ func Syscall9(num, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr,
 //sys	Fstatfs(fd int, stat *Statfs_t) (err error)
 //sys	getfsstat(buf unsafe.Pointer, size uintptr, flags int) (n int, err error) = SYS_GETFSSTAT
 //sys	Lstat(path string, stat *Stat_t) (err error)
-//sys	ptrace(request int, pid int, addr uintptr, data uintptr) (err error)
+//sys	ptrace1(request int, pid int, addr uintptr, data uintptr) (err error) = SYS_ptrace
 //sys	Stat(path string, stat *Stat_t) (err error)
 //sys	Statfs(path string, stat *Statfs_t) (err error)

src/cmd/vendor/golang.org/x/sys/unix/syscall_dragonfly.go

@@ -105,16 +105,13 @@ func Pipe(p []int) (err error) {
 	return
 }
 
-//sysnb	pipe2(p *[2]_C_int, flags int) (err error)
+//sysnb	pipe2(flags int) (r int, w int, err error)
 
-func Pipe2(p []int, flags int) error {
+func Pipe2(p []int, flags int) (err error) {
 	if len(p) != 2 {
 		return EINVAL
 	}
-	var pp [2]_C_int
+	p[0], p[1], err = pipe2(flags)
-	err := pipe2(&pp, flags)
-	p[0] = int(pp[0])
-	p[1] = int(pp[1])
 	return err
 }
 

src/cmd/vendor/golang.org/x/sys/unix/syscall_illumos.go

@@ -75,16 +75,3 @@ func Accept4(fd int, flags int) (nfd int, sa Sockaddr, err error) {
 	}
 	return
 }
-
-//sysnb	pipe2(p *[2]_C_int, flags int) (err error)
-
-func Pipe2(p []int, flags int) error {
-	if len(p) != 2 {
-		return EINVAL
-	}
-	var pp [2]_C_int
-	err := pipe2(&pp, flags)
-	p[0] = int(pp[0])
-	p[1] = int(pp[1])
-	return err
-}

src/cmd/vendor/golang.org/x/sys/unix/syscall_netbsd.go

@@ -111,6 +111,7 @@ func direntNamlen(buf []byte) (uint64, bool) {
 }
 
 //sysnb	pipe() (fd1 int, fd2 int, err error)
+
 func Pipe(p []int) (err error) {
 	if len(p) != 2 {
 		return EINVAL
@@ -119,7 +120,21 @@ func Pipe(p []int) (err error) {
 	return
 }
 
+//sysnb	pipe2(p *[2]_C_int, flags int) (err error)
+
+func Pipe2(p []int, flags int) error {
+	if len(p) != 2 {
+		return EINVAL
+	}
+	var pp [2]_C_int
+	err := pipe2(&pp, flags)
+	p[0] = int(pp[0])
+	p[1] = int(pp[1])
+	return err
+}
+
 //sys	Getdents(fd int, buf []byte) (n int, err error)
+
 func Getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) {
 	n, err = Getdents(fd, buf)
 	if err != nil || basep == nil {

src/cmd/vendor/golang.org/x/sys/unix/syscall_solaris.go

@@ -68,6 +68,19 @@ func Pipe(p []int) (err error) {
 	return nil
 }
 
+//sysnb	pipe2(p *[2]_C_int, flags int) (err error)
+
+func Pipe2(p []int, flags int) error {
+	if len(p) != 2 {
+		return EINVAL
+	}
+	var pp [2]_C_int
+	err := pipe2(&pp, flags)
+	p[0] = int(pp[0])
+	p[1] = int(pp[1])
+	return err
+}
+
 func (sa *SockaddrInet4) sockaddr() (unsafe.Pointer, _Socklen, error) {
 	if sa.Port < 0 || sa.Port > 0xFFFF {
 		return nil, 0, EINVAL
@@ -669,6 +682,7 @@ func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err e
 //sys	Statvfs(path string, vfsstat *Statvfs_t) (err error)
 //sys	Symlink(path string, link string) (err error)
 //sys	Sync() (err error)
+//sys	Sysconf(which int) (n int64, err error)
 //sysnb	Times(tms *Tms) (ticks uintptr, err error)
 //sys	Truncate(path string, length int64) (err error)
 //sys	Fsync(fd int) (err error)

src/cmd/vendor/golang.org/x/sys/unix/timestruct.go

@@ -8,12 +8,10 @@ package unix
 
 import "time"
 
-// TimespecToNsec converts a Timespec value into a number of
+// TimespecToNSec returns the time stored in ts as nanoseconds.
-// nanoseconds since the Unix epoch.
+func TimespecToNsec(ts Timespec) int64 { return ts.Nano() }
-func TimespecToNsec(ts Timespec) int64 { return int64(ts.Sec)*1e9 + int64(ts.Nsec) }
 
-// NsecToTimespec takes a number of nanoseconds since the Unix epoch
+// NsecToTimespec converts a number of nanoseconds into a Timespec.
-// and returns the corresponding Timespec value.
 func NsecToTimespec(nsec int64) Timespec {
 	sec := nsec / 1e9
 	nsec = nsec % 1e9
@@ -42,12 +40,10 @@ func TimeToTimespec(t time.Time) (Timespec, error) {
 	return ts, nil
 }
 
-// TimevalToNsec converts a Timeval value into a number of nanoseconds
+// TimevalToNsec returns the time stored in tv as nanoseconds.
-// since the Unix epoch.
+func TimevalToNsec(tv Timeval) int64 { return tv.Nano() }
-func TimevalToNsec(tv Timeval) int64 { return int64(tv.Sec)*1e9 + int64(tv.Usec)*1e3 }
 
-// NsecToTimeval takes a number of nanoseconds since the Unix epoch
+// NsecToTimeval converts a number of nanoseconds into a Timeval.
-// and returns the corresponding Timeval value.
 func NsecToTimeval(nsec int64) Timeval {
 	nsec += 999 // round up to microsecond
 	usec := nsec % 1e9 / 1e3
@@ -59,24 +55,22 @@ func NsecToTimeval(nsec int64) Timeval {
 	return setTimeval(sec, usec)
 }
 
-// Unix returns ts as the number of seconds and nanoseconds elapsed since the
+// Unix returns the time stored in ts as seconds plus nanoseconds.
-// Unix epoch.
 func (ts *Timespec) Unix() (sec int64, nsec int64) {
 	return int64(ts.Sec), int64(ts.Nsec)
 }
 
-// Unix returns tv as the number of seconds and nanoseconds elapsed since the
+// Unix returns the time stored in tv as seconds plus nanoseconds.
-// Unix epoch.
 func (tv *Timeval) Unix() (sec int64, nsec int64) {
 	return int64(tv.Sec), int64(tv.Usec) * 1000
 }
 
-// Nano returns ts as the number of nanoseconds elapsed since the Unix epoch.
+// Nano returns the time stored in ts as nanoseconds.
 func (ts *Timespec) Nano() int64 {
 	return int64(ts.Sec)*1e9 + int64(ts.Nsec)
 }
 
-// Nano returns tv as the number of nanoseconds elapsed since the Unix epoch.
+// Nano returns the time stored in tv as nanoseconds.
 func (tv *Timeval) Nano() int64 {
 	return int64(tv.Sec)*1e9 + int64(tv.Usec)*1000
 }

src/cmd/vendor/golang.org/x/sys/unix/zerrors_darwin_amd64.go

@@ -32,7 +32,7 @@ const (
 	AF_LAT                            = 0xe
 	AF_LINK                           = 0x12
 	AF_LOCAL                          = 0x1
-	AF_MAX                            = 0x28
+	AF_MAX                            = 0x29
 	AF_NATM                           = 0x1f
 	AF_NDRV                           = 0x1b
 	AF_NETBIOS                        = 0x21
@@ -49,6 +49,7 @@ const (
 	AF_UNIX                           = 0x1
 	AF_UNSPEC                         = 0x0
 	AF_UTUN                           = 0x26
+	AF_VSOCK                          = 0x28
 	ALTWERASE                         = 0x200
 	ATTR_BIT_MAP_COUNT                = 0x5
 	ATTR_CMN_ACCESSMASK               = 0x20000
@@ -83,7 +84,7 @@ const (
 	ATTR_CMN_PAROBJID                 = 0x80
 	ATTR_CMN_RETURNED_ATTRS           = 0x80000000
 	ATTR_CMN_SCRIPT                   = 0x100
-	ATTR_CMN_SETMASK                  = 0x41c7ff00
+	ATTR_CMN_SETMASK                  = 0x51c7ff00
 	ATTR_CMN_USERACCESS               = 0x200000
 	ATTR_CMN_UUID                     = 0x800000
 	ATTR_CMN_VALIDMASK                = 0xffffffff
@@ -357,7 +358,7 @@ const (
 	DLT_LINUX_SLL                     = 0x71
 	DLT_LOOP                          = 0x6c
 	DLT_LTALK                         = 0x72
-	DLT_MATCHING_MAX                  = 0xf5
+	DLT_MATCHING_MAX                  = 0x10a
 	DLT_MATCHING_MIN                  = 0x68
 	DLT_MFR                           = 0xb6
 	DLT_MOST                          = 0xd3
@@ -398,6 +399,7 @@ const (
 	DLT_SYMANTEC_FIREWALL             = 0x63
 	DLT_TZSP                          = 0x80
 	DLT_USB                           = 0xba
+	DLT_USB_DARWIN                    = 0x10a
 	DLT_USB_LINUX                     = 0xbd
 	DLT_USB_LINUX_MMAPPED             = 0xdc
 	DLT_USER0                         = 0x93
@@ -442,8 +444,8 @@ const (
 	EVFILT_PROC                       = -0x5
 	EVFILT_READ                       = -0x1
 	EVFILT_SIGNAL                     = -0x6
-	EVFILT_SYSCOUNT                   = 0xf
+	EVFILT_SYSCOUNT                   = 0x11
-	EVFILT_THREADMARKER               = 0xf
+	EVFILT_THREADMARKER               = 0x11
 	EVFILT_TIMER                      = -0x7
 	EVFILT_USER                       = -0xa
 	EVFILT_VM                         = -0xc
@@ -481,9 +483,12 @@ const (
 	FSOPT_NOINMEMUPDATE               = 0x2
 	FSOPT_PACK_INVAL_ATTRS            = 0x8
 	FSOPT_REPORT_FULLSIZE             = 0x4
+	FSOPT_RETURN_REALDEV              = 0x200
 	F_ADDFILESIGS                     = 0x3d
 	F_ADDFILESIGS_FOR_DYLD_SIM        = 0x53
+	F_ADDFILESIGS_INFO                = 0x67
 	F_ADDFILESIGS_RETURN              = 0x61
+	F_ADDFILESUPPL                    = 0x68
 	F_ADDSIGS                         = 0x3b
 	F_ALLOCATEALL                     = 0x4
 	F_ALLOCATECONTIG                  = 0x2
@@ -505,8 +510,10 @@ const (
 	F_GETOWN                          = 0x5
 	F_GETPATH                         = 0x32
 	F_GETPATH_MTMINFO                 = 0x47
+	F_GETPATH_NOFIRMLINK              = 0x66
 	F_GETPROTECTIONCLASS              = 0x3f
 	F_GETPROTECTIONLEVEL              = 0x4d
+	F_GETSIGSINFO                     = 0x69
 	F_GLOBAL_NOCACHE                  = 0x37
 	F_LOG2PHYS                        = 0x31
 	F_LOG2PHYS_EXT                    = 0x41
@@ -531,6 +538,7 @@ const (
 	F_SETPROTECTIONCLASS              = 0x40
 	F_SETSIZE                         = 0x2b
 	F_SINGLE_WRITER                   = 0x4c
+	F_SPECULATIVE_READ                = 0x65
 	F_THAW_FS                         = 0x36
 	F_TRANSCODEKEY                    = 0x4b
 	F_TRIM_ACTIVE_FILE                = 0x64
@@ -562,6 +570,7 @@ const (
 	IFF_UP                            = 0x1
 	IFNAMSIZ                          = 0x10
 	IFT_1822                          = 0x2
+	IFT_6LOWPAN                       = 0x40
 	IFT_AAL5                          = 0x31
 	IFT_ARCNET                        = 0x23
 	IFT_ARCNETPLUS                    = 0x24
@@ -766,6 +775,9 @@ const (
 	IPV6_2292PKTINFO                  = 0x13
 	IPV6_2292PKTOPTIONS               = 0x19
 	IPV6_2292RTHDR                    = 0x18
+	IPV6_ADDR_MC_FLAGS_PREFIX         = 0x20
+	IPV6_ADDR_MC_FLAGS_TRANSIENT      = 0x10
+	IPV6_ADDR_MC_FLAGS_UNICAST_BASED  = 0x30
 	IPV6_BINDV6ONLY                   = 0x1b
 	IPV6_BOUND_IF                     = 0x7d
 	IPV6_CHECKSUM                     = 0x1a
@@ -775,7 +787,7 @@ const (
 	IPV6_FAITH                        = 0x1d
 	IPV6_FLOWINFO_MASK                = 0xffffff0f
 	IPV6_FLOWLABEL_MASK               = 0xffff0f00
-	IPV6_FLOW_ECN_MASK                = 0x300
+	IPV6_FLOW_ECN_MASK                = 0x3000
 	IPV6_FRAGTTL                      = 0x3c
 	IPV6_FW_ADD                       = 0x1e
 	IPV6_FW_DEL                       = 0x1f
@@ -818,6 +830,7 @@ const (
 	IP_DEFAULT_MULTICAST_LOOP         = 0x1
 	IP_DEFAULT_MULTICAST_TTL          = 0x1
 	IP_DF                             = 0x4000
+	IP_DONTFRAG                       = 0x1c
 	IP_DROP_MEMBERSHIP                = 0xd
 	IP_DROP_SOURCE_MEMBERSHIP         = 0x47
 	IP_DUMMYNET_CONFIGURE             = 0x3c
@@ -889,6 +902,12 @@ const (
 	KERN_OSRELEASE                    = 0x2
 	KERN_OSTYPE                       = 0x1
 	KERN_VERSION                      = 0x4
+	LOCAL_PEERCRED                    = 0x1
+	LOCAL_PEEREPID                    = 0x3
+	LOCAL_PEEREUUID                   = 0x5
+	LOCAL_PEERPID                     = 0x2
+	LOCAL_PEERTOKEN                   = 0x6
+	LOCAL_PEERUUID                    = 0x4
 	LOCK_EX                           = 0x2
 	LOCK_NB                           = 0x4
 	LOCK_SH                           = 0x1
@@ -904,6 +923,7 @@ const (
 	MADV_SEQUENTIAL                   = 0x2
 	MADV_WILLNEED                     = 0x3
 	MADV_ZERO_WIRED_PAGES             = 0x6
+	MAP_32BIT                         = 0x8000
 	MAP_ANON                          = 0x1000
 	MAP_ANONYMOUS                     = 0x1000
 	MAP_COPY                          = 0x2
@@ -920,6 +940,17 @@ const (
 	MAP_RESILIENT_CODESIGN            = 0x2000
 	MAP_RESILIENT_MEDIA               = 0x4000
 	MAP_SHARED                        = 0x1
+	MAP_TRANSLATED_ALLOW_EXECUTE      = 0x20000
+	MAP_UNIX03                        = 0x40000
+	MCAST_BLOCK_SOURCE                = 0x54
+	MCAST_EXCLUDE                     = 0x2
+	MCAST_INCLUDE                     = 0x1
+	MCAST_JOIN_GROUP                  = 0x50
+	MCAST_JOIN_SOURCE_GROUP           = 0x52
+	MCAST_LEAVE_GROUP                 = 0x51
+	MCAST_LEAVE_SOURCE_GROUP          = 0x53
+	MCAST_UNBLOCK_SOURCE              = 0x55
+	MCAST_UNDEFINED                   = 0x0
 	MCL_CURRENT                       = 0x1
 	MCL_FUTURE                        = 0x2
 	MNT_ASYNC                         = 0x40
@@ -931,6 +962,7 @@ const (
 	MNT_DOVOLFS                       = 0x8000
 	MNT_DWAIT                         = 0x4
 	MNT_EXPORTED                      = 0x100
+	MNT_EXT_ROOT_DATA_VOL             = 0x1
 	MNT_FORCE                         = 0x80000
 	MNT_IGNORE_OWNERSHIP              = 0x200000
 	MNT_JOURNALED                     = 0x800000
@@ -947,12 +979,15 @@ const (
 	MNT_QUOTA                         = 0x2000
 	MNT_RDONLY                        = 0x1
 	MNT_RELOAD                        = 0x40000
+	MNT_REMOVABLE                     = 0x200
 	MNT_ROOTFS                        = 0x4000
+	MNT_SNAPSHOT                      = 0x40000000
+	MNT_STRICTATIME                   = 0x80000000
 	MNT_SYNCHRONOUS                   = 0x2
 	MNT_UNION                         = 0x20
 	MNT_UNKNOWNPERMISSIONS            = 0x200000
 	MNT_UPDATE                        = 0x10000
-	MNT_VISFLAGMASK                   = 0x17f0f5ff
+	MNT_VISFLAGMASK                   = 0xd7f0f7ff
 	MNT_WAIT                          = 0x1
 	MSG_CTRUNC                        = 0x20
 	MSG_DONTROUTE                     = 0x4
@@ -963,6 +998,7 @@ const (
 	MSG_HAVEMORE                      = 0x2000
 	MSG_HOLD                          = 0x800
 	MSG_NEEDSA                        = 0x10000
+	MSG_NOSIGNAL                      = 0x80000
 	MSG_OOB                           = 0x1
 	MSG_PEEK                          = 0x2
 	MSG_RCVMORE                       = 0x4000
@@ -979,9 +1015,10 @@ const (
 	NET_RT_DUMP                       = 0x1
 	NET_RT_DUMP2                      = 0x7
 	NET_RT_FLAGS                      = 0x2
+	NET_RT_FLAGS_PRIV                 = 0xa
 	NET_RT_IFLIST                     = 0x3
 	NET_RT_IFLIST2                    = 0x6
-	NET_RT_MAXID                      = 0xa
+	NET_RT_MAXID                      = 0xb
 	NET_RT_STAT                       = 0x4
 	NET_RT_TRASH                      = 0x5
 	NFDBITS                           = 0x20
@@ -1019,6 +1056,7 @@ const (
 	NOTE_LEEWAY                       = 0x10
 	NOTE_LINK                         = 0x10
 	NOTE_LOWAT                        = 0x1
+	NOTE_MACHTIME                     = 0x100
 	NOTE_MACH_CONTINUOUS_TIME         = 0x80
 	NOTE_NONE                         = 0x80
 	NOTE_NSECONDS                     = 0x4
@@ -1065,6 +1103,7 @@ const (
 	O_NDELAY                          = 0x4
 	O_NOCTTY                          = 0x20000
 	O_NOFOLLOW                        = 0x100
+	O_NOFOLLOW_ANY                    = 0x20000000
 	O_NONBLOCK                        = 0x4
 	O_POPUP                           = 0x80000000
 	O_RDONLY                          = 0x0
@@ -1136,6 +1175,7 @@ const (
 	RTF_BROADCAST                     = 0x400000
 	RTF_CLONING                       = 0x100
 	RTF_CONDEMNED                     = 0x2000000
+	RTF_DEAD                          = 0x20000000
 	RTF_DELCLONE                      = 0x80
 	RTF_DONE                          = 0x40
 	RTF_DYNAMIC                       = 0x10
@@ -1143,6 +1183,7 @@ const (
 	RTF_HOST                          = 0x4
 	RTF_IFREF                         = 0x4000000
 	RTF_IFSCOPE                       = 0x1000000
+	RTF_LLDATA                        = 0x400
 	RTF_LLINFO                        = 0x400
 	RTF_LOCAL                         = 0x200000
 	RTF_MODIFIED                      = 0x20
@@ -1210,6 +1251,7 @@ const (
 	SIOCGDRVSPEC                      = 0xc028697b
 	SIOCGETVLAN                       = 0xc020697f
 	SIOCGHIWAT                        = 0x40047301
+	SIOCGIF6LOWPAN                    = 0xc02069c5
 	SIOCGIFADDR                       = 0xc0206921
 	SIOCGIFALTMTU                     = 0xc0206948
 	SIOCGIFASYNCMAP                   = 0xc020697c
@@ -1220,6 +1262,7 @@ const (
 	SIOCGIFDEVMTU                     = 0xc0206944
 	SIOCGIFDSTADDR                    = 0xc0206922
 	SIOCGIFFLAGS                      = 0xc0206911
+	SIOCGIFFUNCTIONALTYPE             = 0xc02069ad
 	SIOCGIFGENERIC                    = 0xc020693a
 	SIOCGIFKPI                        = 0xc0206987
 	SIOCGIFMAC                        = 0xc0206982
@@ -1233,6 +1276,7 @@ const (
 	SIOCGIFSTATUS                     = 0xc331693d
 	SIOCGIFVLAN                       = 0xc020697f
 	SIOCGIFWAKEFLAGS                  = 0xc0206988
+	SIOCGIFXMEDIA                     = 0xc02c6948
 	SIOCGLOWAT                        = 0x40047303
 	SIOCGPGRP                         = 0x40047309
 	SIOCIFCREATE                      = 0xc0206978
@@ -1243,6 +1287,7 @@ const (
 	SIOCSDRVSPEC                      = 0x8028697b
 	SIOCSETVLAN                       = 0x8020697e
 	SIOCSHIWAT                        = 0x80047300
+	SIOCSIF6LOWPAN                    = 0x802069c4
 	SIOCSIFADDR                       = 0x8020690c
 	SIOCSIFALTMTU                     = 0x80206945
 	SIOCSIFASYNCMAP                   = 0x8020697d
@@ -1270,6 +1315,7 @@ const (
 	SOCK_RDM                          = 0x4
 	SOCK_SEQPACKET                    = 0x5
 	SOCK_STREAM                       = 0x1
+	SOL_LOCAL                         = 0x0
 	SOL_SOCKET                        = 0xffff
 	SOMAXCONN                         = 0x80
 	SO_ACCEPTCONN                     = 0x2

src/cmd/vendor/golang.org/x/sys/unix/zerrors_darwin_arm64.go

@@ -32,7 +32,7 @@ const (
 	AF_LAT                            = 0xe
 	AF_LINK                           = 0x12
 	AF_LOCAL                          = 0x1
-	AF_MAX                            = 0x28
+	AF_MAX                            = 0x29
 	AF_NATM                           = 0x1f
 	AF_NDRV                           = 0x1b
 	AF_NETBIOS                        = 0x21
@@ -49,6 +49,7 @@ const (
 	AF_UNIX                           = 0x1
 	AF_UNSPEC                         = 0x0
 	AF_UTUN                           = 0x26
+	AF_VSOCK                          = 0x28
 	ALTWERASE                         = 0x200
 	ATTR_BIT_MAP_COUNT                = 0x5
 	ATTR_CMN_ACCESSMASK               = 0x20000
@@ -83,7 +84,7 @@ const (
 	ATTR_CMN_PAROBJID                 = 0x80
 	ATTR_CMN_RETURNED_ATTRS           = 0x80000000
 	ATTR_CMN_SCRIPT                   = 0x100
-	ATTR_CMN_SETMASK                  = 0x41c7ff00
+	ATTR_CMN_SETMASK                  = 0x51c7ff00
 	ATTR_CMN_USERACCESS               = 0x200000
 	ATTR_CMN_UUID                     = 0x800000
 	ATTR_CMN_VALIDMASK                = 0xffffffff
@@ -357,7 +358,7 @@ const (
 	DLT_LINUX_SLL                     = 0x71
 	DLT_LOOP                          = 0x6c
 	DLT_LTALK                         = 0x72
-	DLT_MATCHING_MAX                  = 0xf5
+	DLT_MATCHING_MAX                  = 0x10a
 	DLT_MATCHING_MIN                  = 0x68
 	DLT_MFR                           = 0xb6
 	DLT_MOST                          = 0xd3
@@ -398,6 +399,7 @@ const (
 	DLT_SYMANTEC_FIREWALL             = 0x63
 	DLT_TZSP                          = 0x80
 	DLT_USB                           = 0xba
+	DLT_USB_DARWIN                    = 0x10a
 	DLT_USB_LINUX                     = 0xbd
 	DLT_USB_LINUX_MMAPPED             = 0xdc
 	DLT_USER0                         = 0x93
@@ -442,8 +444,8 @@ const (
 	EVFILT_PROC                       = -0x5
 	EVFILT_READ                       = -0x1
 	EVFILT_SIGNAL                     = -0x6
-	EVFILT_SYSCOUNT                   = 0xf
+	EVFILT_SYSCOUNT                   = 0x11
-	EVFILT_THREADMARKER               = 0xf
+	EVFILT_THREADMARKER               = 0x11
 	EVFILT_TIMER                      = -0x7
 	EVFILT_USER                       = -0xa
 	EVFILT_VM                         = -0xc
@@ -481,9 +483,12 @@ const (
 	FSOPT_NOINMEMUPDATE               = 0x2
 	FSOPT_PACK_INVAL_ATTRS            = 0x8
 	FSOPT_REPORT_FULLSIZE             = 0x4
+	FSOPT_RETURN_REALDEV              = 0x200
 	F_ADDFILESIGS                     = 0x3d
 	F_ADDFILESIGS_FOR_DYLD_SIM        = 0x53
+	F_ADDFILESIGS_INFO                = 0x67
 	F_ADDFILESIGS_RETURN              = 0x61
+	F_ADDFILESUPPL                    = 0x68
 	F_ADDSIGS                         = 0x3b
 	F_ALLOCATEALL                     = 0x4
 	F_ALLOCATECONTIG                  = 0x2
@@ -505,8 +510,10 @@ const (
 	F_GETOWN                          = 0x5
 	F_GETPATH                         = 0x32
 	F_GETPATH_MTMINFO                 = 0x47
+	F_GETPATH_NOFIRMLINK              = 0x66
 	F_GETPROTECTIONCLASS              = 0x3f
 	F_GETPROTECTIONLEVEL              = 0x4d
+	F_GETSIGSINFO                     = 0x69
 	F_GLOBAL_NOCACHE                  = 0x37
 	F_LOG2PHYS                        = 0x31
 	F_LOG2PHYS_EXT                    = 0x41
@@ -531,6 +538,7 @@ const (
 	F_SETPROTECTIONCLASS              = 0x40
 	F_SETSIZE                         = 0x2b
 	F_SINGLE_WRITER                   = 0x4c
+	F_SPECULATIVE_READ                = 0x65
 	F_THAW_FS                         = 0x36
 	F_TRANSCODEKEY                    = 0x4b
 	F_TRIM_ACTIVE_FILE                = 0x64
@@ -562,6 +570,7 @@ const (
 	IFF_UP                            = 0x1
 	IFNAMSIZ                          = 0x10
 	IFT_1822                          = 0x2
+	IFT_6LOWPAN                       = 0x40
 	IFT_AAL5                          = 0x31
 	IFT_ARCNET                        = 0x23
 	IFT_ARCNETPLUS                    = 0x24
@@ -766,6 +775,9 @@ const (
 	IPV6_2292PKTINFO                  = 0x13
 	IPV6_2292PKTOPTIONS               = 0x19
 	IPV6_2292RTHDR                    = 0x18
+	IPV6_ADDR_MC_FLAGS_PREFIX         = 0x20
+	IPV6_ADDR_MC_FLAGS_TRANSIENT      = 0x10
+	IPV6_ADDR_MC_FLAGS_UNICAST_BASED  = 0x30
 	IPV6_BINDV6ONLY                   = 0x1b
 	IPV6_BOUND_IF                     = 0x7d
 	IPV6_CHECKSUM                     = 0x1a
@@ -775,7 +787,7 @@ const (
 	IPV6_FAITH                        = 0x1d
 	IPV6_FLOWINFO_MASK                = 0xffffff0f
 	IPV6_FLOWLABEL_MASK               = 0xffff0f00
-	IPV6_FLOW_ECN_MASK                = 0x300
+	IPV6_FLOW_ECN_MASK                = 0x3000
 	IPV6_FRAGTTL                      = 0x3c
 	IPV6_FW_ADD                       = 0x1e
 	IPV6_FW_DEL                       = 0x1f
@@ -818,6 +830,7 @@ const (
 	IP_DEFAULT_MULTICAST_LOOP         = 0x1
 	IP_DEFAULT_MULTICAST_TTL          = 0x1
 	IP_DF                             = 0x4000
+	IP_DONTFRAG                       = 0x1c
 	IP_DROP_MEMBERSHIP                = 0xd
 	IP_DROP_SOURCE_MEMBERSHIP         = 0x47
 	IP_DUMMYNET_CONFIGURE             = 0x3c
@@ -889,6 +902,12 @@ const (
 	KERN_OSRELEASE                    = 0x2
 	KERN_OSTYPE                       = 0x1
 	KERN_VERSION                      = 0x4
+	LOCAL_PEERCRED                    = 0x1
+	LOCAL_PEEREPID                    = 0x3
+	LOCAL_PEEREUUID                   = 0x5
+	LOCAL_PEERPID                     = 0x2
+	LOCAL_PEERTOKEN                   = 0x6
+	LOCAL_PEERUUID                    = 0x4
 	LOCK_EX                           = 0x2
 	LOCK_NB                           = 0x4
 	LOCK_SH                           = 0x1
@@ -904,6 +923,7 @@ const (
 	MADV_SEQUENTIAL                   = 0x2
 	MADV_WILLNEED                     = 0x3
 	MADV_ZERO_WIRED_PAGES             = 0x6
+	MAP_32BIT                         = 0x8000
 	MAP_ANON                          = 0x1000
 	MAP_ANONYMOUS                     = 0x1000
 	MAP_COPY                          = 0x2
@@ -920,6 +940,17 @@ const (
 	MAP_RESILIENT_CODESIGN            = 0x2000
 	MAP_RESILIENT_MEDIA               = 0x4000
 	MAP_SHARED                        = 0x1
+	MAP_TRANSLATED_ALLOW_EXECUTE      = 0x20000
+	MAP_UNIX03                        = 0x40000
+	MCAST_BLOCK_SOURCE                = 0x54
+	MCAST_EXCLUDE                     = 0x2
+	MCAST_INCLUDE                     = 0x1
+	MCAST_JOIN_GROUP                  = 0x50
+	MCAST_JOIN_SOURCE_GROUP           = 0x52
+	MCAST_LEAVE_GROUP                 = 0x51
+	MCAST_LEAVE_SOURCE_GROUP          = 0x53
+	MCAST_UNBLOCK_SOURCE              = 0x55
+	MCAST_UNDEFINED                   = 0x0
 	MCL_CURRENT                       = 0x1
 	MCL_FUTURE                        = 0x2
 	MNT_ASYNC                         = 0x40
@@ -931,6 +962,7 @@ const (
 	MNT_DOVOLFS                       = 0x8000
 	MNT_DWAIT                         = 0x4
 	MNT_EXPORTED                      = 0x100
+	MNT_EXT_ROOT_DATA_VOL             = 0x1
 	MNT_FORCE                         = 0x80000
 	MNT_IGNORE_OWNERSHIP              = 0x200000
 	MNT_JOURNALED                     = 0x800000
@@ -947,12 +979,15 @@ const (
 	MNT_QUOTA                         = 0x2000
 	MNT_RDONLY                        = 0x1
 	MNT_RELOAD                        = 0x40000
+	MNT_REMOVABLE                     = 0x200
 	MNT_ROOTFS                        = 0x4000
+	MNT_SNAPSHOT                      = 0x40000000
+	MNT_STRICTATIME                   = 0x80000000
 	MNT_SYNCHRONOUS                   = 0x2
 	MNT_UNION                         = 0x20
 	MNT_UNKNOWNPERMISSIONS            = 0x200000
 	MNT_UPDATE                        = 0x10000
-	MNT_VISFLAGMASK                   = 0x17f0f5ff
+	MNT_VISFLAGMASK                   = 0xd7f0f7ff
 	MNT_WAIT                          = 0x1
 	MSG_CTRUNC                        = 0x20
 	MSG_DONTROUTE                     = 0x4
@@ -963,6 +998,7 @@ const (
 	MSG_HAVEMORE                      = 0x2000
 	MSG_HOLD                          = 0x800
 	MSG_NEEDSA                        = 0x10000
+	MSG_NOSIGNAL                      = 0x80000
 	MSG_OOB                           = 0x1
 	MSG_PEEK                          = 0x2
 	MSG_RCVMORE                       = 0x4000
@@ -979,9 +1015,10 @@ const (
 	NET_RT_DUMP                       = 0x1
 	NET_RT_DUMP2                      = 0x7
 	NET_RT_FLAGS                      = 0x2
+	NET_RT_FLAGS_PRIV                 = 0xa
 	NET_RT_IFLIST                     = 0x3
 	NET_RT_IFLIST2                    = 0x6
-	NET_RT_MAXID                      = 0xa
+	NET_RT_MAXID                      = 0xb
 	NET_RT_STAT                       = 0x4
 	NET_RT_TRASH                      = 0x5
 	NFDBITS                           = 0x20
@@ -1019,6 +1056,7 @@ const (
 	NOTE_LEEWAY                       = 0x10
 	NOTE_LINK                         = 0x10
 	NOTE_LOWAT                        = 0x1
+	NOTE_MACHTIME                     = 0x100
 	NOTE_MACH_CONTINUOUS_TIME         = 0x80
 	NOTE_NONE                         = 0x80
 	NOTE_NSECONDS                     = 0x4
@@ -1065,6 +1103,7 @@ const (
 	O_NDELAY                          = 0x4
 	O_NOCTTY                          = 0x20000
 	O_NOFOLLOW                        = 0x100
+	O_NOFOLLOW_ANY                    = 0x20000000
 	O_NONBLOCK                        = 0x4
 	O_POPUP                           = 0x80000000
 	O_RDONLY                          = 0x0
@@ -1136,6 +1175,7 @@ const (
 	RTF_BROADCAST                     = 0x400000
 	RTF_CLONING                       = 0x100
 	RTF_CONDEMNED                     = 0x2000000
+	RTF_DEAD                          = 0x20000000
 	RTF_DELCLONE                      = 0x80
 	RTF_DONE                          = 0x40
 	RTF_DYNAMIC                       = 0x10
@@ -1143,6 +1183,7 @@ const (
 	RTF_HOST                          = 0x4
 	RTF_IFREF                         = 0x4000000
 	RTF_IFSCOPE                       = 0x1000000
+	RTF_LLDATA                        = 0x400
 	RTF_LLINFO                        = 0x400
 	RTF_LOCAL                         = 0x200000
 	RTF_MODIFIED                      = 0x20
@@ -1210,6 +1251,7 @@ const (
 	SIOCGDRVSPEC                      = 0xc028697b
 	SIOCGETVLAN                       = 0xc020697f
 	SIOCGHIWAT                        = 0x40047301
+	SIOCGIF6LOWPAN                    = 0xc02069c5
 	SIOCGIFADDR                       = 0xc0206921
 	SIOCGIFALTMTU                     = 0xc0206948
 	SIOCGIFASYNCMAP                   = 0xc020697c
@@ -1220,6 +1262,7 @@ const (
 	SIOCGIFDEVMTU                     = 0xc0206944
 	SIOCGIFDSTADDR                    = 0xc0206922
 	SIOCGIFFLAGS                      = 0xc0206911
+	SIOCGIFFUNCTIONALTYPE             = 0xc02069ad
 	SIOCGIFGENERIC                    = 0xc020693a
 	SIOCGIFKPI                        = 0xc0206987
 	SIOCGIFMAC                        = 0xc0206982
@@ -1233,6 +1276,7 @@ const (
 	SIOCGIFSTATUS                     = 0xc331693d
 	SIOCGIFVLAN                       = 0xc020697f
 	SIOCGIFWAKEFLAGS                  = 0xc0206988
+	SIOCGIFXMEDIA                     = 0xc02c6948
 	SIOCGLOWAT                        = 0x40047303
 	SIOCGPGRP                         = 0x40047309
 	SIOCIFCREATE                      = 0xc0206978
@@ -1243,6 +1287,7 @@ const (
 	SIOCSDRVSPEC                      = 0x8028697b
 	SIOCSETVLAN                       = 0x8020697e
 	SIOCSHIWAT                        = 0x80047300
+	SIOCSIF6LOWPAN                    = 0x802069c4
 	SIOCSIFADDR                       = 0x8020690c
 	SIOCSIFALTMTU                     = 0x80206945
 	SIOCSIFASYNCMAP                   = 0x8020697d
@@ -1270,6 +1315,7 @@ const (
 	SOCK_RDM                          = 0x4
 	SOCK_SEQPACKET                    = 0x5
 	SOCK_STREAM                       = 0x1
+	SOL_LOCAL                         = 0x0
 	SOL_SOCKET                        = 0xffff
 	SOMAXCONN                         = 0x80
 	SO_ACCEPTCONN                     = 0x2

src/cmd/vendor/golang.org/x/sys/unix/zerrors_linux.go

@@ -65,6 +65,7 @@ const (
 	ALG_OP_ENCRYPT                              = 0x1
 	ALG_SET_AEAD_ASSOCLEN                       = 0x4
 	ALG_SET_AEAD_AUTHSIZE                       = 0x5
+	ALG_SET_DRBG_ENTROPY                        = 0x6
 	ALG_SET_IV                                  = 0x2
 	ALG_SET_KEY                                 = 0x1
 	ALG_SET_OP                                  = 0x3
@@ -179,8 +180,10 @@ const (
 	BPF_F_ANY_ALIGNMENT                         = 0x2
 	BPF_F_QUERY_EFFECTIVE                       = 0x1
 	BPF_F_REPLACE                               = 0x4
+	BPF_F_SLEEPABLE                             = 0x10
 	BPF_F_STRICT_ALIGNMENT                      = 0x1
 	BPF_F_TEST_RND_HI32                         = 0x4
+	BPF_F_TEST_RUN_ON_CPU                       = 0x1
 	BPF_F_TEST_STATE_FREQ                       = 0x8
 	BPF_H                                       = 0x8
 	BPF_IMM                                     = 0x0
@@ -219,6 +222,7 @@ const (
 	BPF_NET_OFF                                 = -0x100000
 	BPF_OBJ_NAME_LEN                            = 0x10
 	BPF_OR                                      = 0x40
+	BPF_PSEUDO_BTF_ID                           = 0x3
 	BPF_PSEUDO_CALL                             = 0x1
 	BPF_PSEUDO_MAP_FD                           = 0x1
 	BPF_PSEUDO_MAP_VALUE                        = 0x2
@@ -309,6 +313,7 @@ const (
 	CAN_J1939                                   = 0x7
 	CAN_MAX_DLC                                 = 0x8
 	CAN_MAX_DLEN                                = 0x8
+	CAN_MAX_RAW_DLC                             = 0xf
 	CAN_MCNET                                   = 0x5
 	CAN_MTU                                     = 0x10
 	CAN_NPROTO                                  = 0x8
@@ -429,10 +434,13 @@ const (
 	DEBUGFS_MAGIC                               = 0x64626720
 	DEVLINK_CMD_ESWITCH_MODE_GET                = 0x1d
 	DEVLINK_CMD_ESWITCH_MODE_SET                = 0x1e
+	DEVLINK_FLASH_OVERWRITE_IDENTIFIERS         = 0x2
+	DEVLINK_FLASH_OVERWRITE_SETTINGS            = 0x1
 	DEVLINK_GENL_MCGRP_CONFIG_NAME              = "config"
 	DEVLINK_GENL_NAME                           = "devlink"
 	DEVLINK_GENL_VERSION                        = 0x1
 	DEVLINK_SB_THRESHOLD_TO_ALPHA_MAX           = 0x14
+	DEVLINK_SUPPORTED_FLASH_OVERWRITE_SECTIONS  = 0x3
 	DEVMEM_MAGIC                                = 0x454d444d
 	DEVPTS_SUPER_MAGIC                          = 0x1cd1
 	DMA_BUF_MAGIC                               = 0x444d4142
@@ -477,9 +485,9 @@ const (
 	DM_UUID_FLAG                                = 0x4000
 	DM_UUID_LEN                                 = 0x81
 	DM_VERSION                                  = 0xc138fd00
-	DM_VERSION_EXTRA                            = "-ioctl (2020-02-27)"
+	DM_VERSION_EXTRA                            = "-ioctl (2020-10-01)"
 	DM_VERSION_MAJOR                            = 0x4
-	DM_VERSION_MINOR                            = 0x2a
+	DM_VERSION_MINOR                            = 0x2b
 	DM_VERSION_PATCHLEVEL                       = 0x0
 	DT_BLK                                      = 0x6
 	DT_CHR                                      = 0x2
@@ -520,6 +528,119 @@ const (
 	EPOLL_CTL_DEL                               = 0x2
 	EPOLL_CTL_MOD                               = 0x3
 	EROFS_SUPER_MAGIC_V1                        = 0xe0f5e1e2
+	ESP_V4_FLOW                                 = 0xa
+	ESP_V6_FLOW                                 = 0xc
+	ETHER_FLOW                                  = 0x12
+	ETHTOOL_BUSINFO_LEN                         = 0x20
+	ETHTOOL_EROMVERS_LEN                        = 0x20
+	ETHTOOL_FEC_AUTO                            = 0x2
+	ETHTOOL_FEC_BASER                           = 0x10
+	ETHTOOL_FEC_LLRS                            = 0x20
+	ETHTOOL_FEC_NONE                            = 0x1
+	ETHTOOL_FEC_OFF                             = 0x4
+	ETHTOOL_FEC_RS                              = 0x8
+	ETHTOOL_FLAG_ALL                            = 0x7
+	ETHTOOL_FLAG_COMPACT_BITSETS                = 0x1
+	ETHTOOL_FLAG_OMIT_REPLY                     = 0x2
+	ETHTOOL_FLAG_STATS                          = 0x4
+	ETHTOOL_FLASHDEV                            = 0x33
+	ETHTOOL_FLASH_MAX_FILENAME                  = 0x80
+	ETHTOOL_FWVERS_LEN                          = 0x20
+	ETHTOOL_F_COMPAT                            = 0x4
+	ETHTOOL_F_UNSUPPORTED                       = 0x1
+	ETHTOOL_F_WISH                              = 0x2
+	ETHTOOL_GCHANNELS                           = 0x3c
+	ETHTOOL_GCOALESCE                           = 0xe
+	ETHTOOL_GDRVINFO                            = 0x3
+	ETHTOOL_GEEE                                = 0x44
+	ETHTOOL_GEEPROM                             = 0xb
+	ETHTOOL_GENL_NAME                           = "ethtool"
+	ETHTOOL_GENL_VERSION                        = 0x1
+	ETHTOOL_GET_DUMP_DATA                       = 0x40
+	ETHTOOL_GET_DUMP_FLAG                       = 0x3f
+	ETHTOOL_GET_TS_INFO                         = 0x41
+	ETHTOOL_GFEATURES                           = 0x3a
+	ETHTOOL_GFECPARAM                           = 0x50
+	ETHTOOL_GFLAGS                              = 0x25
+	ETHTOOL_GGRO                                = 0x2b
+	ETHTOOL_GGSO                                = 0x23
+	ETHTOOL_GLINK                               = 0xa
+	ETHTOOL_GLINKSETTINGS                       = 0x4c
+	ETHTOOL_GMODULEEEPROM                       = 0x43
+	ETHTOOL_GMODULEINFO                         = 0x42
+	ETHTOOL_GMSGLVL                             = 0x7
+	ETHTOOL_GPAUSEPARAM                         = 0x12
+	ETHTOOL_GPERMADDR                           = 0x20
+	ETHTOOL_GPFLAGS                             = 0x27
+	ETHTOOL_GPHYSTATS                           = 0x4a
+	ETHTOOL_GREGS                               = 0x4
+	ETHTOOL_GRINGPARAM                          = 0x10
+	ETHTOOL_GRSSH                               = 0x46
+	ETHTOOL_GRXCLSRLALL                         = 0x30
+	ETHTOOL_GRXCLSRLCNT                         = 0x2e
+	ETHTOOL_GRXCLSRULE                          = 0x2f
+	ETHTOOL_GRXCSUM                             = 0x14
+	ETHTOOL_GRXFH                               = 0x29
+	ETHTOOL_GRXFHINDIR                          = 0x38
+	ETHTOOL_GRXNTUPLE                           = 0x36
+	ETHTOOL_GRXRINGS                            = 0x2d
+	ETHTOOL_GSET                                = 0x1
+	ETHTOOL_GSG                                 = 0x18
+	ETHTOOL_GSSET_INFO                          = 0x37
+	ETHTOOL_GSTATS                              = 0x1d
+	ETHTOOL_GSTRINGS                            = 0x1b
+	ETHTOOL_GTSO                                = 0x1e
+	ETHTOOL_GTUNABLE                            = 0x48
+	ETHTOOL_GTXCSUM                             = 0x16
+	ETHTOOL_GUFO                                = 0x21
+	ETHTOOL_GWOL                                = 0x5
+	ETHTOOL_MCGRP_MONITOR_NAME                  = "monitor"
+	ETHTOOL_NWAY_RST                            = 0x9
+	ETHTOOL_PERQUEUE                            = 0x4b
+	ETHTOOL_PHYS_ID                             = 0x1c
+	ETHTOOL_PHY_EDPD_DFLT_TX_MSECS              = 0xffff
+	ETHTOOL_PHY_EDPD_DISABLE                    = 0x0
+	ETHTOOL_PHY_EDPD_NO_TX                      = 0xfffe
+	ETHTOOL_PHY_FAST_LINK_DOWN_OFF              = 0xff
+	ETHTOOL_PHY_FAST_LINK_DOWN_ON               = 0x0
+	ETHTOOL_PHY_GTUNABLE                        = 0x4e
+	ETHTOOL_PHY_STUNABLE                        = 0x4f
+	ETHTOOL_RESET                               = 0x34
+	ETHTOOL_RXNTUPLE_ACTION_CLEAR               = -0x2
+	ETHTOOL_RXNTUPLE_ACTION_DROP                = -0x1
+	ETHTOOL_RX_FLOW_SPEC_RING                   = 0xffffffff
+	ETHTOOL_RX_FLOW_SPEC_RING_VF                = 0xff00000000
+	ETHTOOL_RX_FLOW_SPEC_RING_VF_OFF            = 0x20
+	ETHTOOL_SCHANNELS                           = 0x3d
+	ETHTOOL_SCOALESCE                           = 0xf
+	ETHTOOL_SEEE                                = 0x45
+	ETHTOOL_SEEPROM                             = 0xc
+	ETHTOOL_SET_DUMP                            = 0x3e
+	ETHTOOL_SFEATURES                           = 0x3b
+	ETHTOOL_SFECPARAM                           = 0x51
+	ETHTOOL_SFLAGS                              = 0x26
+	ETHTOOL_SGRO                                = 0x2c
+	ETHTOOL_SGSO                                = 0x24
+	ETHTOOL_SLINKSETTINGS                       = 0x4d
+	ETHTOOL_SMSGLVL                             = 0x8
+	ETHTOOL_SPAUSEPARAM                         = 0x13
+	ETHTOOL_SPFLAGS                             = 0x28
+	ETHTOOL_SRINGPARAM                          = 0x11
+	ETHTOOL_SRSSH                               = 0x47
+	ETHTOOL_SRXCLSRLDEL                         = 0x31
+	ETHTOOL_SRXCLSRLINS                         = 0x32
+	ETHTOOL_SRXCSUM                             = 0x15
+	ETHTOOL_SRXFH                               = 0x2a
+	ETHTOOL_SRXFHINDIR                          = 0x39
+	ETHTOOL_SRXNTUPLE                           = 0x35
+	ETHTOOL_SSET                                = 0x2
+	ETHTOOL_SSG                                 = 0x19
+	ETHTOOL_STSO                                = 0x1f
+	ETHTOOL_STUNABLE                            = 0x49
+	ETHTOOL_STXCSUM                             = 0x17
+	ETHTOOL_SUFO                                = 0x22
+	ETHTOOL_SWOL                                = 0x6
+	ETHTOOL_TEST                                = 0x1a
 	ETH_P_1588                                  = 0x88f7
 	ETH_P_8021AD                                = 0x88a8
 	ETH_P_8021AH                                = 0x88e7
@@ -544,6 +665,7 @@ const (
 	ETH_P_CAIF                                  = 0xf7
 	ETH_P_CAN                                   = 0xc
 	ETH_P_CANFD                                 = 0xd
+	ETH_P_CFM                                   = 0x8902
 	ETH_P_CONTROL                               = 0x16
 	ETH_P_CUST                                  = 0x6006
 	ETH_P_DDCMP                                 = 0x6
@@ -714,7 +836,6 @@ const (
 	FSCRYPT_POLICY_FLAGS_PAD_4                  = 0x0
 	FSCRYPT_POLICY_FLAGS_PAD_8                  = 0x1
 	FSCRYPT_POLICY_FLAGS_PAD_MASK               = 0x3
-	FSCRYPT_POLICY_FLAGS_VALID                  = 0x1f
 	FSCRYPT_POLICY_FLAG_DIRECT_KEY              = 0x4
 	FSCRYPT_POLICY_FLAG_IV_INO_LBLK_32          = 0x10
 	FSCRYPT_POLICY_FLAG_IV_INO_LBLK_64          = 0x8
@@ -745,7 +866,7 @@ const (
 	FS_POLICY_FLAGS_PAD_4                       = 0x0
 	FS_POLICY_FLAGS_PAD_8                       = 0x1
 	FS_POLICY_FLAGS_PAD_MASK                    = 0x3
-	FS_POLICY_FLAGS_VALID                       = 0x1f
+	FS_POLICY_FLAGS_VALID                       = 0x7
 	FS_VERITY_FL                                = 0x100000
 	FS_VERITY_HASH_ALG_SHA256                   = 0x1
 	FS_VERITY_HASH_ALG_SHA512                   = 0x2
@@ -989,6 +1110,7 @@ const (
 	IPV6_DONTFRAG                               = 0x3e
 	IPV6_DROP_MEMBERSHIP                        = 0x15
 	IPV6_DSTOPTS                                = 0x3b
+	IPV6_FLOW                                   = 0x11
 	IPV6_FREEBIND                               = 0x4e
 	IPV6_HDRINCL                                = 0x24
 	IPV6_HOPLIMIT                               = 0x34
@@ -1017,6 +1139,7 @@ const (
 	IPV6_PMTUDISC_WANT                          = 0x1
 	IPV6_RECVDSTOPTS                            = 0x3a
 	IPV6_RECVERR                                = 0x19
+	IPV6_RECVERR_RFC4884                        = 0x1f
 	IPV6_RECVFRAGSIZE                           = 0x4d
 	IPV6_RECVHOPLIMIT                           = 0x33
 	IPV6_RECVHOPOPTS                            = 0x35
@@ -1038,6 +1161,7 @@ const (
 	IPV6_TRANSPARENT                            = 0x4b
 	IPV6_UNICAST_HOPS                           = 0x10
 	IPV6_UNICAST_IF                             = 0x4c
+	IPV6_USER_FLOW                              = 0xe
 	IPV6_V6ONLY                                 = 0x1a
 	IPV6_XFRM_POLICY                            = 0x23
 	IP_ADD_MEMBERSHIP                           = 0x23
@@ -1080,6 +1204,7 @@ const (
 	IP_PMTUDISC_PROBE                           = 0x3
 	IP_PMTUDISC_WANT                            = 0x1
 	IP_RECVERR                                  = 0xb
+	IP_RECVERR_RFC4884                          = 0x1a
 	IP_RECVFRAGSIZE                             = 0x19
 	IP_RECVOPTS                                 = 0x6
 	IP_RECVORIGDSTADDR                          = 0x14
@@ -1094,6 +1219,7 @@ const (
 	IP_TTL                                      = 0x2
 	IP_UNBLOCK_SOURCE                           = 0x25
 	IP_UNICAST_IF                               = 0x32
+	IP_USER_FLOW                                = 0xd
 	IP_XFRM_POLICY                              = 0x11
 	ISOFS_SUPER_MAGIC                           = 0x9660
 	ISTRIP                                      = 0x20
@@ -1331,6 +1457,7 @@ const (
 	MS_NOREMOTELOCK                             = 0x8000000
 	MS_NOSEC                                    = 0x10000000
 	MS_NOSUID                                   = 0x2
+	MS_NOSYMFOLLOW                              = 0x100
 	MS_NOUSER                                   = -0x80000000
 	MS_POSIXACL                                 = 0x10000
 	MS_PRIVATE                                  = 0x40000
@@ -1572,7 +1699,7 @@ const (
 	PERF_MEM_REMOTE_REMOTE                      = 0x1
 	PERF_MEM_REMOTE_SHIFT                       = 0x25
 	PERF_MEM_SNOOPX_FWD                         = 0x1
-	PERF_MEM_SNOOPX_SHIFT                       = 0x25
+	PERF_MEM_SNOOPX_SHIFT                       = 0x26
 	PERF_MEM_SNOOP_HIT                          = 0x4
 	PERF_MEM_SNOOP_HITM                         = 0x10
 	PERF_MEM_SNOOP_MISS                         = 0x8
@@ -1672,6 +1799,13 @@ const (
 	PR_MCE_KILL_SET                             = 0x1
 	PR_MPX_DISABLE_MANAGEMENT                   = 0x2c
 	PR_MPX_ENABLE_MANAGEMENT                    = 0x2b
+	PR_MTE_TAG_MASK                             = 0x7fff8
+	PR_MTE_TAG_SHIFT                            = 0x3
+	PR_MTE_TCF_ASYNC                            = 0x4
+	PR_MTE_TCF_MASK                             = 0x6
+	PR_MTE_TCF_NONE                             = 0x0
+	PR_MTE_TCF_SHIFT                            = 0x1
+	PR_MTE_TCF_SYNC                             = 0x2
 	PR_PAC_APDAKEY                              = 0x4
 	PR_PAC_APDBKEY                              = 0x8
 	PR_PAC_APGAKEY                              = 0x10
@@ -1709,6 +1843,7 @@ const (
 	PR_SET_SECCOMP                              = 0x16
 	PR_SET_SECUREBITS                           = 0x1c
 	PR_SET_SPECULATION_CTRL                     = 0x35
+	PR_SET_SYSCALL_USER_DISPATCH                = 0x3b
 	PR_SET_TAGGED_ADDR_CTRL                     = 0x37
 	PR_SET_THP_DISABLE                          = 0x29
 	PR_SET_TIMERSLACK                           = 0x1d
@@ -1728,6 +1863,8 @@ const (
 	PR_SVE_SET_VL_ONEXEC                        = 0x40000
 	PR_SVE_VL_INHERIT                           = 0x20000
 	PR_SVE_VL_LEN_MASK                          = 0xffff
+	PR_SYS_DISPATCH_OFF                         = 0x0
+	PR_SYS_DISPATCH_ON                          = 0x1
 	PR_TAGGED_ADDR_ENABLE                       = 0x1
 	PR_TASK_PERF_EVENTS_DISABLE                 = 0x1f
 	PR_TASK_PERF_EVENTS_ENABLE                  = 0x20
@@ -1973,12 +2110,13 @@ const (
 	RTM_SETLINK                                 = 0x13
 	RTM_SETNEIGHTBL                             = 0x43
 	RTNH_ALIGNTO                                = 0x4
-	RTNH_COMPARE_MASK                           = 0x19
+	RTNH_COMPARE_MASK                           = 0x59
 	RTNH_F_DEAD                                 = 0x1
 	RTNH_F_LINKDOWN                             = 0x10
 	RTNH_F_OFFLOAD                              = 0x8
 	RTNH_F_ONLINK                               = 0x4
 	RTNH_F_PERVASIVE                            = 0x2
+	RTNH_F_TRAP                                 = 0x40
 	RTNH_F_UNRESOLVED                           = 0x20
 	RTN_MAX                                     = 0xb
 	RTPROT_BABEL                                = 0x2a
@@ -2206,7 +2344,7 @@ const (
 	STATX_ATTR_APPEND                           = 0x20
 	STATX_ATTR_AUTOMOUNT                        = 0x1000
 	STATX_ATTR_COMPRESSED                       = 0x4
-	STATX_ATTR_DAX                              = 0x2000
+	STATX_ATTR_DAX                              = 0x200000
 	STATX_ATTR_ENCRYPTED                        = 0x800
 	STATX_ATTR_IMMUTABLE                        = 0x10
 	STATX_ATTR_MOUNT_ROOT                       = 0x2000
@@ -2325,6 +2463,8 @@ const (
 	TCP_TX_DELAY                                = 0x25
 	TCP_ULP                                     = 0x1f
 	TCP_USER_TIMEOUT                            = 0x12
+	TCP_V4_FLOW                                 = 0x1
+	TCP_V6_FLOW                                 = 0x5
 	TCP_WINDOW_CLAMP                            = 0xa
 	TCP_ZEROCOPY_RECEIVE                        = 0x23
 	TFD_TIMER_ABSTIME                           = 0x1
@@ -2390,6 +2530,7 @@ const (
 	TIPC_NODE_STATE                             = 0x0
 	TIPC_OK                                     = 0x0
 	TIPC_PUBLISHED                              = 0x1
+	TIPC_REKEYING_NOW                           = 0xffffffff
 	TIPC_RESERVED_TYPES                         = 0x40
 	TIPC_RETDATA                                = 0x2
 	TIPC_SERVICE_ADDR                           = 0x2
@@ -2446,10 +2587,12 @@ const (
 	VMADDR_CID_HOST                             = 0x2
 	VMADDR_CID_HYPERVISOR                       = 0x0
 	VMADDR_CID_LOCAL                            = 0x1
+	VMADDR_FLAG_TO_HOST                         = 0x1
 	VMADDR_PORT_ANY                             = 0xffffffff
 	VM_SOCKETS_INVALID_VERSION                  = 0xffffffff
 	VQUIT                                       = 0x1
 	VT0                                         = 0x0
+	WAKE_MAGIC                                  = 0x20
 	WALL                                        = 0x40000000
 	WCLONE                                      = 0x80000000
 	WCONTINUED                                  = 0x8

src/cmd/vendor/golang.org/x/sys/unix/zerrors_linux_386.go

@@ -4,7 +4,7 @@
 // +build 386,linux
 
 // Code generated by cmd/cgo -godefs; DO NOT EDIT.
-// cgo -godefs -- -Wall -Werror -static -I/tmp/include -m32 _const.go
+// cgo -godefs -- -Wall -Werror -static -I/tmp/include -m32 /build/_const.go
 
 package unix
 
@@ -165,6 +165,7 @@ const (
 	PERF_EVENT_IOC_SET_OUTPUT        = 0x2405
 	PPPIOCATTACH                     = 0x4004743d
 	PPPIOCATTCHAN                    = 0x40047438
+	PPPIOCBRIDGECHAN                 = 0x40047435
 	PPPIOCCONNECT                    = 0x4004743a
 	PPPIOCDETACH                     = 0x4004743c
 	PPPIOCDISCONN                    = 0x7439
@@ -192,6 +193,7 @@ const (
 	PPPIOCSPASS                      = 0x40087447
 	PPPIOCSRASYNCMAP                 = 0x40047454
 	PPPIOCSXASYNCMAP                 = 0x4020744f
+	PPPIOCUNBRIDGECHAN               = 0x7434
 	PPPIOCXFERUNIT                   = 0x744e
 	PR_SET_PTRACER_ANY               = 0xffffffff
 	PTRACE_GETFPREGS                 = 0xe
@@ -268,6 +270,7 @@ const (
 	SO_BROADCAST                     = 0x6
 	SO_BSDCOMPAT                     = 0xe
 	SO_BUSY_POLL                     = 0x2e
+	SO_BUSY_POLL_BUDGET              = 0x46
 	SO_CNX_ADVICE                    = 0x35
 	SO_COOKIE                        = 0x39
 	SO_DETACH_REUSEPORT_BPF          = 0x44
@@ -290,6 +293,7 @@ const (
 	SO_PEERCRED                      = 0x11
 	SO_PEERGROUPS                    = 0x3b
 	SO_PEERSEC                       = 0x1f
+	SO_PREFER_BUSY_POLL              = 0x45
 	SO_PROTOCOL                      = 0x26
 	SO_RCVBUF                        = 0x8
 	SO_RCVBUFFORCE                   = 0x21

src/cmd/vendor/golang.org/x/sys/unix/zerrors_linux_amd64.go

@@ -4,7 +4,7 @@
 // +build amd64,linux
 
 // Code generated by cmd/cgo -godefs; DO NOT EDIT.
-// cgo -godefs -- -Wall -Werror -static -I/tmp/include -m64 _const.go
+// cgo -godefs -- -Wall -Werror -static -I/tmp/include -m64 /build/_const.go
 
 package unix
 
@@ -165,6 +165,7 @@ const (
 	PERF_EVENT_IOC_SET_OUTPUT        = 0x2405
 	PPPIOCATTACH                     = 0x4004743d
 	PPPIOCATTCHAN                    = 0x40047438
+	PPPIOCBRIDGECHAN                 = 0x40047435
 	PPPIOCCONNECT                    = 0x4004743a
 	PPPIOCDETACH                     = 0x4004743c
 	PPPIOCDISCONN                    = 0x7439
@@ -192,6 +193,7 @@ const (
 	PPPIOCSPASS                      = 0x40107447
 	PPPIOCSRASYNCMAP                 = 0x40047454
 	PPPIOCSXASYNCMAP                 = 0x4020744f
+	PPPIOCUNBRIDGECHAN               = 0x7434
 	PPPIOCXFERUNIT                   = 0x744e
 	PR_SET_PTRACER_ANY               = 0xffffffffffffffff
 	PTRACE_ARCH_PRCTL                = 0x1e
@@ -269,6 +271,7 @@ const (
 	SO_BROADCAST                     = 0x6
 	SO_BSDCOMPAT                     = 0xe
 	SO_BUSY_POLL                     = 0x2e
+	SO_BUSY_POLL_BUDGET              = 0x46
 	SO_CNX_ADVICE                    = 0x35
 	SO_COOKIE                        = 0x39
 	SO_DETACH_REUSEPORT_BPF          = 0x44
@@ -291,6 +294,7 @@ const (
 	SO_PEERCRED                      = 0x11
 	SO_PEERGROUPS                    = 0x3b
 	SO_PEERSEC                       = 0x1f
+	SO_PREFER_BUSY_POLL              = 0x45
 	SO_PROTOCOL                      = 0x26
 	SO_RCVBUF                        = 0x8
 	SO_RCVBUFFORCE                   = 0x21

src/cmd/vendor/golang.org/x/sys/unix/zerrors_linux_arm.go

@@ -4,7 +4,7 @@
 // +build arm,linux
 
 // Code generated by cmd/cgo -godefs; DO NOT EDIT.
-// cgo -godefs -- -Wall -Werror -static -I/tmp/include _const.go
+// cgo -godefs -- -Wall -Werror -static -I/tmp/include /build/_const.go
 
 package unix
 
@@ -163,6 +163,7 @@ const (
 	PERF_EVENT_IOC_SET_OUTPUT        = 0x2405
 	PPPIOCATTACH                     = 0x4004743d
 	PPPIOCATTCHAN                    = 0x40047438
+	PPPIOCBRIDGECHAN                 = 0x40047435
 	PPPIOCCONNECT                    = 0x4004743a
 	PPPIOCDETACH                     = 0x4004743c
 	PPPIOCDISCONN                    = 0x7439
@@ -190,6 +191,7 @@ const (
 	PPPIOCSPASS                      = 0x40087447
 	PPPIOCSRASYNCMAP                 = 0x40047454
 	PPPIOCSXASYNCMAP                 = 0x4020744f
+	PPPIOCUNBRIDGECHAN               = 0x7434
 	PPPIOCXFERUNIT                   = 0x744e
 	PR_SET_PTRACER_ANY               = 0xffffffff
 	PTRACE_GETCRUNCHREGS             = 0x19
@@ -275,6 +277,7 @@ const (
 	SO_BROADCAST                     = 0x6
 	SO_BSDCOMPAT                     = 0xe
 	SO_BUSY_POLL                     = 0x2e
+	SO_BUSY_POLL_BUDGET              = 0x46
 	SO_CNX_ADVICE                    = 0x35
 	SO_COOKIE                        = 0x39
 	SO_DETACH_REUSEPORT_BPF          = 0x44
@@ -297,6 +300,7 @@ const (
 	SO_PEERCRED                      = 0x11
 	SO_PEERGROUPS                    = 0x3b
 	SO_PEERSEC                       = 0x1f
+	SO_PREFER_BUSY_POLL              = 0x45
 	SO_PROTOCOL                      = 0x26
 	SO_RCVBUF                        = 0x8
 	SO_RCVBUFFORCE                   = 0x21

src/cmd/vendor/golang.org/x/sys/unix/zerrors_linux_arm64.go

@@ -4,7 +4,7 @@
 // +build arm64,linux
 
 // Code generated by cmd/cgo -godefs; DO NOT EDIT.
-// cgo -godefs -- -Wall -Werror -static -I/tmp/include -fsigned-char _const.go
+// cgo -godefs -- -Wall -Werror -static -I/tmp/include -fsigned-char /build/_const.go
 
 package unix
 
@@ -166,6 +166,7 @@ const (
 	PERF_EVENT_IOC_SET_OUTPUT        = 0x2405
 	PPPIOCATTACH                     = 0x4004743d
 	PPPIOCATTCHAN                    = 0x40047438
+	PPPIOCBRIDGECHAN                 = 0x40047435
 	PPPIOCCONNECT                    = 0x4004743a
 	PPPIOCDETACH                     = 0x4004743c
 	PPPIOCDISCONN                    = 0x7439
@@ -193,9 +194,13 @@ const (
 	PPPIOCSPASS                      = 0x40107447
 	PPPIOCSRASYNCMAP                 = 0x40047454
 	PPPIOCSXASYNCMAP                 = 0x4020744f
+	PPPIOCUNBRIDGECHAN               = 0x7434
 	PPPIOCXFERUNIT                   = 0x744e
 	PROT_BTI                         = 0x10
+	PROT_MTE                         = 0x20
 	PR_SET_PTRACER_ANY               = 0xffffffffffffffff
+	PTRACE_PEEKMTETAGS               = 0x21
+	PTRACE_POKEMTETAGS               = 0x22
 	PTRACE_SYSEMU                    = 0x1f
 	PTRACE_SYSEMU_SINGLESTEP         = 0x20
 	RLIMIT_AS                        = 0x9
@@ -262,6 +267,7 @@ const (
 	SO_BROADCAST                     = 0x6
 	SO_BSDCOMPAT                     = 0xe
 	SO_BUSY_POLL                     = 0x2e
+	SO_BUSY_POLL_BUDGET              = 0x46
 	SO_CNX_ADVICE                    = 0x35
 	SO_COOKIE                        = 0x39
 	SO_DETACH_REUSEPORT_BPF          = 0x44
@@ -284,6 +290,7 @@ const (
 	SO_PEERCRED                      = 0x11
 	SO_PEERGROUPS                    = 0x3b
 	SO_PEERSEC                       = 0x1f
+	SO_PREFER_BUSY_POLL              = 0x45
 	SO_PROTOCOL                      = 0x26
 	SO_RCVBUF                        = 0x8
 	SO_RCVBUFFORCE                   = 0x21

src/cmd/vendor/golang.org/x/sys/unix/zerrors_linux_mips.go

@@ -4,7 +4,7 @@
 // +build mips,linux
 
 // Code generated by cmd/cgo -godefs; DO NOT EDIT.
-// cgo -godefs -- -Wall -Werror -static -I/tmp/include _const.go
+// cgo -godefs -- -Wall -Werror -static -I/tmp/include /build/_const.go
 
 package unix
 
@@ -163,6 +163,7 @@ const (
 	PERF_EVENT_IOC_SET_OUTPUT        = 0x20002405
 	PPPIOCATTACH                     = 0x8004743d
 	PPPIOCATTCHAN                    = 0x80047438
+	PPPIOCBRIDGECHAN                 = 0x80047435
 	PPPIOCCONNECT                    = 0x8004743a
 	PPPIOCDETACH                     = 0x8004743c
 	PPPIOCDISCONN                    = 0x20007439
@@ -190,6 +191,7 @@ const (
 	PPPIOCSPASS                      = 0x80087447
 	PPPIOCSRASYNCMAP                 = 0x80047454
 	PPPIOCSXASYNCMAP                 = 0x8020744f
+	PPPIOCUNBRIDGECHAN               = 0x20007434
 	PPPIOCXFERUNIT                   = 0x2000744e
 	PR_SET_PTRACER_ANY               = 0xffffffff
 	PTRACE_GETFPREGS                 = 0xe
@@ -268,6 +270,7 @@ const (
 	SO_BROADCAST                     = 0x20
 	SO_BSDCOMPAT                     = 0xe
 	SO_BUSY_POLL                     = 0x2e
+	SO_BUSY_POLL_BUDGET              = 0x46
 	SO_CNX_ADVICE                    = 0x35
 	SO_COOKIE                        = 0x39
 	SO_DETACH_REUSEPORT_BPF          = 0x44
@@ -290,6 +293,7 @@ const (
 	SO_PEERCRED                      = 0x12
 	SO_PEERGROUPS                    = 0x3b
 	SO_PEERSEC                       = 0x1e
+	SO_PREFER_BUSY_POLL              = 0x45
 	SO_PROTOCOL                      = 0x1028
 	SO_RCVBUF                        = 0x1002
 	SO_RCVBUFFORCE                   = 0x21

src/cmd/vendor/golang.org/x/sys/unix/zerrors_linux_mips64.go

@@ -4,7 +4,7 @@
 // +build mips64,linux
 
 // Code generated by cmd/cgo -godefs; DO NOT EDIT.
-// cgo -godefs -- -Wall -Werror -static -I/tmp/include _const.go
+// cgo -godefs -- -Wall -Werror -static -I/tmp/include /build/_const.go
 
 package unix
 
@@ -163,6 +163,7 @@ const (
 	PERF_EVENT_IOC_SET_OUTPUT        = 0x20002405
 	PPPIOCATTACH                     = 0x8004743d
 	PPPIOCATTCHAN                    = 0x80047438
+	PPPIOCBRIDGECHAN                 = 0x80047435
 	PPPIOCCONNECT                    = 0x8004743a
 	PPPIOCDETACH                     = 0x8004743c
 	PPPIOCDISCONN                    = 0x20007439
@@ -190,6 +191,7 @@ const (
 	PPPIOCSPASS                      = 0x80107447
 	PPPIOCSRASYNCMAP                 = 0x80047454
 	PPPIOCSXASYNCMAP                 = 0x8020744f
+	PPPIOCUNBRIDGECHAN               = 0x20007434
 	PPPIOCXFERUNIT                   = 0x2000744e
 	PR_SET_PTRACER_ANY               = 0xffffffffffffffff
 	PTRACE_GETFPREGS                 = 0xe
@@ -268,6 +270,7 @@ const (
 	SO_BROADCAST                     = 0x20
 	SO_BSDCOMPAT                     = 0xe
 	SO_BUSY_POLL                     = 0x2e
+	SO_BUSY_POLL_BUDGET              = 0x46
 	SO_CNX_ADVICE                    = 0x35
 	SO_COOKIE                        = 0x39
 	SO_DETACH_REUSEPORT_BPF          = 0x44
@@ -290,6 +293,7 @@ const (
 	SO_PEERCRED                      = 0x12
 	SO_PEERGROUPS                    = 0x3b
 	SO_PEERSEC                       = 0x1e
+	SO_PREFER_BUSY_POLL              = 0x45
 	SO_PROTOCOL                      = 0x1028
 	SO_RCVBUF                        = 0x1002
 	SO_RCVBUFFORCE                   = 0x21

src/cmd/vendor/golang.org/x/sys/unix/zerrors_linux_mips64le.go

@@ -4,7 +4,7 @@
 // +build mips64le,linux
 
 // Code generated by cmd/cgo -godefs; DO NOT EDIT.
-// cgo -godefs -- -Wall -Werror -static -I/tmp/include _const.go
+// cgo -godefs -- -Wall -Werror -static -I/tmp/include /build/_const.go
 
 package unix
 
@@ -163,6 +163,7 @@ const (
 	PERF_EVENT_IOC_SET_OUTPUT        = 0x20002405
 	PPPIOCATTACH                     = 0x8004743d
 	PPPIOCATTCHAN                    = 0x80047438
+	PPPIOCBRIDGECHAN                 = 0x80047435
 	PPPIOCCONNECT                    = 0x8004743a
 	PPPIOCDETACH                     = 0x8004743c
 	PPPIOCDISCONN                    = 0x20007439
@@ -190,6 +191,7 @@ const (
 	PPPIOCSPASS                      = 0x80107447
 	PPPIOCSRASYNCMAP                 = 0x80047454
 	PPPIOCSXASYNCMAP                 = 0x8020744f
+	PPPIOCUNBRIDGECHAN               = 0x20007434
 	PPPIOCXFERUNIT                   = 0x2000744e
 	PR_SET_PTRACER_ANY               = 0xffffffffffffffff
 	PTRACE_GETFPREGS                 = 0xe
@@ -268,6 +270,7 @@ const (
 	SO_BROADCAST                     = 0x20
 	SO_BSDCOMPAT                     = 0xe
 	SO_BUSY_POLL                     = 0x2e
+	SO_BUSY_POLL_BUDGET              = 0x46
 	SO_CNX_ADVICE                    = 0x35
 	SO_COOKIE                        = 0x39
 	SO_DETACH_REUSEPORT_BPF          = 0x44
@@ -290,6 +293,7 @@ const (
 	SO_PEERCRED                      = 0x12
 	SO_PEERGROUPS                    = 0x3b
 	SO_PEERSEC                       = 0x1e
+	SO_PREFER_BUSY_POLL              = 0x45
 	SO_PROTOCOL                      = 0x1028
 	SO_RCVBUF                        = 0x1002
 	SO_RCVBUFFORCE                   = 0x21

src/cmd/vendor/golang.org/x/sys/unix/zerrors_linux_mipsle.go

@@ -4,7 +4,7 @@
 // +build mipsle,linux
 
 // Code generated by cmd/cgo -godefs; DO NOT EDIT.
-// cgo -godefs -- -Wall -Werror -static -I/tmp/include _const.go
+// cgo -godefs -- -Wall -Werror -static -I/tmp/include /build/_const.go
 
 package unix
 
@@ -163,6 +163,7 @@ const (
 	PERF_EVENT_IOC_SET_OUTPUT        = 0x20002405
 	PPPIOCATTACH                     = 0x8004743d
 	PPPIOCATTCHAN                    = 0x80047438
+	PPPIOCBRIDGECHAN                 = 0x80047435
 	PPPIOCCONNECT                    = 0x8004743a
 	PPPIOCDETACH                     = 0x8004743c
 	PPPIOCDISCONN                    = 0x20007439
@@ -190,6 +191,7 @@ const (
 	PPPIOCSPASS                      = 0x80087447
 	PPPIOCSRASYNCMAP                 = 0x80047454
 	PPPIOCSXASYNCMAP                 = 0x8020744f
+	PPPIOCUNBRIDGECHAN               = 0x20007434
 	PPPIOCXFERUNIT                   = 0x2000744e
 	PR_SET_PTRACER_ANY               = 0xffffffff
 	PTRACE_GETFPREGS                 = 0xe
@@ -268,6 +270,7 @@ const (
 	SO_BROADCAST                     = 0x20
 	SO_BSDCOMPAT                     = 0xe
 	SO_BUSY_POLL                     = 0x2e
+	SO_BUSY_POLL_BUDGET              = 0x46
 	SO_CNX_ADVICE                    = 0x35
 	SO_COOKIE                        = 0x39
 	SO_DETACH_REUSEPORT_BPF          = 0x44
@@ -290,6 +293,7 @@ const (
 	SO_PEERCRED                      = 0x12
 	SO_PEERGROUPS                    = 0x3b
 	SO_PEERSEC                       = 0x1e
+	SO_PREFER_BUSY_POLL              = 0x45
 	SO_PROTOCOL                      = 0x1028
 	SO_RCVBUF                        = 0x1002
 	SO_RCVBUFFORCE                   = 0x21

src/cmd/vendor/golang.org/x/sys/unix/zerrors_linux_ppc64.go

@@ -4,7 +4,7 @@
 // +build ppc64,linux
 
 // Code generated by cmd/cgo -godefs; DO NOT EDIT.
-// cgo -godefs -- -Wall -Werror -static -I/tmp/include _const.go
+// cgo -godefs -- -Wall -Werror -static -I/tmp/include /build/_const.go
 
 package unix
 
@@ -165,6 +165,7 @@ const (
 	PERF_EVENT_IOC_SET_OUTPUT        = 0x20002405
 	PPPIOCATTACH                     = 0x8004743d
 	PPPIOCATTCHAN                    = 0x80047438
+	PPPIOCBRIDGECHAN                 = 0x80047435
 	PPPIOCCONNECT                    = 0x8004743a
 	PPPIOCDETACH                     = 0x8004743c
 	PPPIOCDISCONN                    = 0x20007439
@@ -192,6 +193,7 @@ const (
 	PPPIOCSPASS                      = 0x80107447
 	PPPIOCSRASYNCMAP                 = 0x80047454
 	PPPIOCSXASYNCMAP                 = 0x8020744f
+	PPPIOCUNBRIDGECHAN               = 0x20007434
 	PPPIOCXFERUNIT                   = 0x2000744e
 	PROT_SAO                         = 0x10
 	PR_SET_PTRACER_ANY               = 0xffffffffffffffff
@@ -327,6 +329,7 @@ const (
 	SO_BROADCAST                     = 0x6
 	SO_BSDCOMPAT                     = 0xe
 	SO_BUSY_POLL                     = 0x2e
+	SO_BUSY_POLL_BUDGET              = 0x46
 	SO_CNX_ADVICE                    = 0x35
 	SO_COOKIE                        = 0x39
 	SO_DETACH_REUSEPORT_BPF          = 0x44
@@ -349,6 +352,7 @@ const (
 	SO_PEERCRED                      = 0x15
 	SO_PEERGROUPS                    = 0x3b
 	SO_PEERSEC                       = 0x1f
+	SO_PREFER_BUSY_POLL              = 0x45
 	SO_PROTOCOL                      = 0x26
 	SO_RCVBUF                        = 0x8
 	SO_RCVBUFFORCE                   = 0x21

src/cmd/vendor/golang.org/x/sys/unix/zerrors_linux_ppc64le.go

@@ -4,7 +4,7 @@
 // +build ppc64le,linux
 
 // Code generated by cmd/cgo -godefs; DO NOT EDIT.
-// cgo -godefs -- -Wall -Werror -static -I/tmp/include _const.go
+// cgo -godefs -- -Wall -Werror -static -I/tmp/include /build/_const.go
 
 package unix
 
@@ -165,6 +165,7 @@ const (
 	PERF_EVENT_IOC_SET_OUTPUT        = 0x20002405
 	PPPIOCATTACH                     = 0x8004743d
 	PPPIOCATTCHAN                    = 0x80047438
+	PPPIOCBRIDGECHAN                 = 0x80047435
 	PPPIOCCONNECT                    = 0x8004743a
 	PPPIOCDETACH                     = 0x8004743c
 	PPPIOCDISCONN                    = 0x20007439
@@ -192,6 +193,7 @@ const (
 	PPPIOCSPASS                      = 0x80107447
 	PPPIOCSRASYNCMAP                 = 0x80047454
 	PPPIOCSXASYNCMAP                 = 0x8020744f
+	PPPIOCUNBRIDGECHAN               = 0x20007434
 	PPPIOCXFERUNIT                   = 0x2000744e
 	PROT_SAO                         = 0x10
 	PR_SET_PTRACER_ANY               = 0xffffffffffffffff
@@ -327,6 +329,7 @@ const (
 	SO_BROADCAST                     = 0x6
 	SO_BSDCOMPAT                     = 0xe
 	SO_BUSY_POLL                     = 0x2e
+	SO_BUSY_POLL_BUDGET              = 0x46
 	SO_CNX_ADVICE                    = 0x35
 	SO_COOKIE                        = 0x39
 	SO_DETACH_REUSEPORT_BPF          = 0x44
@@ -349,6 +352,7 @@ const (
 	SO_PEERCRED                      = 0x15
 	SO_PEERGROUPS                    = 0x3b
 	SO_PEERSEC                       = 0x1f
+	SO_PREFER_BUSY_POLL              = 0x45
 	SO_PROTOCOL                      = 0x26
 	SO_RCVBUF                        = 0x8
 	SO_RCVBUFFORCE                   = 0x21

src/cmd/vendor/golang.org/x/sys/unix/zerrors_linux_riscv64.go

@@ -4,7 +4,7 @@
 // +build riscv64,linux
 
 // Code generated by cmd/cgo -godefs; DO NOT EDIT.
-// cgo -godefs -- -Wall -Werror -static -I/tmp/include _const.go
+// cgo -godefs -- -Wall -Werror -static -I/tmp/include /build/_const.go
 
 package unix
 
@@ -163,6 +163,7 @@ const (
 	PERF_EVENT_IOC_SET_OUTPUT        = 0x2405
 	PPPIOCATTACH                     = 0x4004743d
 	PPPIOCATTCHAN                    = 0x40047438
+	PPPIOCBRIDGECHAN                 = 0x40047435
 	PPPIOCCONNECT                    = 0x4004743a
 	PPPIOCDETACH                     = 0x4004743c
 	PPPIOCDISCONN                    = 0x7439
@@ -190,6 +191,7 @@ const (
 	PPPIOCSPASS                      = 0x40107447
 	PPPIOCSRASYNCMAP                 = 0x40047454
 	PPPIOCSXASYNCMAP                 = 0x4020744f
+	PPPIOCUNBRIDGECHAN               = 0x7434
 	PPPIOCXFERUNIT                   = 0x744e
 	PR_SET_PTRACER_ANY               = 0xffffffffffffffff
 	RLIMIT_AS                        = 0x9
@@ -256,6 +258,7 @@ const (
 	SO_BROADCAST                     = 0x6
 	SO_BSDCOMPAT                     = 0xe
 	SO_BUSY_POLL                     = 0x2e
+	SO_BUSY_POLL_BUDGET              = 0x46
 	SO_CNX_ADVICE                    = 0x35
 	SO_COOKIE                        = 0x39
 	SO_DETACH_REUSEPORT_BPF          = 0x44
@@ -278,6 +281,7 @@ const (
 	SO_PEERCRED                      = 0x11
 	SO_PEERGROUPS                    = 0x3b
 	SO_PEERSEC                       = 0x1f
+	SO_PREFER_BUSY_POLL              = 0x45
 	SO_PROTOCOL                      = 0x26
 	SO_RCVBUF                        = 0x8
 	SO_RCVBUFFORCE                   = 0x21

src/cmd/vendor/golang.org/x/sys/unix/zerrors_linux_s390x.go

@@ -4,7 +4,7 @@
 // +build s390x,linux
 
 // Code generated by cmd/cgo -godefs; DO NOT EDIT.
-// cgo -godefs -- -Wall -Werror -static -I/tmp/include -fsigned-char _const.go
+// cgo -godefs -- -Wall -Werror -static -I/tmp/include -fsigned-char /build/_const.go
 
 package unix
 
@@ -163,6 +163,7 @@ const (
 	PERF_EVENT_IOC_SET_OUTPUT        = 0x2405
 	PPPIOCATTACH                     = 0x4004743d
 	PPPIOCATTCHAN                    = 0x40047438
+	PPPIOCBRIDGECHAN                 = 0x40047435
 	PPPIOCCONNECT                    = 0x4004743a
 	PPPIOCDETACH                     = 0x4004743c
 	PPPIOCDISCONN                    = 0x7439
@@ -190,6 +191,7 @@ const (
 	PPPIOCSPASS                      = 0x40107447
 	PPPIOCSRASYNCMAP                 = 0x40047454
 	PPPIOCSXASYNCMAP                 = 0x4020744f
+	PPPIOCUNBRIDGECHAN               = 0x7434
 	PPPIOCXFERUNIT                   = 0x744e
 	PR_SET_PTRACER_ANY               = 0xffffffffffffffff
 	PTRACE_DISABLE_TE                = 0x5010
@@ -329,6 +331,7 @@ const (
 	SO_BROADCAST                     = 0x6
 	SO_BSDCOMPAT                     = 0xe
 	SO_BUSY_POLL                     = 0x2e
+	SO_BUSY_POLL_BUDGET              = 0x46
 	SO_CNX_ADVICE                    = 0x35
 	SO_COOKIE                        = 0x39
 	SO_DETACH_REUSEPORT_BPF          = 0x44
@@ -351,6 +354,7 @@ const (
 	SO_PEERCRED                      = 0x11
 	SO_PEERGROUPS                    = 0x3b
 	SO_PEERSEC                       = 0x1f
+	SO_PREFER_BUSY_POLL              = 0x45
 	SO_PROTOCOL                      = 0x26
 	SO_RCVBUF                        = 0x8
 	SO_RCVBUFFORCE                   = 0x21

src/cmd/vendor/golang.org/x/sys/unix/zerrors_linux_sparc64.go

@@ -4,7 +4,7 @@
 // +build sparc64,linux
 
 // Code generated by cmd/cgo -godefs; DO NOT EDIT.
-// cgo -godefs -- -Wall -Werror -static -I/tmp/include _const.go
+// cgo -godefs -- -Wall -Werror -static -I/tmp/include /build/_const.go
 
 package unix
 
@@ -168,6 +168,7 @@ const (
 	PERF_EVENT_IOC_SET_OUTPUT        = 0x20002405
 	PPPIOCATTACH                     = 0x8004743d
 	PPPIOCATTCHAN                    = 0x80047438
+	PPPIOCBRIDGECHAN                 = 0x80047435
 	PPPIOCCONNECT                    = 0x8004743a
 	PPPIOCDETACH                     = 0x8004743c
 	PPPIOCDISCONN                    = 0x20007439
@@ -195,6 +196,7 @@ const (
 	PPPIOCSPASS                      = 0x80107447
 	PPPIOCSRASYNCMAP                 = 0x80047454
 	PPPIOCSXASYNCMAP                 = 0x8020744f
+	PPPIOCUNBRIDGECHAN               = 0x20007434
 	PPPIOCXFERUNIT                   = 0x2000744e
 	PR_SET_PTRACER_ANY               = 0xffffffffffffffff
 	PTRACE_GETFPAREGS                = 0x14
@@ -322,6 +324,7 @@ const (
 	SO_BROADCAST                     = 0x20
 	SO_BSDCOMPAT                     = 0x400
 	SO_BUSY_POLL                     = 0x30
+	SO_BUSY_POLL_BUDGET              = 0x49
 	SO_CNX_ADVICE                    = 0x37
 	SO_COOKIE                        = 0x3b
 	SO_DETACH_REUSEPORT_BPF          = 0x47
@@ -344,6 +347,7 @@ const (
 	SO_PEERCRED                      = 0x40
 	SO_PEERGROUPS                    = 0x3d
 	SO_PEERSEC                       = 0x1e
+	SO_PREFER_BUSY_POLL              = 0x48
 	SO_PROTOCOL                      = 0x1028
 	SO_RCVBUF                        = 0x1002
 	SO_RCVBUFFORCE                   = 0x100b

src/cmd/vendor/golang.org/x/sys/unix/zsyscall_darwin_386.go

@@ -462,10 +462,8 @@ func libc_munlockall_trampoline()
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func pipe() (r int, w int, err error) {
+func pipe(p *[2]int32) (err error) {
-	r0, r1, e1 := syscall_rawSyscall(funcPC(libc_pipe_trampoline), 0, 0, 0)
+	_, _, e1 := syscall_rawSyscall(funcPC(libc_pipe_trampoline), uintptr(unsafe.Pointer(p)), 0, 0)
-	r = int(r0)
-	w = int(r1)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}
@@ -2381,7 +2379,7 @@ func libc_lstat64_trampoline()
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func ptrace(request int, pid int, addr uintptr, data uintptr) (err error) {
+func ptrace1(request int, pid int, addr uintptr, data uintptr) (err error) {
 	_, _, e1 := syscall_syscall6(funcPC(libc_ptrace_trampoline), uintptr(request), uintptr(pid), uintptr(addr), uintptr(data), 0, 0)
 	if e1 != 0 {
 		err = errnoErr(e1)

src/cmd/vendor/golang.org/x/sys/unix/zsyscall_darwin_amd64.go

@@ -462,10 +462,8 @@ func libc_munlockall_trampoline()
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func pipe() (r int, w int, err error) {
+func pipe(p *[2]int32) (err error) {
-	r0, r1, e1 := syscall_rawSyscall(funcPC(libc_pipe_trampoline), 0, 0, 0)
+	_, _, e1 := syscall_rawSyscall(funcPC(libc_pipe_trampoline), uintptr(unsafe.Pointer(p)), 0, 0)
-	r = int(r0)
-	w = int(r1)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}
@@ -2381,7 +2379,7 @@ func libc_lstat64_trampoline()
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func ptrace(request int, pid int, addr uintptr, data uintptr) (err error) {
+func ptrace1(request int, pid int, addr uintptr, data uintptr) (err error) {
 	_, _, e1 := syscall_syscall6(funcPC(libc_ptrace_trampoline), uintptr(request), uintptr(pid), uintptr(addr), uintptr(data), 0, 0)
 	if e1 != 0 {
 		err = errnoErr(e1)

src/cmd/vendor/golang.org/x/sys/unix/zsyscall_darwin_arm.go

@@ -462,10 +462,8 @@ func libc_munlockall_trampoline()
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func pipe() (r int, w int, err error) {
+func pipe(p *[2]int32) (err error) {
-	r0, r1, e1 := syscall_rawSyscall(funcPC(libc_pipe_trampoline), 0, 0, 0)
+	_, _, e1 := syscall_rawSyscall(funcPC(libc_pipe_trampoline), uintptr(unsafe.Pointer(p)), 0, 0)
-	r = int(r0)
-	w = int(r1)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}

src/cmd/vendor/golang.org/x/sys/unix/zsyscall_darwin_arm64.go

@@ -462,10 +462,8 @@ func libc_munlockall_trampoline()
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func pipe() (r int, w int, err error) {
+func pipe(p *[2]int32) (err error) {
-	r0, r1, e1 := syscall_rawSyscall(funcPC(libc_pipe_trampoline), 0, 0, 0)
+	_, _, e1 := syscall_rawSyscall(funcPC(libc_pipe_trampoline), uintptr(unsafe.Pointer(p)), 0, 0)
-	r = int(r0)
-	w = int(r1)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}
@@ -2381,7 +2379,7 @@ func libc_lstat_trampoline()
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func ptrace(request int, pid int, addr uintptr, data uintptr) (err error) {
+func ptrace1(request int, pid int, addr uintptr, data uintptr) (err error) {
 	_, _, e1 := syscall_syscall6(funcPC(libc_ptrace_trampoline), uintptr(request), uintptr(pid), uintptr(addr), uintptr(data), 0, 0)
 	if e1 != 0 {
 		err = errnoErr(e1)

src/cmd/vendor/golang.org/x/sys/unix/zsyscall_dragonfly_amd64.go

@@ -362,8 +362,10 @@ func pipe() (r int, w int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func pipe2(p *[2]_C_int, flags int) (err error) {
+func pipe2(flags int) (r int, w int, err error) {
-	_, _, e1 := RawSyscall(SYS_PIPE2, uintptr(unsafe.Pointer(p)), uintptr(flags), 0)
+	r0, r1, e1 := RawSyscall(SYS_PIPE2, uintptr(flags), 0, 0)
+	r = int(r0)
+	w = int(r1)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}

src/cmd/vendor/golang.org/x/sys/unix/zsyscall_illumos_amd64.go

@@ -14,22 +14,19 @@ import (
 //go:cgo_import_dynamic libc_writev writev "libc.so"
 //go:cgo_import_dynamic libc_pwritev pwritev "libc.so"
 //go:cgo_import_dynamic libc_accept4 accept4 "libsocket.so"
-//go:cgo_import_dynamic libc_pipe2 pipe2 "libc.so"
 
 //go:linkname procreadv libc_readv
 //go:linkname procpreadv libc_preadv
 //go:linkname procwritev libc_writev
 //go:linkname procpwritev libc_pwritev
 //go:linkname procaccept4 libc_accept4
-//go:linkname procpipe2 libc_pipe2
 
 var (
 	procreadv,
 	procpreadv,
 	procwritev,
 	procpwritev,
-	procaccept4,
+	procaccept4 syscallFunc
-	procpipe2 syscallFunc
 )
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
@@ -102,13 +99,3 @@ func accept4(s int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (fd int,
 	}
 	return
 }
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
-func pipe2(p *[2]_C_int, flags int) (err error) {
-	_, _, e1 := rawSysvicall6(uintptr(unsafe.Pointer(&procpipe2)), 2, uintptr(unsafe.Pointer(p)), uintptr(flags), 0, 0, 0, 0)
-	if e1 != 0 {
-		err = e1
-	}
-	return
-}

src/cmd/vendor/golang.org/x/sys/unix/zsyscall_netbsd_386.go

@@ -362,6 +362,16 @@ func pipe() (fd1 int, fd2 int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func pipe2(p *[2]_C_int, flags int) (err error) {
+	_, _, e1 := RawSyscall(SYS_PIPE2, uintptr(unsafe.Pointer(p)), uintptr(flags), 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Getdents(fd int, buf []byte) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(buf) > 0 {

src/cmd/vendor/golang.org/x/sys/unix/zsyscall_netbsd_amd64.go

@@ -362,6 +362,16 @@ func pipe() (fd1 int, fd2 int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func pipe2(p *[2]_C_int, flags int) (err error) {
+	_, _, e1 := RawSyscall(SYS_PIPE2, uintptr(unsafe.Pointer(p)), uintptr(flags), 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Getdents(fd int, buf []byte) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(buf) > 0 {

src/cmd/vendor/golang.org/x/sys/unix/zsyscall_netbsd_arm.go

@@ -362,6 +362,16 @@ func pipe() (fd1 int, fd2 int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func pipe2(p *[2]_C_int, flags int) (err error) {
+	_, _, e1 := RawSyscall(SYS_PIPE2, uintptr(unsafe.Pointer(p)), uintptr(flags), 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Getdents(fd int, buf []byte) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(buf) > 0 {

src/cmd/vendor/golang.org/x/sys/unix/zsyscall_netbsd_arm64.go

@@ -362,6 +362,16 @@ func pipe() (fd1 int, fd2 int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func pipe2(p *[2]_C_int, flags int) (err error) {
+	_, _, e1 := RawSyscall(SYS_PIPE2, uintptr(unsafe.Pointer(p)), uintptr(flags), 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Getdents(fd int, buf []byte) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(buf) > 0 {

src/cmd/vendor/golang.org/x/sys/unix/zsyscall_solaris_amd64.go

@@ -11,6 +11,7 @@ import (
 )
 
 //go:cgo_import_dynamic libc_pipe pipe "libc.so"
+//go:cgo_import_dynamic libc_pipe2 pipe2 "libc.so"
 //go:cgo_import_dynamic libc_getsockname getsockname "libsocket.so"
 //go:cgo_import_dynamic libc_getcwd getcwd "libc.so"
 //go:cgo_import_dynamic libc_getgroups getgroups "libc.so"
@@ -114,6 +115,7 @@ import (
 //go:cgo_import_dynamic libc_statvfs statvfs "libc.so"
 //go:cgo_import_dynamic libc_symlink symlink "libc.so"
 //go:cgo_import_dynamic libc_sync sync "libc.so"
+//go:cgo_import_dynamic libc_sysconf sysconf "libc.so"
 //go:cgo_import_dynamic libc_times times "libc.so"
 //go:cgo_import_dynamic libc_truncate truncate "libc.so"
 //go:cgo_import_dynamic libc_fsync fsync "libc.so"
@@ -140,6 +142,7 @@ import (
 //go:cgo_import_dynamic libc_recvfrom recvfrom "libsocket.so"
 
 //go:linkname procpipe libc_pipe
+//go:linkname procpipe2 libc_pipe2
 //go:linkname procgetsockname libc_getsockname
 //go:linkname procGetcwd libc_getcwd
 //go:linkname procgetgroups libc_getgroups
@@ -243,6 +246,7 @@ import (
 //go:linkname procStatvfs libc_statvfs
 //go:linkname procSymlink libc_symlink
 //go:linkname procSync libc_sync
+//go:linkname procSysconf libc_sysconf
 //go:linkname procTimes libc_times
 //go:linkname procTruncate libc_truncate
 //go:linkname procFsync libc_fsync
@@ -270,6 +274,7 @@ import (
 
 var (
 	procpipe,
+	procpipe2,
 	procgetsockname,
 	procGetcwd,
 	procgetgroups,
@@ -373,6 +378,7 @@ var (
 	procStatvfs,
 	procSymlink,
 	procSync,
+	procSysconf,
 	procTimes,
 	procTruncate,
 	procFsync,
@@ -412,6 +418,16 @@ func pipe(p *[2]_C_int) (n int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func pipe2(p *[2]_C_int, flags int) (err error) {
+	_, _, e1 := rawSysvicall6(uintptr(unsafe.Pointer(&procpipe2)), 2, uintptr(unsafe.Pointer(p)), uintptr(flags), 0, 0, 0, 0)
+	if e1 != 0 {
+		err = e1
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) {
 	_, _, e1 := sysvicall6(uintptr(unsafe.Pointer(&procgetsockname)), 3, uintptr(fd), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0)
 	if e1 != 0 {
@@ -1674,6 +1690,17 @@ func Sync() (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Sysconf(which int) (n int64, err error) {
+	r0, _, e1 := sysvicall6(uintptr(unsafe.Pointer(&procSysconf)), 1, uintptr(which), 0, 0, 0, 0, 0)
+	n = int64(r0)
+	if e1 != 0 {
+		err = e1
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Times(tms *Tms) (ticks uintptr, err error) {
 	r0, _, e1 := rawSysvicall6(uintptr(unsafe.Pointer(&procTimes)), 1, uintptr(unsafe.Pointer(tms)), 0, 0, 0, 0, 0)
 	ticks = uintptr(r0)

src/cmd/vendor/golang.org/x/sys/unix/zsysnum_linux_386.go

@@ -435,4 +435,6 @@ const (
 	SYS_OPENAT2                      = 437
 	SYS_PIDFD_GETFD                  = 438
 	SYS_FACCESSAT2                   = 439
+	SYS_PROCESS_MADVISE              = 440
+	SYS_EPOLL_PWAIT2                 = 441
 )

src/cmd/vendor/golang.org/x/sys/unix/zsysnum_linux_amd64.go

@@ -357,4 +357,6 @@ const (
 	SYS_OPENAT2                = 437
 	SYS_PIDFD_GETFD            = 438
 	SYS_FACCESSAT2             = 439
+	SYS_PROCESS_MADVISE        = 440
+	SYS_EPOLL_PWAIT2           = 441
 )

src/cmd/vendor/golang.org/x/sys/unix/zsysnum_linux_arm.go

@@ -399,4 +399,6 @@ const (
 	SYS_OPENAT2                      = 437
 	SYS_PIDFD_GETFD                  = 438
 	SYS_FACCESSAT2                   = 439
+	SYS_PROCESS_MADVISE              = 440
+	SYS_EPOLL_PWAIT2                 = 441
 )

src/cmd/vendor/golang.org/x/sys/unix/zsysnum_linux_arm64.go

@@ -302,4 +302,6 @@ const (
 	SYS_OPENAT2                = 437
 	SYS_PIDFD_GETFD            = 438
 	SYS_FACCESSAT2             = 439
+	SYS_PROCESS_MADVISE        = 440
+	SYS_EPOLL_PWAIT2           = 441
 )

src/cmd/vendor/golang.org/x/sys/unix/zsysnum_linux_mips.go

@@ -420,4 +420,6 @@ const (
 	SYS_OPENAT2                      = 4437
 	SYS_PIDFD_GETFD                  = 4438
 	SYS_FACCESSAT2                   = 4439
+	SYS_PROCESS_MADVISE              = 4440
+	SYS_EPOLL_PWAIT2                 = 4441
 )

src/cmd/vendor/golang.org/x/sys/unix/zsysnum_linux_mips64.go

@@ -350,4 +350,6 @@ const (
 	SYS_OPENAT2                = 5437
 	SYS_PIDFD_GETFD            = 5438
 	SYS_FACCESSAT2             = 5439
+	SYS_PROCESS_MADVISE        = 5440
+	SYS_EPOLL_PWAIT2           = 5441
 )

src/cmd/vendor/golang.org/x/sys/unix/zsysnum_linux_mips64le.go

@@ -350,4 +350,6 @@ const (
 	SYS_OPENAT2                = 5437
 	SYS_PIDFD_GETFD            = 5438
 	SYS_FACCESSAT2             = 5439
+	SYS_PROCESS_MADVISE        = 5440
+	SYS_EPOLL_PWAIT2           = 5441
 )

src/cmd/vendor/golang.org/x/sys/unix/zsysnum_linux_mipsle.go

@@ -420,4 +420,6 @@ const (
 	SYS_OPENAT2                      = 4437
 	SYS_PIDFD_GETFD                  = 4438
 	SYS_FACCESSAT2                   = 4439
+	SYS_PROCESS_MADVISE              = 4440
+	SYS_EPOLL_PWAIT2                 = 4441
 )

src/cmd/vendor/golang.org/x/sys/unix/zsysnum_linux_ppc64.go

@@ -399,4 +399,6 @@ const (
 	SYS_OPENAT2                = 437
 	SYS_PIDFD_GETFD            = 438
 	SYS_FACCESSAT2             = 439
+	SYS_PROCESS_MADVISE        = 440
+	SYS_EPOLL_PWAIT2           = 441
 )

src/cmd/vendor/golang.org/x/sys/unix/zsysnum_linux_ppc64le.go

@@ -399,4 +399,6 @@ const (
 	SYS_OPENAT2                = 437
 	SYS_PIDFD_GETFD            = 438
 	SYS_FACCESSAT2             = 439
+	SYS_PROCESS_MADVISE        = 440
+	SYS_EPOLL_PWAIT2           = 441
 )

src/cmd/vendor/golang.org/x/sys/unix/zsysnum_linux_riscv64.go

@@ -301,4 +301,6 @@ const (
 	SYS_OPENAT2                = 437
 	SYS_PIDFD_GETFD            = 438
 	SYS_FACCESSAT2             = 439
+	SYS_PROCESS_MADVISE        = 440
+	SYS_EPOLL_PWAIT2           = 441
 )

src/cmd/vendor/golang.org/x/sys/unix/zsysnum_linux_s390x.go

@@ -364,4 +364,6 @@ const (
 	SYS_OPENAT2                = 437
 	SYS_PIDFD_GETFD            = 438
 	SYS_FACCESSAT2             = 439
+	SYS_PROCESS_MADVISE        = 440
+	SYS_EPOLL_PWAIT2           = 441
 )

src/cmd/vendor/golang.org/x/sys/unix/zsysnum_linux_sparc64.go

@@ -378,4 +378,6 @@ const (
 	SYS_OPENAT2                = 437
 	SYS_PIDFD_GETFD            = 438
 	SYS_FACCESSAT2             = 439
+	SYS_PROCESS_MADVISE        = 440
+	SYS_EPOLL_PWAIT2           = 441
 )

src/cmd/vendor/golang.org/x/sys/unix/ztypes_aix_ppc.go

@@ -219,6 +219,7 @@ const (
 	SizeofSockaddrUnix     = 0x401
 	SizeofSockaddrDatalink = 0x80
 	SizeofLinger           = 0x8
+	SizeofIovec            = 0x8
 	SizeofIPMreq           = 0x8
 	SizeofIPv6Mreq         = 0x14
 	SizeofIPv6MTUInfo      = 0x20

src/cmd/vendor/golang.org/x/sys/unix/ztypes_aix_ppc64.go

@@ -223,6 +223,7 @@ const (
 	SizeofSockaddrUnix     = 0x401
 	SizeofSockaddrDatalink = 0x80
 	SizeofLinger           = 0x8
+	SizeofIovec            = 0x10
 	SizeofIPMreq           = 0x8
 	SizeofIPv6Mreq         = 0x14
 	SizeofIPv6MTUInfo      = 0x20

src/cmd/vendor/golang.org/x/sys/unix/ztypes_darwin_amd64.go

@@ -210,6 +210,13 @@ type RawSockaddrCtl struct {
 
 type _Socklen uint32
 
+type Xucred struct {
+	Version uint32
+	Uid     uint32
+	Ngroups int16
+	Groups  [16]uint32
+}
+
 type Linger struct {
 	Onoff  int32
 	Linger int32
@@ -273,6 +280,7 @@ const (
 	SizeofSockaddrUnix     = 0x6a
 	SizeofSockaddrDatalink = 0x14
 	SizeofSockaddrCtl      = 0x20
+	SizeofXucred           = 0x4c
 	SizeofLinger           = 0x8
 	SizeofIovec            = 0x10
 	SizeofIPMreq           = 0x8

src/cmd/vendor/golang.org/x/sys/unix/ztypes_darwin_arm64.go

@@ -210,6 +210,13 @@ type RawSockaddrCtl struct {
 
 type _Socklen uint32
 
+type Xucred struct {
+	Version uint32
+	Uid     uint32
+	Ngroups int16
+	Groups  [16]uint32
+}
+
 type Linger struct {
 	Onoff  int32
 	Linger int32
@@ -273,6 +280,7 @@ const (
 	SizeofSockaddrUnix     = 0x6a
 	SizeofSockaddrDatalink = 0x14
 	SizeofSockaddrCtl      = 0x20
+	SizeofXucred           = 0x4c
 	SizeofLinger           = 0x8
 	SizeofIovec            = 0x10
 	SizeofIPMreq           = 0x8