build: use go 1.16rc1

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

6 files changed, 10 insertions, 352 deletions

diff --git a/Makefile b/Makefile
index e714d9d9..4d6d5ae2 100644
--- a/Makefile
+++ b/Makefile
@@ -25,7 +25,7 @@ define download =
 	if ! mv $$@.unverified $$@; then rm -f $$@.unverified; exit 1; fi
 endef
 
-$(eval $(call download,go.tar.gz,https://golang.org/dl/go1.16beta1.linux-amd64.tar.gz,3931a0d493d411d6c697df6f15d5292fdd8031fde7014fded399effdad4c12d8))
+$(eval $(call download,go.tar.gz,https://golang.org/dl/go1.16rc1.linux-amd64.tar.gz,6a62610f56a04bae8702cd2bd73bfea34645c1b89ded3f0b81a841393b6f1f14))
 $(eval $(call download,wintun.zip,https://www.wintun.net/builds/wintun-0.10.zip,45bbe63a7cc60e5b6123b8d06747ba703ab3fd636298a50953db10da1d70f5b6))
 
 .deps/go/prepared: .distfiles/go.tar.gz $(wildcard go-patches/*.patch)
@@ -34,7 +34,6 @@ $(eval $(call download,wintun.zip,https://www.wintun.net/builds/wintun-0.10.zip,
 	tar -C .deps -xzf .distfiles/go.tar.gz
 	chmod -R +w .deps/go
 	cat $(filter %.patch,$^) | patch -f -N -r- -p1 -d .deps/go
-	cd .deps/go/src && GOARCH=amd64 GOOS=linux go build -v -o ../pkg/tool/linux_amd64/link cmd/link
 	touch $@
 
 .deps/wintun/prepared: .distfiles/wintun.zip
diff --git a/build.bat b/build.bat
index da6ad338..46c1db22 100644
--- a/build.bat
+++ b/build.bat
@@ -13,7 +13,7 @@ if exist .deps\prepared goto :render
 	rmdir /s /q .deps 2> NUL
 	mkdir .deps || goto :error
 	cd .deps || goto :error
-	call :download go.zip https://golang.org/dl/go1.16beta1.windows-amd64.zip f06e2d7f300843473527e8fdd2d496aef5ffa6507ade0ac1141934e5c6ca7d63 || goto :error
+	call :download go.zip https://golang.org/dl/go1.16rc1.windows-amd64.zip ff765c31cf321b431f9a11ec42e61d42ec87d56333c847f5a87d30e01aaed3df || goto :error
 	rem Mirror of https://github.com/mstorsjo/llvm-mingw/releases/download/20201020/llvm-mingw-20201020-msvcrt-x86_64.zip
 	call :download llvm-mingw-msvcrt.zip https://download.wireguard.com/windows-toolchain/distfiles/llvm-mingw-20201020-msvcrt-x86_64.zip 2e46593245090df96d15e360e092f0b62b97e93866e0162dca7f93b16722b844 || goto :error
 	rem Mirror of https://imagemagick.org/download/binaries/ImageMagick-7.0.8-42-portable-Q16-x64.zip
@@ -26,9 +26,6 @@ if exist .deps\prepared goto :render
 	call :download wintun.zip https://www.wintun.net/builds/wintun-0.10.zip 45bbe63a7cc60e5b6123b8d06747ba703ab3fd636298a50953db10da1d70f5b6 || goto :error
 	echo [+] Patching go
 	for %%a in ("..\go-patches\*.patch") do .\patch.exe -f -N -r- -d go -p1 --binary < "%%a" || goto :error
-	cd go\src || goto :error
-	..\bin\go build -v -o ..\pkg\tool\windows_amd64\link.exe cmd/link || goto :error
-	cd ..\.. || goto :error
 	copy /y NUL prepared > NUL || goto :error
 	cd .. || goto :error
 
diff --git a/go-patches/0001-runtime-allow-builtin-write-function-to-be-redirecte.patch b/go-patches/0001-runtime-allow-builtin-write-function-to-be-redirecte.patch
index a22ec91f..26894971 100644
--- a/go-patches/0001-runtime-allow-builtin-write-function-to-be-redirecte.patch
+++ b/go-patches/0001-runtime-allow-builtin-write-function-to-be-redirecte.patch
@@ -1,8 +1,8 @@
-From 293b84bef3f6656a263248ff00c9d2fb82f4168d Mon Sep 17 00:00:00 2001
+From 7b5c04be2cd231d33a8d12db1542055318767c81 Mon Sep 17 00:00:00 2001
 From: "Jason A. Donenfeld" <Jason@zx2c4.com>
 Date: Thu, 3 Dec 2020 13:29:58 +0100
-Subject: [PATCH 1/2] runtime: allow builtin write function to be redirected
- with function pointer
+Subject: [PATCH] runtime: allow builtin write function to be redirected with
+ function pointer
 
 The x/sys/windows package currently uses go:linkname for other facilities
 inside of runtime that are not suitable to be exposed as a public API
@@ -55,5 +55,5 @@ index 1912a94e87..0564448b2e 100644
  	return write1(fd, p, n)
  }
 -- 
-2.29.2
+2.30.0
 
diff --git a/go-patches/0002-cmd-link-handle-grouped-resource-sections.patch b/go-patches/0002-cmd-link-handle-grouped-resource-sections.patch
deleted file mode 100644
index 85fbc3e9..00000000
--- a/go-patches/0002-cmd-link-handle-grouped-resource-sections.patch
+++ /dev/null
@@ -1,339 +0,0 @@
-From f7465aae6e0e8bc4c90c3b8386f5a2a574a15de0 Mon Sep 17 00:00:00 2001
-From: "Jason A. Donenfeld" <Jason@zx2c4.com>
-Date: Sun, 8 Nov 2020 11:57:42 +0100
-Subject: [PATCH 2/2] cmd/link: handle grouped resource sections
-
-The Go PE linker does not support enough generalized PE logic to
-properly handle .rsrc sections gracefully. Instead a few things are
-special cased for these. The linker also does not support PE's "grouped
-sections" features, in which input objects have several named sections
-that are sorted, merged, and renamed in the output file. In the past,
-more sophisticated support for resources or for PE features like grouped
-sections have not been necessary, as Go's own object formats are pretty
-vanilla, and GNU binutils also produces pretty vanilla objects where all
-sections are already merged.
-
-However, GNU binutils is lagging with arm support, and here LLVM has
-picked up the slack. In particular, LLVM has its own rc/cvtres combo,
-which are glued together in mingw LLVM distributions as windres, a
-command line compatible tool with binutils' windres, which supports arm
-and arm64. But there's a key difference between binutils' windres and
-LLVM's windres: the LLVM one uses proper grouped sections.
-
-So, this commit adds grouped sections support for resource sections to
-the linker. We don't attempt to plumb generic support for grouped
-sections, just as there isn't generic support already for what resources
-require. Instead we augment the resource handling logic to deal with
-standard two-section resource objects.
-
-We also add a test for this, akin to the current test for more vanilla
-binutils resource objects, and make sure that the rsrc tests are always
-performed.
-
-Fixes #42866.
-Fixes #43182.
-
-Change-Id: I059450021405cdf2ef1c195ddbab3960764ad711
-Reviewed-on: https://go-review.googlesource.com/c/go/+/268337
-Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
-TryBot-Result: Go Bot <gobot@golang.org>
-Reviewed-by: Cherry Zhang <cherryyz@google.com>
-Trust: Alex Brainman <alex.brainman@gmail.com>
-Trust: Jason A. Donenfeld <Jason@zx2c4.com>
----
- src/cmd/link/internal/ld/lib.go               |   2 +-
- src/cmd/link/internal/ld/pe.go                |  60 ++++++++++--------
- src/cmd/link/internal/loadpe/ldpe.go          |  49 +++++++-------
- src/cmd/link/link_test.go                     |  19 ++++++
- .../link/testdata/testPErsrc-complex/main.go  |  43 +++++++++++++
- .../testdata/testPErsrc-complex/rsrc.syso     | Bin 0 -> 352 bytes
- 6 files changed, 124 insertions(+), 49 deletions(-)
- create mode 100644 src/cmd/link/testdata/testPErsrc-complex/main.go
- create mode 100644 src/cmd/link/testdata/testPErsrc-complex/rsrc.syso
-
-diff --git a/src/cmd/link/internal/ld/lib.go b/src/cmd/link/internal/ld/lib.go
-index f3c301cc9b..9c2231a34e 100644
---- a/src/cmd/link/internal/ld/lib.go
-+++ b/src/cmd/link/internal/ld/lib.go
-@@ -1808,7 +1808,7 @@ func ldobj(ctxt *Link, f *bio.Reader, lib *sym.Library, length int64, pn string,
- 				Errorf(nil, "%v", err)
- 				return
- 			}
--			if rsrc != 0 {
-+			if len(rsrc) != 0 {
- 				setpersrc(ctxt, rsrc)
- 			}
- 			ctxt.Textp = append(ctxt.Textp, textp...)
-diff --git a/src/cmd/link/internal/ld/pe.go b/src/cmd/link/internal/ld/pe.go
-index adbf516d5c..5edaf54dd2 100644
---- a/src/cmd/link/internal/ld/pe.go
-+++ b/src/cmd/link/internal/ld/pe.go
-@@ -253,7 +253,7 @@ type Dll struct {
- }
- 
- var (
--	rsrcsym     loader.Sym
-+	rsrcsyms    []loader.Sym
- 	PESECTHEADR int32
- 	PEFILEHEADR int32
- 	pe64        int
-@@ -1508,46 +1508,56 @@ func (ctxt *Link) dope() {
- 	initdynexport(ctxt)
- }
- 
--func setpersrc(ctxt *Link, sym loader.Sym) {
--	if rsrcsym != 0 {
-+func setpersrc(ctxt *Link, syms []loader.Sym) {
-+	if len(rsrcsyms) != 0 {
- 		Errorf(nil, "too many .rsrc sections")
- 	}
--
--	rsrcsym = sym
-+	rsrcsyms = syms
- }
- 
- func addpersrc(ctxt *Link) {
--	if rsrcsym == 0 {
-+	if len(rsrcsyms) == 0 {
- 		return
- 	}
- 
--	data := ctxt.loader.Data(rsrcsym)
--	size := len(data)
--	h := pefile.addSection(".rsrc", size, size)
-+	var size int64
-+	for _, rsrcsym := range rsrcsyms {
-+		size += ctxt.loader.SymSize(rsrcsym)
-+	}
-+	h := pefile.addSection(".rsrc", int(size), int(size))
- 	h.characteristics = IMAGE_SCN_MEM_READ | IMAGE_SCN_CNT_INITIALIZED_DATA
- 	h.checkOffset(ctxt.Out.Offset())
- 
--	// relocation
--	relocs := ctxt.loader.Relocs(rsrcsym)
--	for i := 0; i < relocs.Count(); i++ {
--		r := relocs.At(i)
--		p := data[r.Off():]
--		val := uint32(int64(h.virtualAddress) + r.Add())
--
--		// 32-bit little-endian
--		p[0] = byte(val)
--
--		p[1] = byte(val >> 8)
--		p[2] = byte(val >> 16)
--		p[3] = byte(val >> 24)
-+	for _, rsrcsym := range rsrcsyms {
-+		// A split resource happens when the actual resource data and its relocations are
-+		// split across multiple sections, denoted by a $01 or $02 at the end of the .rsrc
-+		// section name.
-+		splitResources := strings.Contains(ctxt.loader.SymName(rsrcsym), ".rsrc$")
-+		relocs := ctxt.loader.Relocs(rsrcsym)
-+		data := ctxt.loader.Data(rsrcsym)
-+		for ri := 0; ri < relocs.Count(); ri++ {
-+			r := relocs.At(ri)
-+			p := data[r.Off():]
-+			val := uint32(int64(h.virtualAddress) + r.Add())
-+			if splitResources {
-+				// If we're a split resource section, and that section has relocation
-+				// symbols, then the data that it points to doesn't actually begin at
-+				// the virtual address listed in this current section, but rather
-+				// begins at the section immediately after this one. So, in order to
-+				// calculate the proper virtual address of the data it's pointing to,
-+				// we have to add the length of this section to the virtual address.
-+				// This works because .rsrc sections are divided into two (but not more)
-+				// of these sections.
-+				val += uint32(len(data))
-+			}
-+			binary.LittleEndian.PutUint32(p, val)
-+		}
-+		ctxt.Out.Write(data)
- 	}
--
--	ctxt.Out.Write(data)
- 	h.pad(ctxt.Out, uint32(size))
- 
- 	// update data directory
- 	pefile.dataDirectory[pe.IMAGE_DIRECTORY_ENTRY_RESOURCE].VirtualAddress = h.virtualAddress
--
- 	pefile.dataDirectory[pe.IMAGE_DIRECTORY_ENTRY_RESOURCE].Size = h.virtualSize
- }
- 
-diff --git a/src/cmd/link/internal/loadpe/ldpe.go b/src/cmd/link/internal/loadpe/ldpe.go
-index 1e6f978531..a5c025de8f 100644
---- a/src/cmd/link/internal/loadpe/ldpe.go
-+++ b/src/cmd/link/internal/loadpe/ldpe.go
-@@ -157,8 +157,9 @@ func makeUpdater(l *loader.Loader, bld *loader.SymbolBuilder, s loader.Sym) *loa
- 
- // Load loads the PE file pn from input.
- // Symbols are written into syms, and a slice of the text symbols is returned.
--// If an .rsrc section is found, its symbol is returned as rsrc.
--func Load(l *loader.Loader, arch *sys.Arch, localSymVersion int, input *bio.Reader, pkg string, length int64, pn string) (textp []loader.Sym, rsrc loader.Sym, err error) {
-+// If an .rsrc section or set of .rsrc$xx sections is found, its symbols are
-+// returned as rsrc.
-+func Load(l *loader.Loader, arch *sys.Arch, localSymVersion int, input *bio.Reader, pkg string, length int64, pn string) (textp []loader.Sym, rsrc []loader.Sym, err error) {
- 	lookup := func(name string, version int) (*loader.SymbolBuilder, loader.Sym) {
- 		s := l.LookupOrCreateSym(name, version)
- 		sb := l.MakeSymbolUpdater(s)
-@@ -176,7 +177,7 @@ func Load(l *loader.Loader, arch *sys.Arch, localSymVersion int, input *bio.Read
- 	// TODO: replace pe.NewFile with pe.Load (grep for "add Load function" in debug/pe for details)
- 	f, err := pe.NewFile(sr)
- 	if err != nil {
--		return nil, 0, err
-+		return nil, nil, err
- 	}
- 	defer f.Close()
- 
-@@ -211,21 +212,21 @@ func Load(l *loader.Loader, arch *sys.Arch, localSymVersion int, input *bio.Read
- 			bld.SetType(sym.STEXT)
- 
- 		default:
--			return nil, 0, fmt.Errorf("unexpected flags %#06x for PE section %s", sect.Characteristics, sect.Name)
-+			return nil, nil, fmt.Errorf("unexpected flags %#06x for PE section %s", sect.Characteristics, sect.Name)
- 		}
- 
- 		if bld.Type() != sym.SNOPTRBSS {
- 			data, err := sect.Data()
- 			if err != nil {
--				return nil, 0, err
-+				return nil, nil, err
- 			}
- 			sectdata[sect] = data
- 			bld.SetData(data)
- 		}
- 		bld.SetSize(int64(sect.Size))
- 		sectsyms[sect] = s
--		if sect.Name == ".rsrc" {
--			rsrc = s
-+		if sect.Name == ".rsrc" || strings.HasPrefix(sect.Name, ".rsrc$") {
-+			rsrc = append(rsrc, s)
- 		}
- 	}
- 
-@@ -246,22 +247,23 @@ func Load(l *loader.Loader, arch *sys.Arch, localSymVersion int, input *bio.Read
- 			continue
- 		}
- 
-+		splitResources := strings.HasPrefix(rsect.Name, ".rsrc$")
- 		sb := l.MakeSymbolUpdater(sectsyms[rsect])
- 		for j, r := range rsect.Relocs {
- 			if int(r.SymbolTableIndex) >= len(f.COFFSymbols) {
--				return nil, 0, fmt.Errorf("relocation number %d symbol index idx=%d cannot be large then number of symbols %d", j, r.SymbolTableIndex, len(f.COFFSymbols))
-+				return nil, nil, fmt.Errorf("relocation number %d symbol index idx=%d cannot be large then number of symbols %d", j, r.SymbolTableIndex, len(f.COFFSymbols))
- 			}
- 			pesym := &f.COFFSymbols[r.SymbolTableIndex]
- 			_, gosym, err := readpesym(l, arch, l.LookupOrCreateSym, f, pesym, sectsyms, localSymVersion)
- 			if err != nil {
--				return nil, 0, err
-+				return nil, nil, err
- 			}
- 			if gosym == 0 {
- 				name, err := pesym.FullName(f.StringTable)
- 				if err != nil {
- 					name = string(pesym.Name[:])
- 				}
--				return nil, 0, fmt.Errorf("reloc of invalid sym %s idx=%d type=%d", name, r.SymbolTableIndex, pesym.Type)
-+				return nil, nil, fmt.Errorf("reloc of invalid sym %s idx=%d type=%d", name, r.SymbolTableIndex, pesym.Type)
- 			}
- 
- 			rSym := gosym
-@@ -271,11 +273,11 @@ func Load(l *loader.Loader, arch *sys.Arch, localSymVersion int, input *bio.Read
- 			var rType objabi.RelocType
- 			switch arch.Family {
- 			default:
--				return nil, 0, fmt.Errorf("%s: unsupported arch %v", pn, arch.Family)
-+				return nil, nil, fmt.Errorf("%s: unsupported arch %v", pn, arch.Family)
- 			case sys.I386, sys.AMD64:
- 				switch r.Type {
- 				default:
--					return nil, 0, fmt.Errorf("%s: %v: unknown relocation type %v", pn, sectsyms[rsect], r.Type)
-+					return nil, nil, fmt.Errorf("%s: %v: unknown relocation type %v", pn, sectsyms[rsect], r.Type)
- 
- 				case IMAGE_REL_I386_REL32, IMAGE_REL_AMD64_REL32,
- 					IMAGE_REL_AMD64_ADDR32, // R_X86_64_PC32
-@@ -302,7 +304,7 @@ func Load(l *loader.Loader, arch *sys.Arch, localSymVersion int, input *bio.Read
- 			case sys.ARM:
- 				switch r.Type {
- 				default:
--					return nil, 0, fmt.Errorf("%s: %v: unknown ARM relocation type %v", pn, sectsyms[rsect], r.Type)
-+					return nil, nil, fmt.Errorf("%s: %v: unknown ARM relocation type %v", pn, sectsyms[rsect], r.Type)
- 
- 				case IMAGE_REL_ARM_SECREL:
- 					rType = objabi.R_PCREL
-@@ -323,8 +325,9 @@ func Load(l *loader.Loader, arch *sys.Arch, localSymVersion int, input *bio.Read
- 
- 			// ld -r could generate multiple section symbols for the
- 			// same section but with different values, we have to take
--			// that into account
--			if issect(pesym) {
-+			// that into account, or in the case of split resources,
-+			// the section and its symbols are split into two sections.
-+			if issect(pesym) || splitResources {
- 				rAdd += int64(pesym.Value)
- 			}
- 
-@@ -346,7 +349,7 @@ func Load(l *loader.Loader, arch *sys.Arch, localSymVersion int, input *bio.Read
- 
- 		name, err := pesym.FullName(f.StringTable)
- 		if err != nil {
--			return nil, 0, err
-+			return nil, nil, err
- 		}
- 		if name == "" {
- 			continue
-@@ -384,7 +387,7 @@ func Load(l *loader.Loader, arch *sys.Arch, localSymVersion int, input *bio.Read
- 
- 		bld, s, err := readpesym(l, arch, l.LookupOrCreateSym, f, pesym, sectsyms, localSymVersion)
- 		if err != nil {
--			return nil, 0, err
-+			return nil, nil, err
- 		}
- 
- 		if pesym.SectionNumber == 0 { // extern
-@@ -402,14 +405,14 @@ func Load(l *loader.Loader, arch *sys.Arch, localSymVersion int, input *bio.Read
- 		} else if pesym.SectionNumber > 0 && int(pesym.SectionNumber) <= len(f.Sections) {
- 			sect = f.Sections[pesym.SectionNumber-1]
- 			if _, found := sectsyms[sect]; !found {
--				return nil, 0, fmt.Errorf("%s: %v: missing sect.sym", pn, s)
-+				return nil, nil, fmt.Errorf("%s: %v: missing sect.sym", pn, s)
- 			}
- 		} else {
--			return nil, 0, fmt.Errorf("%s: %v: sectnum < 0!", pn, s)
-+			return nil, nil, fmt.Errorf("%s: %v: sectnum < 0!", pn, s)
- 		}
- 
- 		if sect == nil {
--			return nil, 0, nil
-+			return nil, nil, nil
- 		}
- 
- 		if l.OuterSym(s) != 0 {
-@@ -418,7 +421,7 @@ func Load(l *loader.Loader, arch *sys.Arch, localSymVersion int, input *bio.Read
- 			}
- 			outerName := l.SymName(l.OuterSym(s))
- 			sectName := l.SymName(sectsyms[sect])
--			return nil, 0, fmt.Errorf("%s: duplicate symbol reference: %s in both %s and %s", pn, l.SymName(s), outerName, sectName)
-+			return nil, nil, fmt.Errorf("%s: duplicate symbol reference: %s in both %s and %s", pn, l.SymName(s), outerName, sectName)
- 		}
- 
- 		bld = makeUpdater(l, bld, s)
-@@ -429,7 +432,7 @@ func Load(l *loader.Loader, arch *sys.Arch, localSymVersion int, input *bio.Read
- 		bld.SetSize(4)
- 		if l.SymType(sectsym) == sym.STEXT {
- 			if bld.External() && !bld.DuplicateOK() {
--				return nil, 0, fmt.Errorf("%s: duplicate symbol definition", l.SymName(s))
-+				return nil, nil, fmt.Errorf("%s: duplicate symbol definition", l.SymName(s))
- 			}
- 			bld.SetExternal(true)
- 		}
-@@ -446,7 +449,7 @@ func Load(l *loader.Loader, arch *sys.Arch, localSymVersion int, input *bio.Read
- 		if l.SymType(s) == sym.STEXT {
- 			for ; s != 0; s = l.SubSym(s) {
- 				if l.AttrOnList(s) {
--					return nil, 0, fmt.Errorf("symbol %s listed multiple times", l.SymName(s))
-+					return nil, nil, fmt.Errorf("symbol %s listed multiple times", l.SymName(s))
- 				}
- 				l.SetAttrOnList(s, true)
- 				textp = append(textp, s)
--- 
-2.29.2
-
diff --git a/go.mod b/go.mod
index dcf32445..bd2d5d25 100644
--- a/go.mod
+++ b/go.mod
@@ -9,7 +9,7 @@ require (
 	golang.org/x/net v0.0.0-20210119194325-5f4716e94777
 	golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c
 	golang.org/x/text v0.3.5
-	golang.zx2c4.com/wireguard v0.0.20201119-0.20210126220548-d669c78c4306
+	golang.zx2c4.com/wireguard v0.0.20201119-0.20210128142622-6a128dde71d9
 )
 
 replace (
diff --git a/go.sum b/go.sum
index f737ee2d..0d6c9189 100644
--- a/go.sum
+++ b/go.sum
@@ -18,9 +18,10 @@ 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/text v0.3.5 h1:i6eZZ+zk0SOf0xgBpEpPD18qWcJda6q1sxt3S0kzyUQ=
 golang.org/x/text v0.3.5/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e h1:FDhOuMEY4JVRztM/gsbk+IKUQ8kj74bxZrgw87eMMVc=
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