ebpf: add Windows support

.github/workflows/ci.yml

@@ -346,6 +346,7 @@ jobs:
         run: >
           gotestsum --raw-command --ignore-non-json-output-lines --junitfile junit.xml --
           go test -short -count 1 -json
+          ./
           ./asm
           ./btf
           ./internal

asm/func_win.go

@@ -0,0 +1,44 @@
+// Code generated by internal/cmd/genwinfunctions.awk; DO NOT EDIT.
+
+package asm
+
+// Code in this file is derived from eBPF for Windows, available under the MIT License.
+
+import (
+	"github.com/cilium/ebpf/internal/platform"
+)
+
+// Built-in functions (Windows).
+const (
+	WindowsFnMapLookupElem          = BuiltinFunc(platform.WindowsTag | 1)
+	WindowsFnMapUpdateElem          = BuiltinFunc(platform.WindowsTag | 2)
+	WindowsFnMapDeleteElem          = BuiltinFunc(platform.WindowsTag | 3)
+	WindowsFnMapLookupAndDeleteElem = BuiltinFunc(platform.WindowsTag | 4)
+	WindowsFnTailCall               = BuiltinFunc(platform.WindowsTag | 5)
+	WindowsFnGetPrandomU32          = BuiltinFunc(platform.WindowsTag | 6)
+	WindowsFnKtimeGetBootNs         = BuiltinFunc(platform.WindowsTag | 7)
+	WindowsFnGetSmpProcessorId      = BuiltinFunc(platform.WindowsTag | 8)
+	WindowsFnKtimeGetNs             = BuiltinFunc(platform.WindowsTag | 9)
+	WindowsFnCsumDiff               = BuiltinFunc(platform.WindowsTag | 10)
+	WindowsFnRingbufOutput          = BuiltinFunc(platform.WindowsTag | 11)
+	WindowsFnTracePrintk2           = BuiltinFunc(platform.WindowsTag | 12)
+	WindowsFnTracePrintk3           = BuiltinFunc(platform.WindowsTag | 13)
+	WindowsFnTracePrintk4           = BuiltinFunc(platform.WindowsTag | 14)
+	WindowsFnTracePrintk5           = BuiltinFunc(platform.WindowsTag | 15)
+	WindowsFnMapPushElem            = BuiltinFunc(platform.WindowsTag | 16)
+	WindowsFnMapPopElem             = BuiltinFunc(platform.WindowsTag | 17)
+	WindowsFnMapPeekElem            = BuiltinFunc(platform.WindowsTag | 18)
+	WindowsFnGetCurrentPidTgid      = BuiltinFunc(platform.WindowsTag | 19)
+	WindowsFnGetCurrentLogonId      = BuiltinFunc(platform.WindowsTag | 20)
+	WindowsFnIsCurrentAdmin         = BuiltinFunc(platform.WindowsTag | 21)
+	WindowsFnMemcpy                 = BuiltinFunc(platform.WindowsTag | 22)
+	WindowsFnMemcmp                 = BuiltinFunc(platform.WindowsTag | 23)
+	WindowsFnMemset                 = BuiltinFunc(platform.WindowsTag | 24)
+	WindowsFnMemmove                = BuiltinFunc(platform.WindowsTag | 25)
+	WindowsFnGetSocketCookie        = BuiltinFunc(platform.WindowsTag | 26)
+	WindowsFnStrncpyS               = BuiltinFunc(platform.WindowsTag | 27)
+	WindowsFnStrncatS               = BuiltinFunc(platform.WindowsTag | 28)
+	WindowsFnStrnlenS               = BuiltinFunc(platform.WindowsTag | 29)
+	WindowsFnKtimeGetBootMs         = BuiltinFunc(platform.WindowsTag | 30)
+	WindowsFnKtimeGetMs             = BuiltinFunc(platform.WindowsTag | 31)
+)

asm/instruction.go

@@ -11,6 +11,7 @@ import (
 	"sort"
 	"strings"
 
+	"github.com/cilium/ebpf/internal"
 	"github.com/cilium/ebpf/internal/platform"
 	"github.com/cilium/ebpf/internal/sys"
 )
@@ -144,7 +145,7 @@ func (ins Instruction) Marshal(w io.Writer, bo binary.ByteOrder) (uint64, error)
 		fn := BuiltinFunc(ins.Constant)
 		plat, value := platform.DecodeConstant(fn)
 		if plat != platform.Native {
-			return 0, fmt.Errorf("function %s is not supported on this platform", fn)
+			return 0, fmt.Errorf("function %s (%s): %w", fn, plat, internal.ErrNotSupportedOnOS)
 		}
 		cons = int32(value)
 	} else if ins.OpCode.Class().IsALU() {

collection.go

@@ -13,6 +13,7 @@ import (
 	"github.com/cilium/ebpf/internal/kallsyms"
 	"github.com/cilium/ebpf/internal/kconfig"
 	"github.com/cilium/ebpf/internal/linux"
+	"github.com/cilium/ebpf/internal/platform"
 	"github.com/cilium/ebpf/internal/sys"
 )
 
@@ -311,8 +312,7 @@ func (cs *CollectionSpec) LoadAndAssign(to interface{}, opts *CollectionOptions)
 
 	// Evaluate the loader's objects after all (lazy)loading has taken place.
 	for n, m := range loader.maps {
-		switch m.typ {
-		case ProgramArray:
+		if m.typ.canStoreProgram() {
 			// Require all lazy-loaded ProgramArrays to be assigned to the given object.
 			// The kernel empties a ProgramArray once the last user space reference
 			// to it closes, which leads to failed tail calls. Combined with the library
@@ -719,6 +719,10 @@ func resolveKconfig(m *MapSpec) error {
 		return errors.New("map value is not a Datasec")
 	}
 
+	if platform.IsWindows {
+		return fmt.Errorf(".kconfig: %w", internal.ErrNotSupportedOnOS)
+	}
+
 	type configInfo struct {
 		offset uint32
 		size   uint32