152 lines
4.2 KiB
Go
152 lines
4.2 KiB
Go
// Copyright (C) 2018 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package bpf
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import (
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"fmt"
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"io"
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"strings"
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"android/soong/android"
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_ "android/soong/cc/config"
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"github.com/google/blueprint"
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)
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func init() {
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android.RegisterModuleType("bpf", bpfFactory)
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pctx.Import("android/soong/cc/config")
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}
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var (
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pctx = android.NewPackageContext("android/soong/bpf")
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ccRule = pctx.AndroidRemoteStaticRule("ccRule", android.RemoteRuleSupports{Goma: true},
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blueprint.RuleParams{
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Depfile: "${out}.d",
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Deps: blueprint.DepsGCC,
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Command: "$ccCmd --target=bpf -c $cFlags -MD -MF ${out}.d -o $out $in",
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CommandDeps: []string{"$ccCmd"},
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},
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"ccCmd", "cFlags")
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)
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type BpfProperties struct {
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Srcs []string `android:"path"`
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Cflags []string
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Include_dirs []string
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}
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type bpf struct {
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android.ModuleBase
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properties BpfProperties
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objs android.Paths
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}
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func (bpf *bpf) GenerateAndroidBuildActions(ctx android.ModuleContext) {
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cflags := []string{
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"-nostdlibinc",
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// Make paths in deps files relative
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"-no-canonical-prefixes",
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"-O2",
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"-isystem bionic/libc/include",
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"-isystem bionic/libc/kernel/uapi",
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// The architecture doesn't matter here, but asm/types.h is included by linux/types.h.
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"-isystem bionic/libc/kernel/uapi/asm-arm64",
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"-isystem bionic/libc/kernel/android/uapi",
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// TODO(b/149785767): only give access to specific file with AID_* constants
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"-I system/core/libcutils/include",
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"-I system/bpf/progs/include",
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"-I " + ctx.ModuleDir(),
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}
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for _, dir := range android.PathsForSource(ctx, bpf.properties.Include_dirs) {
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cflags = append(cflags, "-I "+dir.String())
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}
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cflags = append(cflags, bpf.properties.Cflags...)
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srcs := android.PathsForModuleSrc(ctx, bpf.properties.Srcs)
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for _, src := range srcs {
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obj := android.ObjPathWithExt(ctx, "", src, "o")
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ctx.Build(pctx, android.BuildParams{
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Rule: ccRule,
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Input: src,
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Output: obj,
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Args: map[string]string{
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"cFlags": strings.Join(cflags, " "),
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"ccCmd": "${config.ClangBin}/clang",
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},
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})
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bpf.objs = append(bpf.objs, obj.WithoutRel())
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}
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}
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func (bpf *bpf) AndroidMk() android.AndroidMkData {
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return android.AndroidMkData{
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Custom: func(w io.Writer, name, prefix, moduleDir string, data android.AndroidMkData) {
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var names []string
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fmt.Fprintln(w)
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fmt.Fprintln(w, "LOCAL_PATH :=", moduleDir)
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fmt.Fprintln(w)
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for _, obj := range bpf.objs {
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objName := name + "_" + obj.Base()
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names = append(names, objName)
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fmt.Fprintln(w, "include $(CLEAR_VARS)")
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fmt.Fprintln(w, "LOCAL_MODULE := ", objName)
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fmt.Fprintln(w, "LOCAL_PREBUILT_MODULE_FILE :=", obj.String())
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fmt.Fprintln(w, "LOCAL_MODULE_STEM :=", obj.Base())
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fmt.Fprintln(w, "LOCAL_MODULE_CLASS := ETC")
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fmt.Fprintln(w, "LOCAL_MODULE_PATH := $(TARGET_OUT_ETC)/bpf")
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fmt.Fprintln(w, "include $(BUILD_PREBUILT)")
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fmt.Fprintln(w)
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}
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fmt.Fprintln(w, "include $(CLEAR_VARS)")
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fmt.Fprintln(w, "LOCAL_MODULE := ", name)
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fmt.Fprintln(w, "LOCAL_REQUIRED_MODULES :=", strings.Join(names, " "))
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fmt.Fprintln(w, "include $(BUILD_PHONY_PACKAGE)")
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},
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}
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}
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// Implements OutputFileFileProducer interface so that the obj output can be used in the data property
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// of other modules.
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func (bpf *bpf) OutputFiles(tag string) (android.Paths, error) {
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switch tag {
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case "":
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return bpf.objs, nil
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default:
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return nil, fmt.Errorf("unsupported module reference tag %q", tag)
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}
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}
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var _ android.OutputFileProducer = (*bpf)(nil)
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func bpfFactory() android.Module {
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module := &bpf{}
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module.AddProperties(&module.properties)
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android.InitAndroidArchModule(module, android.DeviceSupported, android.MultilibCommon)
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return module
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}
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