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