sys/fuchsia: add Go script that generates fidl descriptions

4 files changed, 92 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index 976a7cf85..64bdef245 100644
--- a/Makefile
+++ b/Makefile
@@ -160,6 +160,10 @@ generate_go: bin/syz-sysgen format_cpp
 generate_sys: bin/syz-sysgen
 	bin/syz-sysgen
 
+generate_fidl:
+	$(GO) generate ./sys/fuchsia
+	$(MAKE) format_sys
+
 bin/syz-sysgen:
 	$(GO) build $(GOHOSTFLAGS) -o $@ ./sys/syz-sysgen
 
diff --git a/docs/fuchsia.md b/docs/fuchsia.md
index 44b6eeaff..ce7b82f1e 100644
--- a/docs/fuchsia.md
+++ b/docs/fuchsia.md
@@ -48,6 +48,14 @@ Run `syz-manager` with a config along the lines of:
 
 ## How to generate syscall description for FIDL
 
+Use `generate_fidl` target to automatically generate syscall descriptions for all the supported FIDL files.
+
+```bash
+make generate_fidl TARGETARCH=amd64 SOURCEDIR=/path/to/fuchsia/checkout
+```
+
+To manually generate syscall description for a given `.fidl` file, use the following instruction.
+
 FIDL files should first be compiled into FIDL intermediate representation (JSON) files using `fidlc`:
 
 ```bash
diff --git a/sys/fuchsia/fidlgen/main.go b/sys/fuchsia/fidlgen/main.go
new file mode 100644
index 000000000..38189bae8
--- /dev/null
+++ b/sys/fuchsia/fidlgen/main.go
@@ -0,0 +1,78 @@
+// Copyright 2018 syzkaller project authors. All rights reserved.
+// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
+
+package main
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+
+	"github.com/google/syzkaller/pkg/osutil"
+	"github.com/google/syzkaller/sys/targets"
+)
+
+var zirconLibs = []string{
+	"fuchsia-process",
+	"fuchsia-io",
+}
+
+func main() {
+	targetArch := os.Getenv("TARGETARCH")
+	target := targets.Get("fuchsia", targetArch)
+	if target == nil {
+		failf("unknown TARGETARCH %s", targetArch)
+	}
+	arch := target.KernelHeaderArch
+
+	sourceDir := os.Getenv("SOURCEDIR")
+	if !osutil.IsExist(sourceDir) {
+		failf("cannot find SOURCEDIR %s", sourceDir)
+	}
+
+	fidlgenPath := filepath.Join(
+		sourceDir,
+		"out",
+		arch,
+		fmt.Sprintf("host_%s", arch),
+		"fidlgen",
+	)
+	if !osutil.IsExist(fidlgenPath) {
+		failf("cannot find fidlgen %s", fidlgenPath)
+	}
+
+	for _, lib := range zirconLibs {
+		jsonPath := filepath.Join(
+			sourceDir,
+			"out",
+			arch,
+			"fidling/gen/zircon/public/fidl",
+			lib,
+			fmt.Sprintf("%s.fidl.json", lib),
+		)
+
+		if !osutil.IsExist(jsonPath) {
+			failf("cannot find %s", jsonPath)
+		}
+
+		txtPath := strings.Replace(lib, "fuchsia-", "fidl_", 1)
+		_, err := osutil.RunCmd(time.Minute, "",
+			fidlgenPath,
+			"-generators", "syzkaller",
+			"-json", jsonPath,
+			"-output-base", txtPath,
+			"-include-base", txtPath,
+		)
+
+		if err != nil {
+			failf("fidlgen failed: %v\n", err)
+		}
+	}
+}
+
+func failf(msg string, args ...interface{}) {
+	fmt.Fprintf(os.Stderr, msg+"\n", args...)
+	os.Exit(1)
+}
diff --git a/sys/fuchsia/init.go b/sys/fuchsia/init.go
index eefba3950..30cb3d7d1 100644
--- a/sys/fuchsia/init.go
+++ b/sys/fuchsia/init.go
@@ -1,6 +1,8 @@
 // Copyright 2017 syzkaller project authors. All rights reserved.
 // Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
 
+//go:generate go run fidlgen/main.go
+
 package fuchsia
 
 import (