pkg/build: OpenBSD support, currently limited to building a kcov enabled kernel

2 files changed, 82 insertions, 0 deletions

diff --git a/pkg/build/build.go b/pkg/build/build.go
index 8882748b1..34015f3ab 100644
--- a/pkg/build/build.go
+++ b/pkg/build/build.go
@@ -71,6 +71,8 @@ func getBuilder(targetOS, targetArch, vmType string) (builder, error) {
 		return fuchsia{}, nil
 	case targetOS == "akaros" && targetArch == "amd64" && vmType == "qemu":
 		return akaros{}, nil
+	case targetOS == "openbsd" && targetArch == "amd64" && vmType == "vmm":
+		return openbsd{}, nil
 	default:
 		return nil, fmt.Errorf("unsupported image type %v/%v/%v", targetOS, targetArch, vmType)
 	}
diff --git a/pkg/build/openbsd.go b/pkg/build/openbsd.go
new file mode 100644
index 000000000..997227d36
--- /dev/null
+++ b/pkg/build/openbsd.go
@@ -0,0 +1,80 @@
+// 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 build
+
+import (
+	"fmt"
+	"path/filepath"
+	"runtime"
+	"strconv"
+	"time"
+
+	"github.com/google/syzkaller/pkg/osutil"
+)
+
+type openbsd struct{}
+
+func (ctx openbsd) build(targetArch, vmType, kernelDir, outputDir, compiler, userspaceDir,
+	cmdlineFile, sysctlFile string, config []byte) error {
+	const kernelName = "SYZKALLER"
+	confDir := fmt.Sprintf("%v/sys/arch/%v/conf", kernelDir, targetArch)
+	compileDir := fmt.Sprintf("%v/sys/arch/%v/compile/%v", kernelDir, targetArch, kernelName)
+
+	if err := ctx.configure(confDir, compileDir, kernelName); err != nil {
+		return err
+	}
+
+	if err := ctx.make(compileDir, "all"); err != nil {
+		return err
+	}
+
+	for src, dst := range map[string]string{
+		"obj/bsd":     "kernel",
+		"obj/bsd.gdb": "obj/bsd.gdb",
+	} {
+		fullSrc := filepath.Join(compileDir, src)
+		fullDst := filepath.Join(outputDir, dst)
+		if err := osutil.CopyFile(fullSrc, fullDst); err != nil {
+			return fmt.Errorf("failed to copy %v -> %v: %v", fullSrc, fullDst, err)
+		}
+	}
+
+	return nil
+}
+
+func (ctx openbsd) clean(kernelDir string) error {
+	return ctx.make(kernelDir, "", "clean")
+}
+
+func (ctx openbsd) configure(confDir, compileDir, kernelName string) error {
+	conf := []byte(`
+include "arch/amd64/conf/GENERIC"
+pseudo-device kcov 1
+`)
+	if err := osutil.WriteFile(filepath.Join(confDir, kernelName), conf); err != nil {
+		return err
+	}
+
+	if err := osutil.MkdirAll(compileDir); err != nil {
+		return err
+	}
+	makefile := []byte(".include \"../Makefile.inc\"\n")
+	if err := osutil.WriteFile(filepath.Join(compileDir, "Makefile"), makefile); err != nil {
+		return err
+	}
+	if err := ctx.make(compileDir, "obj"); err != nil {
+		return err
+	}
+	if err := ctx.make(compileDir, "config"); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (ctx openbsd) make(kernelDir string, args ...string) error {
+	args = append([]string{"-j", strconv.Itoa(runtime.NumCPU())}, args...)
+	_, err := osutil.RunCmd(10*time.Minute, kernelDir, "make", args...)
+	return err
+}