2 files changed, 106 insertions, 0 deletions
diff --git a/tools/nogo/objdump/BUILD b/tools/nogo/objdump/BUILD
new file mode 100644
index 000000000..da56efdf7
--- /dev/null
+++ b/tools/nogo/objdump/BUILD
@@ -0,0 +1,10 @@
+load("//tools:defs.bzl", "go_library")
+
+package(licenses = ["notice"])
+
+go_library(
+    name = "objdump",
+    srcs = ["objdump.go"],
+    nogo = False,
+    visibility = ["//tools:__subpackages__"],
+)
diff --git a/tools/nogo/objdump/objdump.go b/tools/nogo/objdump/objdump.go
new file mode 100644
index 000000000..48484abf3
--- /dev/null
+++ b/tools/nogo/objdump/objdump.go
@@ -0,0 +1,96 @@
+// Copyright 2020 The gVisor Authors.
+//
+// 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 objdump is a wrapper around relevant objdump flags.
+package objdump
+
+import (
+	"flag"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+)
+
+var (
+	// Binary is the binary under analysis.
+	//
+	// See Reader, below.
+	binary = flag.String("binary", "", "binary under analysis")
+
+	// Reader is the input stream.
+	//
+	// This may be set instead of Binary.
+	Reader io.Reader
+
+	// objdumpTool is the tool used to dump a binary.
+	objdumpTool = flag.String("objdump_tool", "", "tool used to dump a binary")
+)
+
+// LoadRaw reads the raw object output.
+func LoadRaw(fn func(r io.Reader) error) error {
+	var r io.Reader
+	if *binary != "" {
+		f, err := os.Open(*binary)
+		if err != nil {
+			return err
+		}
+		defer f.Close()
+		r = f
+	} else if Reader != nil {
+		r = Reader
+	} else {
+		// We have no input stream.
+		return fmt.Errorf("no binary or reader provided")
+	}
+	return fn(r)
+}
+
+// Load reads the objdump output.
+func Load(fn func(r io.Reader) error) error {
+	var (
+		args  []string
+		stdin io.Reader
+	)
+	if *binary != "" {
+		args = append(args, *binary)
+	} else if Reader != nil {
+		stdin = Reader
+	} else {
+		// We have no input stream or binary.
+		return fmt.Errorf("no binary or reader provided")
+	}
+
+	// Construct our command.
+	cmd := exec.Command(*objdumpTool, args...)
+	cmd.Stdin = stdin
+	cmd.Stderr = os.Stderr
+	out, err := cmd.StdoutPipe()
+	if err != nil {
+		return err
+	}
+	if err := cmd.Start(); err != nil {
+		return err
+	}
+
+	// Call the user hook.
+	userErr := fn(out)
+
+	// Wait for the dump to finish.
+	if err := cmd.Wait(); userErr == nil && err != nil {
+		return err
+	}
+
+	return userErr
+}