add busybox example script

2 files changed, 101 insertions, 1 deletions

diff --git a/README.md b/README.md
index 88b1128..9ac52b5 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,7 @@ To do so, it needs to support the **make**, **make clean**, **make randconfig**,
 **make nfpkeys** is expected to print a JSON dict with meta-data about those.
 All of these commands can be changed, see `bin/explore-kconfig.py --help`.
 
-See **examples/kconfig-static** for a simple example project, and [multipass](https://github.com/derf/multipass) and [kratos](https://ess.cs.uos.de/git/software/kratos/kratos) for more complex ones.
+See **examples/kconfig-static** for a simple example project, and **examples/busybox.sh** for a more complex one.
 The `make_benchmark` section of **.gitlab-ci.yml** shows how to run benchmarks and generate a model for the example project.
 
 As benchmark generation employs frequent recompilation, using a tmpfs is recommended.
diff --git a/examples/busybox.sh b/examples/busybox.sh
new file mode 100755
index 0000000..3ad225f
--- /dev/null
+++ b/examples/busybox.sh
@@ -0,0 +1,100 @@
+#!/bin/sh
+
+set -ex
+
+wget https://busybox.net/downloads/busybox-1.35.0.tar.bz2
+tar xjf busybox-1.35.0.tar.bz2
+rm busybox-1.35.0.tar.bz2
+
+# Generate Config.in files
+( cd busybox-1.35.0 ; make gen_build_files )
+
+git clone --recursive https://ess.cs.uos.de/git/software/dfatool.git
+
+dfatool/bin/kconfig-expand-includes busybox-1.35.0/Config.in > busybox-1.35.0/Kconfig
+
+cat > busybox-1.35.0/Makefile.local << __EOF__
+.PHONY: nfpkeys
+nfpkeys:
+	@echo '{"ELF": {"Size": {"unit": "B", "description": "Binary Size", "minimize": true}, "RAM": {"unit": "B", "description": "static RAM", "minimize": true}}}'
+
+.PHONY: nfpvalues
+nfpvalues:
+	@scripts/nfpvalues.py size _ data,bss
+
+__EOF__
+
+cat > busybox-1.35.0/scripts/nfpvalues.py << __EOF__
+#!/usr/bin/env python3
+
+import json
+import re
+import subprocess
+import sys
+
+
+def main(size_executable, rom_sections, ram_sections):
+    rom_sections = rom_sections.split(",")
+    ram_sections = ram_sections.split(",")
+
+    status = subprocess.run(
+        [size_executable, "-A", "busybox"],
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE,
+        universal_newlines=True,
+    )
+
+    section_size = dict()
+
+    for line in status.stdout.split("\n"):
+        match = re.match("[.](\S+)\s+(\d+)", line)
+        if match:
+            section = match.group(1)
+            size = int(match.group(2))
+            section_size[section] = size
+
+    status = subprocess.run(
+        ["stat", "-c", "%s", "busybox"],
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE,
+        universal_newlines=True,
+    )
+    binary_size = int(status.stdout)
+
+    total = {
+        "Size": binary_size,
+        "RAM": sum(map(lambda section: section_size[section], ram_sections)),
+    }
+
+    output = {"ELF": total}
+
+    print(json.dumps(output))
+
+
+if __name__ == "__main__":
+    main(*sys.argv[1:])
+
+__EOF__
+
+chmod 755 busybox-1.35.0/scripts/nfpvalues.py
+
+set +ex
+
+cat <<__EOF__
+
+busybox has been prepared for dfatool data acquisition for NFP model generation.
+
+Example usage with random sampling (10,000 samples)
+
+> mkdir data
+> cd data
+> ../dfatool/bin/explore-kconfig.py --random 10000 ../busybox-1.35.0
+
+Alternatively, you can run multiple build processes in parallel.
+
+> for i in {1..10}; do rsync -a busybox-1.35.0/ busybox-build-\${i}/ ; done
+> mkdir data
+> cd data
+> for i in {1..10}; do ../dfatool/bin/explore-kconfig.py --random 1000 ../busybox-build-\${i} & done
+
+__EOF__