1 files changed, 33 insertions, 0 deletions
diff --git a/debug/risc-v-gsp-rm-vm/examples/scripts/dump_diff.py b/debug/risc-v-gsp-rm-vm/examples/scripts/dump_diff.py
new file mode 100644
index 0000000..329ffb1
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+++ b/debug/risc-v-gsp-rm-vm/examples/scripts/dump_diff.py
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+"""Snapshot-diff the uproc control block across a host-injected PING.
+
+Run from the tool root:
+
+    ./greeneye.sh run examples/scripts/dump_diff.py
+
+Demonstrates: symbol -> structure schema decoding, snapshot + diff, host
+stimulus via memory writes, and symbol-annotated output.
+"""
+import json
+from pathlib import Path
+
+from greeneye import Memory
+from greeneye.structs import render, schema_from_json
+
+TOOL_ROOT = Path(__file__).resolve().parents[2]
+schema = schema_from_json(json.loads((TOOL_ROOT / "firmware/uproc_demo/gsp_ctrl.schema.json").read_text()))
+ctrl = symbols.lookup("gsp_ctrl")
+
+# Let the firmware self-test settle.
+s.run(duration=0.4)
+before = s.snapshot(ctrl, schema.size, "ctrl-before-ping")
+
+# Host stimulus: PING with argument 0x1234.
+memory.write_u64(ctrl + 32, 1)   # mailbox
+memory.write_u64(ctrl + 40, 0x1234)
+s.run(duration=0.4)
+after = s.snapshot(ctrl, schema.size, "ctrl-after-ping")
+
+print("decoded control block:")
+print(render(schema, schema.decode(after, base=ctrl)))
+print("\nchanged bytes:")
+print(Memory.render_diff(Memory.diff(before, after, base=ctrl), symbols))