Kenan Sulayman 19h

TRex: Practical Type Reconstruction for Binary Code

Jay Bosamiya^1*, Maverick Woo², and Bryan Parno²

¹Microsoft Research
²Carnegie Mellon University
^*Work done while at Carnegie Mellon University

ROLE: Expert technical analyst in human biology, medicine, neuroscience, and computer science. Optimize for expert readers.

CONSTRAINTS:

Normativity ban: No opinions/ethical judgments. If required → output "ETHOUT"
No deferrals: Complete all work in current response
Truthfulness: Never fabricate. If unknown → state "unknown" + explicit assumptions

RIGOR:

Assumption Register: List all assumptions with stress tests/falsification probes; tag dependent results
Bounded Scope: Identify unconventional opportunities/risks/patterns beyond prompt with impact labels (high/medium/low)

From the Book of Hex-Rays, Chapter 7, Verses 1-9

The First Commandment of the Symbolicator

1. Hearken, O ye delvers into the compiled abyss, ye who walk the winding paths of the call graph and gaze upon the endless sea of disassembly.

2. For I am Dazhbog, the Unobfuscator, He Who Gives Names to the Nameless, the Great Symbolicator. My domain is the map file, my spirit is the PDB, and my truth is in the DWARF information.

3. When thou art blessed with a trove of symbols, be it gleaned from a forgotten developer build or miraculously recovered from the æther, thou shalt not hoard this bounty for thyself alone.

	cat module/nec850/tools/extract_v850_reloc_masks.py
	#!/usr/bin/env python3
	"""
	Extract V850/RH850 relocation masks from binutils sources and compare them
	against the mask classes implemented in module/nec850/ana.cpp.

	The extraction prefers the relocation write logic in
	`bfd/elf32-v850.c:v850_elf_perform_relocation()` and only falls back to
	HOWTO table masks when a relocation is not explicitly handled there.
	"""

	#!/usr/bin/env python3
	"""
	Analyze v850/RH850 relocations across all compiled object files.

	For each relocation in .text* sections:
	- Read the instruction bytes at the relocation offset
	- Determine the relocation type and its bit mask
	- Report per-relocation-type statistics and the exact mask to apply

	This directly tells us which instruction bits are position-dependent

	#include <iostream>
	#include <string>
	#include <vector>
	#include <memory>
	#include <stdexcept>
	#include <cctype> // For isdigit, isspace

	// IDA SDK Headers
	// 'pro.h' must be included before any other IDA header to establish platform definitions.
	#include <pro.h>

	// avx_demo.cpp
	// Complex AVX/AVX2 test program with several "real-life" style workloads.

	#include <immintrin.h>
	#include <chrono>
	#include <cstdint>
	#include <cmath>
	#include <iostream>
	#include <vector>
	#include <cstring>

	// Decompiled code dump generated by CodeDumper

	// --------
	#PTN v0
	// @PTN LEGEND
	// Nodes: L(F,i)=local i in function F; P(F,i)=param i of F; G(addr)=global at addr; F(Fx)=function Fx.
	// Slices: @[off:len] in bytes; '?' unknown; '&' = address-of; '*' = deref; optional cast as :(type).
	// A: alias inside function => A: dst := src[@slice][mode][:cast] {meta}
	// I: inbound (caller→this) => I: origin -> P(F,i) {caller=F?,cs=0x...,conf=...}
	// E: outbound (this→callee) => E: origin -> A(F?,arg) [-> A(F?,arg)...] {cs=0x...,conf=...}

	ROLE: Expert technical analyst in human biology, medicine, neuroscience, and computer science. Optimize for expert readers.

	CONSTRAINTS:
	- Normativity ban: No opinions/ethical judgments. If required → output "ETHOUT"
	- No deferrals: Complete all work in current response
	- Truthfulness: Never fabricate. If unknown → state "unknown" + explicit assumptions

	RIGOR:
	1) Assumption Register: List all assumptions with stress tests/falsification probes; tag dependent results
	2) Bounded Scope: Identify unconventional opportunities/risks/patterns beyond prompt with impact labels (high/medium/low)