From 25cc02431b61097b2adfc2fbc493b648b0300c3b Mon Sep 17 00:00:00 2001
From: Mason Reed <mason@vector35.com>
Date: Mon, 10 Mar 2025 11:05:40 -0400
Subject: [SharedCache] Refactor Shared Cache

In absence of a better name, this commit refactors the shared cache code.
---
 view/sharedcache/core/MachO.h | 76 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 view/sharedcache/core/MachO.h

(limited to 'view/sharedcache/core/MachO.h')

diff --git a/view/sharedcache/core/MachO.h b/view/sharedcache/core/MachO.h
new file mode 100644
index 00000000..37b82915
--- /dev/null
+++ b/view/sharedcache/core/MachO.h
@@ -0,0 +1,76 @@
+#pragma once
+
+#include "VirtualMemory.h"
+
+// TODO: Including this adds a bunch of binary ninja specific stuff :ugh:
+#include "view/macho/machoview.h"
+
+struct CacheSymbol;
+
+struct SharedCacheMachOHeader
+{
+	uint64_t textBase = 0;
+	uint64_t loadCommandOffset = 0;
+	BinaryNinja::mach_header_64 ident;
+	// NOTE: This should never be empty.
+	std::string identifierPrefix;
+	std::string installName;
+
+	std::vector<std::pair<uint64_t, bool>> entryPoints;
+	std::vector<uint64_t> m_entryPoints;  // list of entrypoints
+
+	BinaryNinja::symtab_command symtab;
+	BinaryNinja::dysymtab_command dysymtab;
+	BinaryNinja::dyld_info_command dyldInfo;
+	BinaryNinja::routines_command_64 routines64;
+	BinaryNinja::function_starts_command functionStarts;
+	std::vector<BinaryNinja::section_64> moduleInitSections;
+	BinaryNinja::linkedit_data_command exportTrie;
+	BinaryNinja::linkedit_data_command chainedFixups {};
+
+	uint64_t relocationBase;
+	// Section and program headers, internally use 64-bit form as it is a superset of 32-bit
+	std::vector<BinaryNinja::segment_command_64> segments;  // only three types of sections __TEXT, __DATA, __IMPORT
+	BinaryNinja::segment_command_64 linkeditSegment;
+	std::vector<BinaryNinja::section_64> sections;
+	std::vector<std::string> sectionNames;
+
+	std::vector<BinaryNinja::section_64> symbolStubSections;
+	std::vector<BinaryNinja::section_64> symbolPointerSections;
+
+	std::vector<std::string> dylibs;
+
+	BinaryNinja::build_version_command buildVersion;
+	std::vector<BinaryNinja::build_tool_version> buildToolVersions;
+
+	std::string exportTriePath;
+
+	bool linkeditPresent = false;
+	bool dysymPresent = false;
+	bool dyldInfoPresent = false;
+	bool exportTriePresent = false;
+	bool chainedFixupsPresent = false;
+	bool routinesPresent = false;
+	bool functionStartsPresent = false;
+	bool relocatable = false;
+
+	// The base address of the link edit file.
+	// Use this if you want to read offsets relative to the file containing the link edit segment.
+	uint64_t GetLinkEditFileBase() const { return linkeditSegment.vmaddr - linkeditSegment.fileoff; };
+
+	static std::optional<SharedCacheMachOHeader> ParseHeaderForAddress(
+		std::shared_ptr<VirtualMemory> vm, uint64_t address, const std::string& imagePath);
+
+	// TODO: Replace view with address size?
+	std::vector<CacheSymbol> ReadSymbolTable(BinaryNinja::BinaryView& view, VirtualMemory& vm) const;
+
+	std::optional<CacheSymbol> AddExportTerminalSymbol(
+		const std::string& symbolName, const uint8_t* current, const uint8_t* end) const;
+
+	bool ProcessLinkEditTrie(std::vector<CacheSymbol>& symbols, const std::string& currentText, const uint8_t* begin,
+		const uint8_t* current, const uint8_t* end) const;
+
+	std::vector<CacheSymbol> ReadExportSymbolTrie(VirtualMemory& vm) const;
+
+	std::vector<uint64_t> ReadFunctionTable(VirtualMemory& vm) const;
+};
-- 
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