97 lines
2.8 KiB
C++
97 lines
2.8 KiB
C++
//---------------------------------------------------------------------------//
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// 1100101 |_ mov #0, r4 __ //
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// 11 |_ <0xb380 %5c4> / _|_ _____ ___ //
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// 0110 |_ 3.50 -> 3.60 | _\ \ / _ (_-< //
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// |_ base# + offset |_| /_\_\___/__/ //
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//---------------------------------------------------------------------------//
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// fxos/symbols: User-extensible naming scheme for OS objects
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//
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// This header provides tools to define symbols, ie. names attached to fixed or
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// symbolic addresses. Currently supported:
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// - Address: the name maps to a fixed 32-bit virtual address.
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// - Syscall: the name maps to a syscall number resolved by OS analysis.
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//
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// The SymbolTable structure manages a set of symbols, usually all the symbols
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// in a given virtual space.
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//---
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#ifndef FXOS_SYMBOLS_H
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#define FXOS_SYMBOLS_H
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#include <optional>
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#include <string>
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#include <vector>
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#include <cstdint>
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namespace FxOS {
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/* A named symbol that can be substituted to literal values in the code. */
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struct Symbol
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{
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enum Type { Syscall = 1, Address = 2 };
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enum Type type;
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uint32_t value;
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/* Symbol name, no particular conventions */
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std::string name;
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bool operator<(const FxOS::Symbol &right) const
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{
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return (type < right.type)
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|| (value < right.value && type == right.type);
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}
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bool operator>(const FxOS::Symbol &right) const
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{
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return (type > right.type)
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|| (value > right.value && type == right.type);
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}
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bool operator==(const FxOS::Symbol &right) const
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{
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return value == right.value && type == right.type;
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}
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bool operator!=(const FxOS::Symbol &right) const
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{
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return value != right.value || type != right.type;
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}
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bool operator>=(const FxOS::Symbol &right) const
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{
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return (type > right.type)
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|| (value >= right.value && type == right.type);
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}
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bool operator<=(const FxOS::Symbol &right) const
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{
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return (type < right.type)
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|| (value <= right.value && type == right.type);
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}
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};
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/* A symbol table, usually the set of symbols of a virtual space */
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struct SymbolTable
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{
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SymbolTable();
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/* Allow move but disable copy */
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SymbolTable(SymbolTable const &other) = delete;
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SymbolTable(SymbolTable &&other) = default;
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std::string table_name;
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std::vector<Symbol> symbols;
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/* Add a symbol to the table */
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void add(Symbol s);
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/* Query a value for a certain type of symbol */
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std::optional<std::string> query(Symbol::Type type, uint32_t value) const;
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/* Lookup the symbol behind a given name */
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std::optional<Symbol> lookup(std::string name) const;
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};
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} /* namespace FxOS */
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#endif /* FXOS_SYMBOLS_H */
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