mirror of
https://github.com/elripalda/Porpoise-Dolphin-Emulator-for-PS5.git
synced 2026-10-06 09:00:12 +02:00
RubenandClaude Opus 5.5
16155f71dd
A native GameCube and Wii disc player for PS5, running Dolphin as a libretro core behind its own launcher: cover-flow library with GameTDB box art and back covers, game details, memory cards, per-game settings, an in-game menu, original menu music and sounds, and four languages. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0138sc4fmBoY1dTQw6T2iBvM
314 lines
12 KiB
C++
314 lines
12 KiB
C++
/*
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* ps5-native-app-boilerplate - ELF64 object and SDK stub reader.
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* Copyright (C) 2026 BlackBearReloaded
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* SPDX-License-Identifier: GPL-3.0-or-later
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*
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* Reads relocatable objects after LLVM has resolved archives and reads public
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* SDK shared stubs to discover symbol providers without a copied catalog.
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*/
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#include "elf_object.hpp"
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#include <algorithm>
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#include <fstream>
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#include <limits>
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#include <stdexcept>
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#include <string_view>
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namespace ps5::elf
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{
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namespace
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{
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void require(bool condition, const std::string &message)
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{
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if (!condition)
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throw std::runtime_error(message);
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}
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bool range(std::uint64_t offset, std::uint64_t size, std::uint64_t length)
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{
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return offset <= length && size <= length - offset;
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}
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std::uint16_t u16(std::span<const std::uint8_t> data, std::size_t at)
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{
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require(at + 2 <= data.size(), "ELF u16 read outside input");
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return static_cast<std::uint16_t>(data[at]) | static_cast<std::uint16_t>(data[at + 1]) << 8;
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}
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std::uint32_t u32(std::span<const std::uint8_t> data, std::size_t at)
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{
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require(at + 4 <= data.size(), "ELF u32 read outside input");
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std::uint32_t value = 0;
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for (std::size_t i = 0; i < 4; ++i)
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value |= static_cast<std::uint32_t>(data[at + i]) << (i * 8);
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return value;
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}
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std::uint64_t u64(std::span<const std::uint8_t> data, std::size_t at)
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{
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require(at + 8 <= data.size(), "ELF u64 read outside input");
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std::uint64_t value = 0;
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for (std::size_t i = 0; i < 8; ++i)
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value |= static_cast<std::uint64_t>(data[at + i]) << (i * 8);
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return value;
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}
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std::string string_at(std::span<const std::uint8_t> table, std::uint64_t at)
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{
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require(at < table.size() || (at == 0 && table.empty()), "ELF string offset outside table");
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const std::size_t first = static_cast<std::size_t>(at);
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std::size_t end = first;
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while (end < table.size() && table[end] != 0)
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++end;
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require(end < table.size(), "unterminated ELF string");
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return {reinterpret_cast<const char *>(table.data() + first), end - first};
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}
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struct RawSection
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{
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std::uint32_t name{};
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std::uint32_t type{};
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std::uint64_t flags{};
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std::uint64_t address{};
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std::uint64_t offset{};
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std::uint64_t size{};
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std::uint32_t link{};
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std::uint32_t info{};
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std::uint64_t alignment{};
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std::uint64_t entry_size{};
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};
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struct ParsedSections
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{
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std::vector<RawSection> raw;
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std::vector<std::string> names;
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};
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ParsedSections sections(std::span<const std::uint8_t> data)
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{
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require(data.size() >= 0x40 && u32(data, 0) == 0x464c457f, "input is not an ELF file");
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require(data[4] == 2 && data[5] == 1, "only little-endian ELF64 is supported");
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const std::uint64_t offset = u64(data, 0x28);
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const std::size_t entry_size = u16(data, 0x3a);
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const std::size_t count = u16(data, 0x3c);
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const std::size_t names_index = u16(data, 0x3e);
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require(entry_size == 0x40, "unexpected ELF64 section-header size");
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require(count != 0 && range(offset, count * entry_size, data.size()),
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"ELF section table overruns input");
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require(names_index < count, "ELF section-name table index is invalid");
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ParsedSections result;
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result.raw.reserve(count);
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for (std::size_t i = 0; i < count; ++i)
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{
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const std::size_t at = static_cast<std::size_t>(offset) + i * entry_size;
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result.raw.push_back({u32(data, at), u32(data, at + 4), u64(data, at + 8),
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u64(data, at + 16), u64(data, at + 24), u64(data, at + 32),
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u32(data, at + 40), u32(data, at + 44), u64(data, at + 48),
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u64(data, at + 56)});
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}
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const RawSection &names = result.raw[names_index];
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require(range(names.offset, names.size, data.size()), "ELF section-name table overruns input");
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const auto table =
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data.subspan(static_cast<std::size_t>(names.offset), static_cast<std::size_t>(names.size));
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result.names.reserve(count);
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for (const RawSection §ion : result.raw)
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result.names.push_back(string_at(table, section.name));
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return result;
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}
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std::span<const std::uint8_t> section_data(std::span<const std::uint8_t> data,
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const RawSection §ion)
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{
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if (section.type == kSectionNoBits)
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return {};
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require(range(section.offset, section.size, data.size()), "ELF section overruns input");
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return data.subspan(static_cast<std::size_t>(section.offset),
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static_cast<std::size_t>(section.size));
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}
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std::vector<Symbol> read_symbols(std::span<const std::uint8_t> data, const ParsedSections &parsed,
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std::size_t symbol_index)
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{
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const RawSection &symbols = parsed.raw[symbol_index];
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require(symbols.entry_size == 24 && symbols.link < parsed.raw.size(),
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"unsupported ELF symbol table");
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const auto bytes = section_data(data, symbols);
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const auto strings = section_data(data, parsed.raw[symbols.link]);
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std::vector<Symbol> result;
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result.reserve(bytes.size() / 24);
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for (std::size_t at = 0; at + 24 <= bytes.size(); at += 24)
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result.push_back({string_at(strings, u32(bytes, at)), bytes[at + 4], bytes[at + 5],
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u16(bytes, at + 6), u64(bytes, at + 8), u64(bytes, at + 16)});
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return result;
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}
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std::string normalized_soname(std::string name)
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{
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constexpr std::string_view suffix = ".sprx";
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if (name.ends_with(suffix))
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name.replace(name.size() - suffix.size(), suffix.size(), ".prx");
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return name;
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}
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std::string module_from_soname(std::string_view soname)
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{
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const std::size_t slash = soname.find_last_of("/\\");
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if (slash != std::string_view::npos)
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soname.remove_prefix(slash + 1);
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const std::size_t dot = soname.find('.');
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return std::string{soname.substr(0, dot)};
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}
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} // namespace
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Bytes read_file(const std::filesystem::path &path)
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{
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std::ifstream input(path, std::ios::binary | std::ios::ate);
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if (!input)
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throw std::runtime_error("cannot open input: " + path.string());
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const std::streamsize size = input.tellg();
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require(size >= 0, "cannot size input: " + path.string());
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Bytes data(static_cast<std::size_t>(size));
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input.seekg(0);
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input.read(reinterpret_cast<char *>(data.data()), size);
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if (!input)
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throw std::runtime_error("cannot read input: " + path.string());
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return data;
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}
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Object read_object(std::span<const std::uint8_t> data, std::string origin)
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{
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require(u16(data, 0x10) == 1, "link input is not a relocatable ELF: " + origin);
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const ParsedSections parsed = sections(data);
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Object object;
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object.origin = std::move(origin);
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object.sections.reserve(parsed.raw.size());
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for (std::size_t i = 0; i < parsed.raw.size(); ++i)
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{
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const RawSection &raw = parsed.raw[i];
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const auto bytes = section_data(data, raw);
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object.sections.push_back({parsed.names[i], raw.type, raw.flags, raw.address, raw.offset,
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raw.size, raw.link, raw.info,
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std::max<std::uint64_t>(raw.alignment, 1), raw.entry_size,
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Bytes{bytes.begin(), bytes.end()}});
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}
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std::size_t symbol_index = parsed.raw.size();
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for (std::size_t i = 0; i < parsed.raw.size(); ++i)
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if (parsed.raw[i].type == kSectionSymbolTable)
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{
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symbol_index = i;
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break;
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}
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require(symbol_index < parsed.raw.size(), "relocatable ELF has no symbol table");
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object.symbols = read_symbols(data, parsed, symbol_index);
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for (std::size_t i = 0; i < parsed.raw.size(); ++i)
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{
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const RawSection &raw = parsed.raw[i];
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if (raw.type != kSectionRela)
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continue;
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require(raw.entry_size == 24 && raw.link == symbol_index && raw.info < parsed.raw.size(),
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"unsupported ELF relocation section");
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const auto bytes = section_data(data, raw);
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auto &output = object.relocations[raw.info];
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output.reserve(bytes.size() / 24);
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for (std::size_t at = 0; at + 24 <= bytes.size(); at += 24)
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{
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const std::uint64_t info = u64(bytes, at + 8);
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output.push_back({u64(bytes, at), static_cast<std::uint32_t>(info >> 32),
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static_cast<std::uint32_t>(info),
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static_cast<std::int64_t>(u64(bytes, at + 16))});
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}
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}
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return object;
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}
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Image read_image(std::span<const std::uint8_t> data, std::string origin)
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{
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require(u16(data, 0x10) == 3, "link output is not an ELF shared image: " + origin);
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const ParsedSections parsed = sections(data);
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Image image;
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image.origin = std::move(origin);
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image.entry = u64(data, 0x18);
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image.sections.reserve(parsed.raw.size());
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for (std::size_t i = 0; i < parsed.raw.size(); ++i)
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{
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const RawSection &raw = parsed.raw[i];
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const auto bytes = section_data(data, raw);
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image.sections.push_back({parsed.names[i], raw.type, raw.flags, raw.address, raw.offset,
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raw.size, raw.link, raw.info,
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std::max<std::uint64_t>(raw.alignment, 1), raw.entry_size,
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Bytes{bytes.begin(), bytes.end()}});
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if (raw.type == kSectionDynamicSymbols)
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image.dynamic_symbols = read_symbols(data, parsed, i);
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}
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for (std::size_t i = 0; i < parsed.raw.size(); ++i)
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{
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const RawSection &dynamic = parsed.raw[i];
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if (dynamic.type != kSectionDynamic)
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continue;
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require(dynamic.link < parsed.raw.size() && dynamic.entry_size == 16,
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"linked ELF has an unsupported dynamic table");
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const auto entries = section_data(data, dynamic);
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const auto strings = section_data(data, parsed.raw[dynamic.link]);
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for (std::size_t at = 0; at + 16 <= entries.size(); at += 16)
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{
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const std::uint64_t tag = u64(entries, at);
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if (tag == 0)
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break;
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if (tag == 1)
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image.needed.push_back(normalized_soname(string_at(strings, u64(entries, at + 8))));
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}
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}
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require(!image.dynamic_symbols.empty(),
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"linked ELF has no dynamic symbol table: " + image.origin);
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return image;
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}
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Stub read_stub(std::span<const std::uint8_t> data, std::string origin)
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{
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const ParsedSections parsed = sections(data);
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std::size_t symbols_index = parsed.raw.size();
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std::size_t dynamic_index = parsed.raw.size();
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for (std::size_t i = 0; i < parsed.raw.size(); ++i)
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{
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if (parsed.raw[i].type == kSectionDynamicSymbols)
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symbols_index = i;
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if (parsed.raw[i].type == kSectionDynamic)
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dynamic_index = i;
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}
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require(symbols_index < parsed.raw.size() && dynamic_index < parsed.raw.size(),
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"SDK stub lacks dynamic metadata: " + origin);
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const auto symbols = read_symbols(data, parsed, symbols_index);
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const RawSection &dynamic = parsed.raw[dynamic_index];
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require(dynamic.link < parsed.raw.size() && dynamic.entry_size == 16,
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"SDK stub has unsupported dynamic table: " + origin);
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const auto strings = section_data(data, parsed.raw[dynamic.link]);
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const auto entries = section_data(data, dynamic);
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std::string soname;
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for (std::size_t at = 0; at + 16 <= entries.size(); at += 16)
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{
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const std::uint64_t tag = u64(entries, at);
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if (tag == 0)
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break;
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if (tag == 14)
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soname = string_at(strings, u64(entries, at + 8));
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}
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require(!soname.empty(), "SDK stub has no SONAME: " + origin);
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Stub stub;
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stub.soname = normalized_soname(std::move(soname));
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stub.module_name = module_from_soname(stub.soname);
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stub.library_name = stub.module_name;
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for (const Symbol &symbol : symbols)
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if (!symbol.undefined() && symbol.global_or_weak() && !symbol.name.empty())
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stub.exports.push_back(symbol.name);
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return stub;
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}
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} // namespace ps5::elf
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