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95 lines
4.3 KiB
C++
95 lines
4.3 KiB
C++
// SPDX-License-Identifier: MPL-2.0
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// Copyright © 2020 Skyline Team and Contributors (https://github.com/skyline-emu/)
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#pragma once
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#include "loader.h"
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namespace skyline::loader {
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/**
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* @brief The NsoLoader class abstracts access to an NSO file through the Loader interface
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* @url https://switchbrew.org/wiki/NSO
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*/
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class NsoLoader : public Loader {
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private:
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std::shared_ptr<vfs::Backing> backing;
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union NsoFlags {
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struct {
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bool textCompressed : 1; //!< .text is compressed
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bool roCompressed : 1; //!< .rodata is compressed
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bool dataCompressed : 1; //!< .data is compressed
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bool textHash : 1; //!< .text hash should be checked before loading
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bool roHash : 1; //!< .rodata hash should be checked before loading
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bool dataHash : 1; //!< .data hash should be checked before loading
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};
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u32 raw;
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};
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static_assert(sizeof(NsoFlags) == 0x4);
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struct NsoSegmentHeader {
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u32 fileOffset; //!< The offset of the segment in the NSO
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u32 memoryOffset; //!< The memory offset where the region should be loaded
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u32 decompressedSize; //!< Size of the region after decompression
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};
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static_assert(sizeof(NsoSegmentHeader) == 0xC);
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struct NsoRelativeSegmentHeader {
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u32 offset; //!< The offset of the segment into it's parent segment
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u32 size; //!< Size of the segment
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};
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static_assert(sizeof(NsoRelativeSegmentHeader) == 0x8);
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struct NsoHeader {
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u32 magic; //!< The NSO magic "NSO0"
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u32 version; //!< The version of the application
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u32 _pad0_;
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NsoFlags flags; //!< The flags used with the NSO
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NsoSegmentHeader text; //!< The .text segment header
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u32 modOffset; //!< The offset of the MOD metadata
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NsoSegmentHeader ro; //!< The .rodata segment header
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u32 modSize; //!< The size of the MOD metadata
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NsoSegmentHeader data; //!< The .data segment header
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u32 bssSize; //!< The size of the .bss segment
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std::array<u64, 4> buildId; //!< The build ID of the NSO
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u32 textCompressedSize; //!< The size of the compressed .text segment
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u32 roCompressedSize; //!< The size of the compressed .rodata segment
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u32 dataCompressedSize; //!< The size of the compressed .data segment
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u32 _pad1_[7];
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NsoRelativeSegmentHeader apiInfo; //!< The .rodata-relative segment .apiInfo
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NsoRelativeSegmentHeader dynstr; //!< The .rodata-relative segment .dynstr
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NsoRelativeSegmentHeader dynsym; //!< The .rodata-relative segment .dynsym
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std::array<std::array<u64, 4>, 3> segmentHashes; //!< The SHA256 checksums of the .text, .rodata and .data segments
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};
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static_assert(sizeof(NsoHeader) == 0x100);
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/**
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* @brief Reads the specified segment from the backing and decompresses it if needed
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* @param segment The header of the segment to read
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* @param compressedSize The compressed size of the segment, 0 if the segment is not compressed
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* @return A buffer containing the data of the requested segment
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*/
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static std::vector<u8> GetSegment(const std::shared_ptr<vfs::Backing> &backing, const NsoSegmentHeader &segment, u32 compressedSize);
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public:
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NsoLoader(const std::shared_ptr<vfs::Backing> &backing);
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/**
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* @brief Loads an NSO into memory, offset by the given amount
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* @param backing The backing that the NSO is contained within
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* @param offset The offset from the base address to place the NSO
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* @param name An optional name for the NSO, used for symbol resolution
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* @return An ExecutableLoadInfo struct containing the load base and size
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*/
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static ExecutableLoadInfo LoadNso(Loader *loader, const std::shared_ptr<vfs::Backing> &backing, const std::shared_ptr<kernel::type::KProcess> process, const DeviceState &state, size_t offset = 0, const std::string &name = {});
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void *LoadProcessData(const std::shared_ptr<kernel::type::KProcess> process, const DeviceState &state);
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};
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}
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