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Merge pull request #2280 from lioncash/nso

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loader/nso: Minor refactoring
This commit is contained in:
bunnei 2019-03-23 13:46:09 -04:00 • committed by GitHub
commit 6af322a347
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 93 additions and 74 deletions
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103
src/core/loader/nso.cpp
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@ -21,36 +21,8 @@
#include "core/settings.h"
namespace Loader {
struct NsoSegmentHeader {
u32_le offset;
u32_le location;
u32_le size;
union {
u32_le alignment;
u32_le bss_size;
};
};
static_assert(sizeof(NsoSegmentHeader) == 0x10, "NsoSegmentHeader has incorrect size.");
struct NsoHeader {
u32_le magic;
u32_le version;
INSERT_PADDING_WORDS(1);
u8 flags;
std::array<NsoSegmentHeader, 3> segments; // Text, RoData, Data (in that order)
std::array<u8, 0x20> build_id;
std::array<u32_le, 3> segments_compressed_size;
bool IsSegmentCompressed(size_t segment_num) const {
ASSERT_MSG(segment_num < 3, "Invalid segment {}", segment_num);
return ((flags >> segment_num) & 1);
}
};
static_assert(sizeof(NsoHeader) == 0x6c, "NsoHeader has incorrect size.");
static_assert(std::is_trivially_copyable_v<NsoHeader>, "NsoHeader isn't trivially copyable.");
struct ModHeader {
namespace {
struct MODHeader {
u32_le magic;
u32_le dynamic_offset;
u32_le bss_start_offset;
@ -59,7 +31,32 @@ struct ModHeader {
u32_le eh_frame_hdr_end_offset;
u32_le module_offset; // Offset to runtime-generated module object. typically equal to .bss base
};
static_assert(sizeof(ModHeader) == 0x1c, "ModHeader has incorrect size.");
static_assert(sizeof(MODHeader) == 0x1c, "MODHeader has incorrect size.");
std::vector<u8> DecompressSegment(const std::vector<u8>& compressed_data,
const NSOSegmentHeader& header) {
std::vector<u8> uncompressed_data(header.size);
const int bytes_uncompressed =
LZ4_decompress_safe(reinterpret_cast<const char*>(compressed_data.data()),
reinterpret_cast<char*>(uncompressed_data.data()),
static_cast<int>(compressed_data.size()), header.size);
ASSERT_MSG(bytes_uncompressed == static_cast<int>(header.size) &&
bytes_uncompressed == static_cast<int>(uncompressed_data.size()),
"{} != {} != {}", bytes_uncompressed, header.size, uncompressed_data.size());
return uncompressed_data;
}
constexpr u32 PageAlignSize(u32 size) {
return (size + Memory::PAGE_MASK) & ~Memory::PAGE_MASK;
}
} // Anonymous namespace
bool NSOHeader::IsSegmentCompressed(size_t segment_num) const {
ASSERT_MSG(segment_num < 3, "Invalid segment {}", segment_num);
return ((flags >> segment_num) & 1) != 0;
}
AppLoader_NSO::AppLoader_NSO(FileSys::VirtualFile file) : AppLoader(std::move(file)) {}
@ -76,38 +73,22 @@ FileType AppLoader_NSO::IdentifyType(const FileSys::VirtualFile& file) {
return FileType::NSO;
}
static std::vector<u8> DecompressSegment(const std::vector<u8>& compressed_data,
const NsoSegmentHeader& header) {
std::vector<u8> uncompressed_data(header.size);
const int bytes_uncompressed =
LZ4_decompress_safe(reinterpret_cast<const char*>(compressed_data.data()),
reinterpret_cast<char*>(uncompressed_data.data()),
static_cast<int>(compressed_data.size()), header.size);
ASSERT_MSG(bytes_uncompressed == static_cast<int>(header.size) &&
bytes_uncompressed == static_cast<int>(uncompressed_data.size()),
"{} != {} != {}", bytes_uncompressed, header.size, uncompressed_data.size());
return uncompressed_data;
}
static constexpr u32 PageAlignSize(u32 size) {
return (size + Memory::PAGE_MASK) & ~Memory::PAGE_MASK;
}
std::optional<VAddr> AppLoader_NSO::LoadModule(Kernel::Process& process,
const FileSys::VfsFile& file, VAddr load_base,
bool should_pass_arguments,
std::optional<FileSys::PatchManager> pm) {
if (file.GetSize() < sizeof(NsoHeader))
if (file.GetSize() < sizeof(NSOHeader)) {
return {};
}
NsoHeader nso_header{};
if (sizeof(NsoHeader) != file.ReadObject(&nso_header))
NSOHeader nso_header{};
if (sizeof(NSOHeader) != file.ReadObject(&nso_header)) {
return {};
}
if (nso_header.magic != Common::MakeMagic('N', 'S', 'O', '0'))
if (nso_header.magic != Common::MakeMagic('N', 'S', 'O', '0')) {
return {};
}
// Build program image
Kernel::CodeSet codeset;
@ -143,10 +124,10 @@ std::optional<VAddr> AppLoader_NSO::LoadModule(Kernel::Process& process,
std::memcpy(&module_offset, program_image.data() + 4, sizeof(u32));
// Read MOD header
ModHeader mod_header{};
MODHeader mod_header{};
// Default .bss to size in segment header if MOD0 section doesn't exist
u32 bss_size{PageAlignSize(nso_header.segments[2].bss_size)};
std::memcpy(&mod_header, program_image.data() + module_offset, sizeof(ModHeader));
std::memcpy(&mod_header, program_image.data() + module_offset, sizeof(MODHeader));
const bool has_mod_header{mod_header.magic == Common::MakeMagic('M', 'O', 'D', '0')};
if (has_mod_header) {
// Resize program image to include .bss section and page align each section
@ -158,13 +139,15 @@ std::optional<VAddr> AppLoader_NSO::LoadModule(Kernel::Process& process,
// Apply patches if necessary
if (pm && (pm->HasNSOPatch(nso_header.build_id) || Settings::values.dump_nso)) {
std::vector<u8> pi_header(program_image.size() + 0x100);
std::memcpy(pi_header.data(), &nso_header, sizeof(NsoHeader));
std::memcpy(pi_header.data() + 0x100, program_image.data(), program_image.size());
std::vector<u8> pi_header(sizeof(NSOHeader) + program_image.size());
pi_header.insert(pi_header.begin(), reinterpret_cast<u8*>(&nso_header),
reinterpret_cast<u8*>(&nso_header) + sizeof(NSOHeader));
pi_header.insert(pi_header.begin() + sizeof(NSOHeader), program_image.begin(),
program_image.end());
pi_header = pm->PatchNSO(pi_header);
std::memcpy(program_image.data(), pi_header.data() + 0x100, program_image.size());
std::copy(pi_header.begin() + sizeof(NSOHeader), pi_header.end(), program_image.begin());
}
// Apply cheats if they exist and the program has a valid title ID