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// Copyright 2017 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <vector>
#include "common/common_funcs.h"
#include "common/logging/log.h"
#include "common/swap.h"
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/resource_limit.h"
#include "core/loader/nro.h"
#include "core/memory.h"
namespace Loader {
struct NroSegmentHeader {
u32_le offset;
u32_le size;
};
static_assert(sizeof(NroSegmentHeader) == 0x8, "NroSegmentHeader has incorrect size.");
struct NroHeader {
INSERT_PADDING_BYTES(0x4);
u32_le module_header_offset;
INSERT_PADDING_BYTES(0x8);
u32_le magic;
INSERT_PADDING_BYTES(0x4);
u32_le file_size;
INSERT_PADDING_BYTES(0x4);
std::array<NroSegmentHeader, 3> segments; // Text, RoData, Data (in that order)
u32_le bss_size;
INSERT_PADDING_BYTES(0x44);
};
static_assert(sizeof(NroHeader) == 0x80, "NroHeader has incorrect size.");
struct ModHeader {
u32_le magic;
u32_le dynamic_offset;
u32_le bss_start_offset;
u32_le bss_end_offset;
u32_le unwind_start_offset;
u32_le unwind_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.");
FileType AppLoader_NRO::IdentifyType(FileUtil::IOFile& file) {
// Read NSO header
NroHeader nro_header{};
file.Seek(0, SEEK_SET);
if (sizeof(NroHeader) != file.ReadBytes(&nro_header, sizeof(NroHeader))) {
return FileType::Error;
}
if (nro_header.magic == Common::MakeMagic('N', 'R', 'O', '0')) {
return FileType::NRO;
}
return FileType::Error;
}
static constexpr u32 PageAlignSize(u32 size) {
return (size + Memory::PAGE_MASK) & ~Memory::PAGE_MASK;
}
static std::vector<u8> ReadSegment(FileUtil::IOFile& file, const NroSegmentHeader& header) {
std::vector<u8> data;
data.resize(header.size);
file.Seek(header.offset + sizeof(NroHeader), SEEK_SET);
size_t bytes_read{file.ReadBytes(data.data(), header.size)};
if (header.size != PageAlignSize(static_cast<u32>(bytes_read))) {
LOG_CRITICAL(Loader, "Failed to read NRO segment bytes", header.size);
return {};
}
return data;
}
bool AppLoader_NRO::LoadNro(const std::string& path, VAddr load_base) {
FileUtil::IOFile file(path, "rb");
if (!file.IsOpen()) {
return {};
}
// Read NSO header
NroHeader nro_header{};
file.Seek(0, SEEK_SET);
if (sizeof(NroHeader) != file.ReadBytes(&nro_header, sizeof(NroHeader))) {
return {};
}
if (nro_header.magic != Common::MakeMagic('N', 'R', 'O', '0')) {
return {};
}
// Build program image
Kernel::SharedPtr<Kernel::CodeSet> codeset = Kernel::CodeSet::Create("", 0);
std::vector<u8> program_image;
program_image.resize(PageAlignSize(nro_header.file_size + nro_header.bss_size));
file.Seek(0, SEEK_SET);
file.ReadBytes(program_image.data(), nro_header.file_size);
for (int i = 0; i < nro_header.segments.size(); ++i) {
codeset->segments[i].addr = nro_header.segments[i].offset;
codeset->segments[i].offset = nro_header.segments[i].offset;
codeset->segments[i].size = PageAlignSize(nro_header.segments[i].size);
}
// Read MOD header
ModHeader mod_header{};
u32 bss_size{Memory::PAGE_SIZE}; // Default .bss to page size if MOD0 section doesn't exist
std::memcpy(&mod_header, program_image.data() + nro_header.module_header_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
bss_size = PageAlignSize(mod_header.bss_end_offset - mod_header.bss_start_offset);
codeset->data.size += bss_size;
}
program_image.resize(PageAlignSize(static_cast<u32>(program_image.size()) + bss_size));
// Relocate symbols if there was a proper MOD header - This must happen after the image has been
// loaded into memory
if (has_mod_header) {
Relocate(program_image, nro_header.module_header_offset + mod_header.dynamic_offset,
load_base);
}
// Load codeset for current process
codeset->name = path;
codeset->memory = std::make_shared<std::vector<u8>>(std::move(program_image));
Kernel::g_current_process->LoadModule(codeset, load_base);
return true;
}
ResultStatus AppLoader_NRO::Load(Kernel::SharedPtr<Kernel::Process>& process) {
if (is_loaded) {
return ResultStatus::ErrorAlreadyLoaded;
}
if (!file.IsOpen()) {
return ResultStatus::Error;
}
// Load and relocate "main" and "sdk" NSO
static constexpr VAddr base_addr{Memory::PROCESS_IMAGE_VADDR};
process = Kernel::Process::Create("main");
if (!LoadNro(filepath, base_addr)) {
return ResultStatus::ErrorInvalidFormat;
}
process->svc_access_mask.set();
process->address_mappings = default_address_mappings;
process->resource_limit =
Kernel::ResourceLimit::GetForCategory(Kernel::ResourceLimitCategory::APPLICATION);
process->Run(base_addr, 48, Kernel::DEFAULT_STACK_SIZE);
ResolveImports();
is_loaded = true;
return ResultStatus::Success;
}
} // namespace Loader
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