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nso: Fixes to support homebrew NSOs without a MOD header.

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This commit is contained in:
bunnei 2017-10-03 18:30:02 -04:00
parent 6377585edb
commit d454364bca
2 changed files with 23 additions and 17 deletions
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38
src/core/loader/nso.cpp
View file

@ -190,14 +190,14 @@ void AppLoader_NSO::Relocate(VAddr load_base, VAddr dynamic_section_addr) {
} }
} }
VAddr AppLoader_NSO::GetEntryPoint() const { VAddr AppLoader_NSO::GetEntryPoint(VAddr load_base) const {
// Find nnMain function, set entrypoint to that address // Find nnMain function, set entrypoint to that address
const auto& search = exports.find("nnMain"); const auto& search = exports.find("nnMain");
if (search != exports.end()) { if (search != exports.end()) {
return search->second; return search->second;
} }
ASSERT_MSG(false, "Unable to find entrypoint"); LOG_ERROR(Loader, "Unable to find entrypoint, defaulting to: 0x%llx", load_base);
return {}; return load_base;
} }
static constexpr u32 PageAlignSize(u32 size) { static constexpr u32 PageAlignSize(u32 size) {
@ -230,29 +230,31 @@ bool AppLoader_NSO::LoadNso(const std::string& path, VAddr load_base) {
program_image.insert(program_image.end(), data.begin(), data.end()); program_image.insert(program_image.end(), data.begin(), data.end());
codeset->segments[i].addr = nso_header.segments[i].location; codeset->segments[i].addr = nso_header.segments[i].location;
codeset->segments[i].offset = nso_header.segments[i].location; codeset->segments[i].offset = nso_header.segments[i].location;
codeset->segments[i].size = static_cast<u32>(data.size()); codeset->segments[i].size = PageAlignSize(static_cast<u32>(data.size()));
} }
// Read MOD header // Read MOD header
ModHeader 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(), sizeof(ModHeader)); std::memcpy(&mod_header, program_image.data(), sizeof(ModHeader));
if (mod_header.magic != MakeMagic('M', 'O', 'D', '0')) { const bool has_mod_header{mod_header.magic == MakeMagic('M', 'O', 'D', '0')};
return {}; if (has_mod_header) {
}
// Resize program image to include .bss section and page align each section // Resize program image to include .bss section and page align each section
const u32 bss_size = mod_header.bss_end_offset - mod_header.bss_start_offset; bss_size = PageAlignSize(mod_header.bss_end_offset - mod_header.bss_start_offset);
codeset->code.size = PageAlignSize(codeset->code.size); codeset->data.size += bss_size;
codeset->rodata.size = PageAlignSize(codeset->rodata.size); }
codeset->data.size = PageAlignSize(codeset->data.size + bss_size);
program_image.resize(PageAlignSize(static_cast<u32>(program_image.size()) + bss_size)); program_image.resize(PageAlignSize(static_cast<u32>(program_image.size()) + bss_size));
// Load codeset for current process // Load codeset for current process
codeset->name = path; codeset->name = path;
codeset->memory = std::make_shared<std::vector<u8>>(std::move(program_image)); codeset->memory = std::make_shared<std::vector<u8>>(std::move(program_image));
Kernel::g_current_process->LoadModule(codeset, load_base); Kernel::g_current_process->LoadModule(codeset, load_base);
Relocate(load_base, load_base + mod_header.offset_to_start + mod_header.dynamic_offset);
// 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(load_base, load_base + mod_header.offset_to_start + mod_header.dynamic_offset);
}
return true; return true;
} }
@ -265,17 +267,21 @@ ResultStatus AppLoader_NSO::Load() {
} }
// Load and relocate "main" and "sdk" NSO // Load and relocate "main" and "sdk" NSO
const std::string sdkpath = filepath.substr(0, filepath.find_last_of("/\\")) + "/sdk"; static constexpr VAddr main_base{0x10000000};
Kernel::g_current_process = Kernel::Process::Create("main"); Kernel::g_current_process = Kernel::Process::Create("main");
if (!LoadNso(filepath, 0x10000000) || !LoadNso(sdkpath, 0x20000000)) { if (!LoadNso(filepath, main_base)) {
return ResultStatus::ErrorInvalidFormat; return ResultStatus::ErrorInvalidFormat;
} }
const std::string sdkpath = filepath.substr(0, filepath.find_last_of("/\\")) + "/sdk";
if (!LoadNso(sdkpath, 0x20000000)) {
LOG_WARNING(Loader, "failed to find SDK NSO");
}
Kernel::g_current_process->svc_access_mask.set(); Kernel::g_current_process->svc_access_mask.set();
Kernel::g_current_process->address_mappings = default_address_mappings; Kernel::g_current_process->address_mappings = default_address_mappings;
Kernel::g_current_process->resource_limit = Kernel::g_current_process->resource_limit =
Kernel::ResourceLimit::GetForCategory(Kernel::ResourceLimitCategory::APPLICATION); Kernel::ResourceLimit::GetForCategory(Kernel::ResourceLimitCategory::APPLICATION);
Kernel::g_current_process->Run(GetEntryPoint(), 48, Kernel::DEFAULT_STACK_SIZE); Kernel::g_current_process->Run(GetEntryPoint(main_base), 48, Kernel::DEFAULT_STACK_SIZE);
// Resolve imports // Resolve imports
for (const auto& import : imports) { for (const auto& import : imports) {

2
src/core/loader/nso.h
View file

@ -47,7 +47,7 @@ private:
void WriteRelocations(const std::vector<Symbol>& symbols, VAddr load_base, void WriteRelocations(const std::vector<Symbol>& symbols, VAddr load_base,
u64 relocation_offset, u64 size, bool is_jump_relocation); u64 relocation_offset, u64 size, bool is_jump_relocation);
VAddr GetEntryPoint() const; VAddr GetEntryPoint(VAddr load_base) const;
bool LoadNso(const std::string& path, VAddr load_base); bool LoadNso(const std::string& path, VAddr load_base);
void Relocate(VAddr load_base, VAddr dynamic_section_addr); void Relocate(VAddr load_base, VAddr dynamic_section_addr);