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core: Support multiple modules per patcher

This commit is contained in:
GPUCode 2024-01-03 23:37:41 +02:00
parent 817c7c445d
commit d4acdac168
6 changed files with 154 additions and 79 deletions
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69
src/core/arm/nce/patcher.cpp
View File

@ -22,14 +22,10 @@ using NativeExecutionParameters = Kernel::KThread::NativeExecutionParameters;
constexpr size_t MaxRelativeBranch = 128_MiB;
constexpr u32 ModuleCodeIndex = 0x24 / sizeof(u32);
Patcher::Patcher() : c(m_patch_instructions) {}
Patcher::~Patcher() = default;
void Patcher::PatchText(const Kernel::PhysicalMemory& program_image,
const Kernel::CodeSet::Segment& code) {
// Branch to the first instruction of the module.
this->BranchToModule(0);
Patcher::Patcher() : c(m_patch_instructions) {
// The first word of the patch section is always a branch to the first instruction of the
// module.
c.dw(0);
// Write save context helper function.
c.l(m_save_context);
@ -38,6 +34,25 @@ void Patcher::PatchText(const Kernel::PhysicalMemory& program_image,
// Write load context helper function.
c.l(m_load_context);
WriteLoadContext();
}
Patcher::~Patcher() = default;
bool Patcher::PatchText(const Kernel::PhysicalMemory& program_image,
const Kernel::CodeSet::Segment& code) {
// If we have patched modules but cannot reach the new module, then it needs its own patcher.
const size_t image_size = program_image.size();
if (total_program_size + image_size > MaxRelativeBranch && total_program_size > 0) {
return false;
}
// Add a new module patch to our list
modules.emplace_back();
curr_patch = &modules.back();
// The first word of the patch section is always a branch to the first instruction of the
// module.
curr_patch->m_branch_to_module_relocations.push_back({0, 0});
// Retrieve text segment data.
const auto text = std::span{program_image}.subspan(code.offset, code.size);
@ -94,16 +109,17 @@ void Patcher::PatchText(const Kernel::PhysicalMemory& program_image,
}
if (auto exclusive = Exclusive{inst}; exclusive.Verify()) {
m_exclusives.push_back(i);
curr_patch->m_exclusives.push_back(i);
}
}
// Determine patching mode for the final relocation step
const size_t image_size = program_image.size();
total_program_size += image_size;
this->mode = image_size > MaxRelativeBranch ? PatchMode::PreText : PatchMode::PostData;
return true;
}
void Patcher::RelocateAndCopy(Common::ProcessAddress load_base,
bool Patcher::RelocateAndCopy(Common::ProcessAddress load_base,
const Kernel::CodeSet::Segment& code,
Kernel::PhysicalMemory& program_image,
EntryTrampolines* out_trampolines) {
@ -120,7 +136,7 @@ void Patcher::RelocateAndCopy(Common::ProcessAddress load_base,
if (mode == PatchMode::PreText) {
rc.B(rel.patch_offset - patch_size - rel.module_offset);
} else {
rc.B(image_size - rel.module_offset + rel.patch_offset);
rc.B(total_program_size - rel.module_offset + rel.patch_offset);
}
};
@ -129,7 +145,7 @@ void Patcher::RelocateAndCopy(Common::ProcessAddress load_base,
if (mode == PatchMode::PreText) {
rc.B(patch_size - rel.patch_offset + rel.module_offset);
} else {
rc.B(rel.module_offset - image_size - rel.patch_offset);
rc.B(rel.module_offset - total_program_size - rel.patch_offset);
}
};
@ -137,7 +153,7 @@ void Patcher::RelocateAndCopy(Common::ProcessAddress load_base,
if (mode == PatchMode::PreText) {
return GetInteger(load_base) + patch_offset;
} else {
return GetInteger(load_base) + image_size + patch_offset;
return GetInteger(load_base) + total_program_size + patch_offset;
}
};
@ -150,32 +166,39 @@ void Patcher::RelocateAndCopy(Common::ProcessAddress load_base,
};
// We are now ready to relocate!
for (const Relocation& rel : m_branch_to_patch_relocations) {
auto& patch = modules[m_relocate_module_index++];
for (const Relocation& rel : patch.m_branch_to_patch_relocations) {
ApplyBranchToPatchRelocation(text_words.data() + rel.module_offset / sizeof(u32), rel);
}
for (const Relocation& rel : m_branch_to_module_relocations) {
for (const Relocation& rel : patch.m_branch_to_module_relocations) {
ApplyBranchToModuleRelocation(m_patch_instructions.data() + rel.patch_offset / sizeof(u32),
rel);
}
// Rewrite PC constants and record post trampolines
for (const Relocation& rel : m_write_module_pc_relocations) {
for (const Relocation& rel : patch.m_write_module_pc_relocations) {
oaknut::CodeGenerator rc{m_patch_instructions.data() + rel.patch_offset / sizeof(u32)};
rc.dx(RebasePc(rel.module_offset));
}
for (const Trampoline& rel : m_trampolines) {
for (const Trampoline& rel : patch.m_trampolines) {
out_trampolines->insert({RebasePc(rel.module_offset), RebasePatch(rel.patch_offset)});
}
// Cortex-A57 seems to treat all exclusives as ordered, but newer processors do not.
// Convert to ordered to preserve this assumption.
for (const ModuleTextAddress i : m_exclusives) {
for (const ModuleTextAddress i : patch.m_exclusives) {
auto exclusive = Exclusive{text_words[i]};
text_words[i] = exclusive.AsOrdered();
}
// Copy to program image
// Remove the patched module size from the total. This is done so total_program_size
// always represents the distance from the currently patched module to the patch section.
total_program_size -= image_size;
// Only copy to the program image of the last module
if (m_relocate_module_index == modules.size()) {
if (this->mode == PatchMode::PreText) {
ASSERT(image_size == total_program_size);
std::memcpy(program_image.data(), m_patch_instructions.data(),
m_patch_instructions.size() * sizeof(u32));
} else {
@ -183,6 +206,10 @@ void Patcher::RelocateAndCopy(Common::ProcessAddress load_base,
std::memcpy(program_image.data() + image_size, m_patch_instructions.data(),
m_patch_instructions.size() * sizeof(u32));
}
return true;
}
return false;
}
size_t Patcher::GetSectionSize() const noexcept {
@ -322,7 +349,7 @@ void Patcher::WriteSvcTrampoline(ModuleDestLabel module_dest, u32 svc_id) {
// Write the post-SVC trampoline address, which will jump back to the guest after restoring its
// state.
m_trampolines.push_back({c.offset(), module_dest});
curr_patch->m_trampolines.push_back({c.offset(), module_dest});
// Host called this location. Save the return address so we can
// unwind the stack properly when jumping back.

19
src/core/arm/nce/patcher.h
View File

@ -31,9 +31,9 @@ public:
explicit Patcher();
~Patcher();
void PatchText(const Kernel::PhysicalMemory& program_image,
bool PatchText(const Kernel::PhysicalMemory& program_image,
const Kernel::CodeSet::Segment& code);
void RelocateAndCopy(Common::ProcessAddress load_base, const Kernel::CodeSet::Segment& code,
bool RelocateAndCopy(Common::ProcessAddress load_base, const Kernel::CodeSet::Segment& code,
Kernel::PhysicalMemory& program_image, EntryTrampolines* out_trampolines);
size_t GetSectionSize() const noexcept;
@ -61,16 +61,16 @@ private:
private:
void BranchToPatch(uintptr_t module_dest) {
m_branch_to_patch_relocations.push_back({c.offset(), module_dest});
curr_patch->m_branch_to_patch_relocations.push_back({c.offset(), module_dest});
}
void BranchToModule(uintptr_t module_dest) {
m_branch_to_module_relocations.push_back({c.offset(), module_dest});
curr_patch->m_branch_to_module_relocations.push_back({c.offset(), module_dest});
c.dw(0);
}
void WriteModulePc(uintptr_t module_dest) {
m_write_module_pc_relocations.push_back({c.offset(), module_dest});
curr_patch->m_write_module_pc_relocations.push_back({c.offset(), module_dest});
c.dx(0);
}
@ -84,15 +84,22 @@ private:
uintptr_t module_offset; ///< Offset in bytes from the start of the text section.
};
oaknut::VectorCodeGenerator c;
struct ModulePatch {
std::vector<Trampoline> m_trampolines;
std::vector<Relocation> m_branch_to_patch_relocations{};
std::vector<Relocation> m_branch_to_module_relocations{};
std::vector<Relocation> m_write_module_pc_relocations{};
std::vector<ModuleTextAddress> m_exclusives{};
};
oaknut::VectorCodeGenerator c;
oaknut::Label m_save_context{};
oaknut::Label m_load_context{};
PatchMode mode{PatchMode::None};
size_t total_program_size{};
size_t m_relocate_module_index{};
std::vector<ModulePatch> modules;
ModulePatch* curr_patch;
};
} // namespace Core::NCE

4
src/core/hle/kernel/k_process.cpp
View File

@ -1233,10 +1233,10 @@ void KProcess::LoadModule(CodeSet code_set, KProcessAddress base_addr) {
ReprotectSegment(code_set.DataSegment(), Svc::MemoryPermission::ReadWrite);
#ifdef HAS_NCE
if (this->IsApplication() && Settings::IsNceEnabled()) {
const auto& patch = code_set.PatchSegment();
if (this->IsApplication() && Settings::IsNceEnabled() && patch.size != 0) {
auto& buffer = m_kernel.System().DeviceMemory().buffer;
const auto& code = code_set.CodeSegment();
const auto& patch = code_set.PatchSegment();
buffer.Protect(GetInteger(base_addr + code.addr), code.size,
Common::MemoryPermission::Read | Common::MemoryPermission::Execute);
buffer.Protect(GetInteger(base_addr + patch.addr), patch.size,

75
src/core/loader/deconstructed_rom_directory.cpp
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@ -19,8 +19,54 @@
#include "core/arm/nce/patcher.h"
#endif
#ifndef HAS_NCE
namespace Core::NCE {
class Patcher {};
} // namespace Core::NCE
#endif
namespace Loader {
struct PatchCollection {
explicit PatchCollection(bool is_application_) : is_application{is_application_} {
module_patcher_indices.fill(-1);
patchers.emplace_back();
}
std::vector<Core::NCE::Patcher>* GetPatchers() {
if (is_application && Settings::IsNceEnabled()) {
return &patchers;
}
return nullptr;
}
size_t GetTotalPatchSize() const {
size_t total_size{};
#ifdef HAS_NCE
for (auto& patcher : patchers) {
total_size += patcher.GetSectionSize();
}
#endif
return total_size;
}
void SaveIndex(size_t module) {
module_patcher_indices[module] = static_cast<s32>(patchers.size() - 1);
}
s32 GetIndex(size_t module) const {
return module_patcher_indices[module];
}
s32 GetLastIndex() const {
return static_cast<s32>(patchers.size()) - 1;
}
bool is_application;
std::vector<Core::NCE::Patcher> patchers;
std::array<s32, 13> module_patcher_indices{};
};
AppLoader_DeconstructedRomDirectory::AppLoader_DeconstructedRomDirectory(FileSys::VirtualFile file_,
bool override_update_)
: AppLoader(std::move(file_)), override_update(override_update_), is_hbl(false) {
@ -142,18 +188,7 @@ AppLoader_DeconstructedRomDirectory::LoadResult AppLoader_DeconstructedRomDirect
std::size_t code_size{};
// Define an nce patch context for each potential module.
#ifdef HAS_NCE
std::array<Core::NCE::Patcher, 13> module_patchers;
#endif
const auto GetPatcher = [&](size_t i) -> Core::NCE::Patcher* {
#ifdef HAS_NCE
if (is_application && Settings::IsNceEnabled()) {
return &module_patchers[i];
}
#endif
return nullptr;
};
PatchCollection patch_ctx{is_application};
// Use the NSO module loader to figure out the code layout
for (size_t i = 0; i < static_modules.size(); i++) {
@ -164,13 +199,14 @@ AppLoader_DeconstructedRomDirectory::LoadResult AppLoader_DeconstructedRomDirect
}
const bool should_pass_arguments = std::strcmp(module, "rtld") == 0;
const auto tentative_next_load_addr =
AppLoader_NSO::LoadModule(process, system, *module_file, code_size,
should_pass_arguments, false, {}, GetPatcher(i));
const auto tentative_next_load_addr = AppLoader_NSO::LoadModule(
process, system, *module_file, code_size, should_pass_arguments, false, {},
patch_ctx.GetPatchers(), patch_ctx.GetLastIndex());
if (!tentative_next_load_addr) {
return {ResultStatus::ErrorLoadingNSO, {}};
}
patch_ctx.SaveIndex(i);
code_size = *tentative_next_load_addr;
}
@ -184,6 +220,9 @@ AppLoader_DeconstructedRomDirectory::LoadResult AppLoader_DeconstructedRomDirect
return 0;
}();
// Add patch size to the total module size
code_size += patch_ctx.GetTotalPatchSize();
// Setup the process code layout
if (process.LoadFromMetadata(metadata, code_size, fastmem_base, is_hbl).IsError()) {
return {ResultStatus::ErrorUnableToParseKernelMetadata, {}};
@ -204,9 +243,9 @@ AppLoader_DeconstructedRomDirectory::LoadResult AppLoader_DeconstructedRomDirect
const VAddr load_addr{next_load_addr};
const bool should_pass_arguments = std::strcmp(module, "rtld") == 0;
const auto tentative_next_load_addr =
AppLoader_NSO::LoadModule(process, system, *module_file, load_addr,
should_pass_arguments, true, pm, GetPatcher(i));
const auto tentative_next_load_addr = AppLoader_NSO::LoadModule(
process, system, *module_file, load_addr, should_pass_arguments, true, pm,
patch_ctx.GetPatchers(), patch_ctx.GetIndex(i));
if (!tentative_next_load_addr) {
return {ResultStatus::ErrorLoadingNSO, {}};
}

29
src/core/loader/nso.cpp
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@ -77,7 +77,8 @@ std::optional<VAddr> AppLoader_NSO::LoadModule(Kernel::KProcess& process, Core::
const FileSys::VfsFile& nso_file, VAddr load_base,
bool should_pass_arguments, bool load_into_process,
std::optional<FileSys::PatchManager> pm,
Core::NCE::Patcher* patch) {
std::vector<Core::NCE::Patcher>* patches,
s32 patch_index) {
if (nso_file.GetSize() < sizeof(NSOHeader)) {
return std::nullopt;
}
@ -94,9 +95,12 @@ std::optional<VAddr> AppLoader_NSO::LoadModule(Kernel::KProcess& process, Core::
// Allocate some space at the beginning if we are patching in PreText mode.
const size_t module_start = [&]() -> size_t {
#ifdef HAS_NCE
if (patch && patch->GetPatchMode() == Core::NCE::PatchMode::PreText) {
if (patches && load_into_process) {
auto* patch = &patches->operator[](patch_index);
if (patch->GetPatchMode() == Core::NCE::PatchMode::PreText) {
return patch->GetSectionSize();
}
}
#endif
return 0;
}();
@ -160,27 +164,24 @@ std::optional<VAddr> AppLoader_NSO::LoadModule(Kernel::KProcess& process, Core::
#ifdef HAS_NCE
// If we are computing the process code layout and using nce backend, patch.
const auto& code = codeset.CodeSegment();
if (patch && patch->GetPatchMode() == Core::NCE::PatchMode::None) {
auto* patch = patches ? &patches->operator[](patch_index) : nullptr;
if (patch && !load_into_process) {
// Patch SVCs and MRS calls in the guest code
patch->PatchText(program_image, code);
// Add patch section size to the module size.
image_size += static_cast<u32>(patch->GetSectionSize());
while (!patch->PatchText(program_image, code)) {
patch = &patches->emplace_back();
}
} else if (patch) {
// Relocate code patch and copy to the program_image.
patch->RelocateAndCopy(load_base, code, program_image, &process.GetPostHandlers());
if (patch->RelocateAndCopy(load_base, code, program_image, &process.GetPostHandlers())) {
// Update patch section.
auto& patch_segment = codeset.PatchSegment();
patch_segment.addr =
patch->GetPatchMode() == Core::NCE::PatchMode::PreText ? 0 : image_size;
patch_segment.size = static_cast<u32>(patch->GetSectionSize());
// Add patch section size to the module size. In PreText mode image_size
// already contains the patch segment as part of module_start.
if (patch->GetPatchMode() == Core::NCE::PatchMode::PostData) {
image_size += patch_segment.size;
}
// Refresh image_size to take account the patch section if it was added by RelocateAndCopy
image_size = static_cast<u32>(program_image.size());
}
#endif

3
src/core/loader/nso.h
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@ -93,7 +93,8 @@ public:
const FileSys::VfsFile& nso_file, VAddr load_base,
bool should_pass_arguments, bool load_into_process,
std::optional<FileSys::PatchManager> pm = {},
Core::NCE::Patcher* patch = nullptr);
std::vector<Core::NCE::Patcher>* patches = nullptr,
s32 patch_index = -1);
LoadResult Load(Kernel::KProcess& process, Core::System& system) override;