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-rw-r--r--src/core/arm/nce/patch.h107
1 files changed, 107 insertions, 0 deletions
diff --git a/src/core/arm/nce/patch.h b/src/core/arm/nce/patch.h
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+++ b/src/core/arm/nce/patch.h
@@ -0,0 +1,107 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <span>
+#include <unordered_map>
+#include <vector>
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wshorten-64-to-32"
+#include <oaknut/code_block.hpp>
+#include <oaknut/oaknut.hpp>
+#pragma clang diagnostic pop
+
+#include "common/common_types.h"
+#include "core/hle/kernel/code_set.h"
+#include "core/hle/kernel/k_typed_address.h"
+#include "core/hle/kernel/physical_memory.h"
+
+#include <signal.h>
+
+namespace Core {
+struct GuestContext;
+}
+
+namespace Core::NCE {
+
+enum class PatchMode : u32 {
+ None,
+ PreText, ///< Patch section is inserted before .text
+ PostData, ///< Patch section is inserted after .data
+};
+
+using ModuleTextAddress = u64;
+using PatchTextAddress = u64;
+using EntryTrampolines = std::unordered_map<ModuleTextAddress, PatchTextAddress>;
+
+class Patcher {
+public:
+ explicit Patcher();
+ ~Patcher();
+
+ void PatchText(const Kernel::PhysicalMemory& program_image,
+ const Kernel::CodeSet::Segment& code);
+ void RelocateAndCopy(Common::ProcessAddress load_base, const Kernel::CodeSet::Segment& code,
+ Kernel::PhysicalMemory& program_image, EntryTrampolines* out_trampolines);
+ size_t SectionSize() const noexcept;
+
+ [[nodiscard]] PatchMode Mode() const noexcept {
+ return mode;
+ }
+
+private:
+ using ModuleDestLabel = uintptr_t;
+
+ struct Trampoline {
+ ptrdiff_t patch_offset;
+ uintptr_t module_offset;
+ };
+
+ void WriteLoadContext();
+ void WriteSaveContext();
+ void LockContext();
+ void UnlockContext();
+ void WriteSvcTrampoline(ModuleDestLabel module_dest, u32 svc_id);
+ void WriteMrsHandler(ModuleDestLabel module_dest, oaknut::XReg dest_reg,
+ oaknut::SystemReg src_reg);
+ void WriteMsrHandler(ModuleDestLabel module_dest, oaknut::XReg src_reg);
+ void WriteCntpctHandler(ModuleDestLabel module_dest, oaknut::XReg dest_reg);
+
+private:
+ void BranchToPatch(uintptr_t module_dest) {
+ 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});
+ c.dw(0);
+ }
+
+ void WriteModulePc(uintptr_t module_dest) {
+ m_write_module_pc_relocations.push_back({c.offset(), module_dest});
+ c.dx(0);
+ }
+
+private:
+ // List of patch instructions we have generated.
+ std::vector<u32> m_patch_instructions{};
+
+ // Relocation type for relative branch from module to patch.
+ struct Relocation {
+ ptrdiff_t patch_offset; ///< Offset in bytes from the start of the patch section.
+ uintptr_t module_offset; ///< Offset in bytes from the start of the text section.
+ };
+
+ oaknut::VectorCodeGenerator c;
+ 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{};
+ oaknut::Label m_save_context{};
+ oaknut::Label m_load_context{};
+ PatchMode mode{PatchMode::None};
+};
+
+} // namespace Core::NCE