[nce] add split patch mode to support modules bigger than 128MB (#3489)

nce patcher was extended to support modules larger than 128MB due to ARM64 branch limit. now added a pre-patch and (existing) post-patch module code. Allowwing MRS/MSR/SVC handler to remain within branch branch range

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3489
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Co-authored-by: Maufeat <sahyno1996@gmail.com>
Co-committed-by: Maufeat <sahyno1996@gmail.com>

2 files changed, 22 insertions, 1 deletions

diff --git a/src/core/hle/kernel/code_set.h b/src/core/hle/kernel/code_set.h
index 4d2d0098e7..1416fc52b1 100644
--- a/src/core/hle/kernel/code_set.h
+++ b/src/core/hle/kernel/code_set.h
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2019 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -83,6 +86,14 @@ struct CodeSet final {
     const Segment& PatchSegment() const {
         return patch_segment;
     }
+
+    Segment& PostPatchSegment() {
+        return post_patch_segment;
+    }
+
+    const Segment& PostPatchSegment() const {
+        return post_patch_segment;
+    }
 #endif
 
     /// The overall data that backs this code set.
@@ -93,6 +104,7 @@ struct CodeSet final {
 
 #ifdef HAS_NCE
     Segment patch_segment;
+    Segment post_patch_segment;
 #endif
 
     /// The entry point address for this code set.
diff --git a/src/core/hle/kernel/k_process.cpp b/src/core/hle/kernel/k_process.cpp
index 082049f957..bd50f74c27 100644
--- a/src/core/hle/kernel/k_process.cpp
+++ b/src/core/hle/kernel/k_process.cpp
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
@@ -1258,6 +1258,7 @@ void KProcess::LoadModule(CodeSet code_set, KProcessAddress base_addr) {
 
 #ifdef HAS_NCE
     const auto& patch = code_set.PatchSegment();
+    const auto& post_patch = code_set.PostPatchSegment();
     if (this->IsApplication() && Settings::IsNceEnabled() && patch.size != 0) {
         auto& buffer = m_kernel.System().DeviceMemory().buffer;
         const auto& code = code_set.CodeSegment();
@@ -1265,7 +1266,15 @@ void KProcess::LoadModule(CodeSet code_set, KProcessAddress base_addr) {
                        Common::MemoryPermission::Read | Common::MemoryPermission::Execute);
         buffer.Protect(GetInteger(base_addr + patch.addr), patch.size,
                        Common::MemoryPermission::Read | Common::MemoryPermission::Execute);
+        // Protect post-patch segment if it exists like abve
+        if (post_patch.size != 0) {
+            buffer.Protect(GetInteger(base_addr + post_patch.addr), post_patch.size,
+                           Common::MemoryPermission::Read | Common::MemoryPermission::Execute);
+        }
         ReprotectSegment(code_set.PatchSegment(), Svc::MemoryPermission::None);
+        if (post_patch.size != 0) {
+            ReprotectSegment(code_set.PostPatchSegment(), Svc::MemoryPermission::None);
+        }
     }
 #endif
 }