core: kernel: Allow shared page on MapProcessMemoryEx (azahar-emu#2641)

Author: PabloMK7

src/core/hle/kernel/kernel.cpp

@@ -1,6 +1,6 @@
 // Copyright 2014-2026 Citra Emulator Project / Azahar Emulator Project
-// Licensed under GPLv2 or any later version
-// Refer to the misc/licenses/gplv2.txt file included.
+// Licensed under GPLv3 or any later version
+// Refer to the LICENSE.txt file included.
 
 #include <boost/serialization/shared_ptr.hpp>
 #include <boost/serialization/unordered_map.hpp>
@@ -139,10 +139,18 @@ const SharedPage::Handler& KernelSystem::GetSharedPageHandler() const {
     return *shared_page_handler;
 }
 
+MemoryRef KernelSystem::GetSharedPageMemoryRef(u64 offset) {
+    return MemoryRef(shared_page_handler, offset);
+}
+
 ConfigMem::Handler& KernelSystem::GetConfigMemHandler() {
     return *config_mem_handler;
 }
 
+MemoryRef KernelSystem::GetConfigMemMemoryRef(u64 offset) {
+    return MemoryRef{config_mem_handler, offset};
+}
+
 IPCDebugger::Recorder& KernelSystem::GetIPCRecorder() {
     return *ipc_recorder;
 }

src/core/hle/kernel/kernel.h

@@ -1,6 +1,6 @@
 // Copyright 2014-2026 Citra Emulator Project / Azahar Emulator Project
-// Licensed under GPLv2 or any later version
-// Refer to the misc/licenses/gplv2.txt file included.
+// Licensed under GPLv3 or any later version
+// Refer to the LICENSE.txt file included.
 
 // PPSSPP Project
 // Licensed under GPLv2 or any later version
@@ -339,8 +339,10 @@ class KernelSystem {
 
     SharedPage::Handler& GetSharedPageHandler();
     const SharedPage::Handler& GetSharedPageHandler() const;
+    MemoryRef GetSharedPageMemoryRef(u64 offset);
 
     ConfigMem::Handler& GetConfigMemHandler();
+    MemoryRef GetConfigMemMemoryRef(u64 offset);
 
     IPCDebugger::Recorder& GetIPCRecorder();
     const IPCDebugger::Recorder& GetIPCRecorder() const;

src/core/hle/kernel/svc.cpp

@@ -1,6 +1,6 @@
 // Copyright 2014-2026 Citra Emulator Project / Azahar Emulator Project
-// Licensed under GPLv2 or any later version
-// Refer to the misc/licenses/gplv2.txt file included.
+// Licensed under GPLv3 or any later version
+// Refer to the LICENSE.txt file included.
 
 #include <algorithm>
 #include <array>
@@ -36,6 +36,7 @@
 #include "core/hle/kernel/server_session.h"
 #include "core/hle/kernel/session.h"
 #include "core/hle/kernel/shared_memory.h"
+#include "core/hle/kernel/shared_page.h"
 #include "core/hle/kernel/svc.h"
 #include "core/hle/kernel/svc_wrapper.h"
 #include "core/hle/kernel/thread.h"
@@ -2109,7 +2110,7 @@ Result SVC::MapProcessMemoryEx(Handle dst_process_handle, u32 dst_address,
 
     // TODO(PabloMK7) Fix-up this svc.
 
-    // Only linear memory supported
+    // Only FCRAM and kernel shared pages supported
     auto vma = src_process->vm_manager.FindVMA(src_address);
     R_UNLESS(vma != src_process->vm_manager.vma_map.end() &&
                  vma->second.type == VMAType::BackingMemory,
@@ -2118,11 +2119,20 @@ Result SVC::MapProcessMemoryEx(Handle dst_process_handle, u32 dst_address,
     const u32 offset = src_address - vma->second.base;
     R_UNLESS(offset + size <= vma->second.size, ResultInvalidAddress);
 
-    auto vma_res = dst_process->vm_manager.MapBackingMemory(
-        dst_address,
-        memory.GetFCRAMRef(vma->second.backing_memory.GetPtr() + offset -
-                           kernel.memory.GetFCRAMPointer(0)),
-        size, map_as_private ? MemoryState::Private : MemoryState::Shared);
+    MemoryRef src_memory_ref;
+    // TODO(PabloMK7): This is hacky, make a proper fix
+    if (vma->second.backing_memory.GetPtr() == kernel.GetSharedPageHandler().GetPtr()) {
+        src_memory_ref = kernel.GetSharedPageMemoryRef(offset);
+    } else if (vma->second.backing_memory.GetPtr() == kernel.GetConfigMemHandler().GetPtr()) {
+        src_memory_ref = kernel.GetConfigMemMemoryRef(offset);
+    } else {
+        src_memory_ref = memory.GetFCRAMRef(vma->second.backing_memory.GetPtr() + offset -
+                                            kernel.memory.GetFCRAMPointer(0));
+    }
+
+    auto vma_res = dst_process->vm_manager.MapBackingMemory(dst_address, src_memory_ref, size,
+                                                            map_as_private ? MemoryState::Private
+                                                                           : MemoryState::Shared);
 
     if (!vma_res.Succeeded()) {
         return ResultInvalidAddressState;
@@ -2141,7 +2151,6 @@ Result SVC::UnmapProcessMemoryEx(Handle process, u32 dst_address, u32 size) {
         size = (size & ~0xFFF) + Memory::CITRA_PAGE_SIZE;
     }
 
-    // Only linear memory supported
     auto vma = dst_process->vm_manager.FindVMA(dst_address);
     R_UNLESS(vma != dst_process->vm_manager.vma_map.end() &&
                  vma->second.type == VMAType::BackingMemory,