kern: add KCodeMemory code left out of previous commit

libraries/libmesosphere/source/kern_k_code_memory.cpp

@@ -0,0 +1,163 @@
+/*
+ * Copyright (c) 2018-2020 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <mesosphere.hpp>
+
+namespace ams::kern {
+
+    Result KCodeMemory::Initialize(KProcessAddress addr, size_t size) {
+        MESOSPHERE_ASSERT_THIS();
+
+        /* Set members. */
+        this->owner = GetCurrentProcessPointer();
+
+        /* Initialize the page group. */
+        auto &page_table = this->owner->GetPageTable();
+        new (GetPointer(this->page_group)) KPageGroup(page_table.GetBlockInfoManager());
+
+        /* Ensure that our page group's state is valid on exit. */
+        auto pg_guard = SCOPE_GUARD { GetReference(this->page_group).~KPageGroup(); };
+
+        /* Lock the memory. */
+        R_TRY(page_table.LockForCodeMemory(GetPointer(this->page_group), addr, size));
+
+        /* Clear the memory. */
+        for (const auto &block : GetReference(this->page_group)) {
+            /* Clear and store cache. */
+            std::memset(GetVoidPointer(block.GetAddress()), 0xFF, block.GetSize());
+            cpu::StoreDataCache(GetVoidPointer(block.GetAddress()), block.GetSize());
+        }
+
+        /* Set remaining tracking members. */
+        this->owner->Open();
+        this->address         = addr;
+        this->is_initialized  = true;
+        this->is_owner_mapped = false;
+        this->is_mapped       = false;
+
+        /* We succeeded. */
+        pg_guard.Cancel();
+        return ResultSuccess();
+    }
+
+    void KCodeMemory::Finalize() {
+        MESOSPHERE_ASSERT_THIS();
+
+        /* Unlock. */
+        if (!this->is_mapped && !this->is_owner_mapped) {
+            const size_t size = GetReference(this->page_group).GetNumPages() * PageSize;
+            MESOSPHERE_R_ABORT_UNLESS(this->owner->GetPageTable().UnlockForCodeMemory(this->address, size, GetReference(this->page_group)));
+        }
+
+        /* Close the page group. */
+        GetReference(this->page_group).Close();
+        GetReference(this->page_group).Finalize();
+
+        /* Close our reference to our owner. */
+        this->owner->Close();
+
+        /* Perform inherited finalization. */
+        KAutoObjectWithSlabHeapAndContainer<KCodeMemory, KAutoObjectWithList>::Finalize();
+    }
+
+    Result KCodeMemory::Map(KProcessAddress address, size_t size) {
+        MESOSPHERE_ASSERT_THIS();
+
+        /* Validate the size. */
+        R_UNLESS(GetReference(this->page_group).GetNumPages() == util::DivideUp(size, PageSize), svc::ResultInvalidSize());
+
+        /* Lock ourselves. */
+        KScopedLightLock lk(this->lock);
+
+        /* Ensure we're not already mapped. */
+        R_UNLESS(!this->is_mapped, svc::ResultInvalidState());
+
+        /* Map the memory. */
+        R_TRY(GetCurrentProcess().GetPageTable().MapPageGroup(address, GetReference(this->page_group), KMemoryState_CodeOut, KMemoryPermission_UserReadWrite));
+
+        /* Mark ourselves as mapped. */
+        this->is_mapped = true;
+
+        return ResultSuccess();
+    }
+
+    Result KCodeMemory::Unmap(KProcessAddress address, size_t size) {
+        MESOSPHERE_ASSERT_THIS();
+
+        /* Validate the size. */
+        R_UNLESS(GetReference(this->page_group).GetNumPages() == util::DivideUp(size, PageSize), svc::ResultInvalidSize());
+
+        /* Lock ourselves. */
+        KScopedLightLock lk(this->lock);
+
+        /* Unmap the memory. */
+        R_TRY(GetCurrentProcess().GetPageTable().UnmapPageGroup(address, GetReference(this->page_group), KMemoryState_CodeOut));
+
+        /* Mark ourselves as unmapped. */
+        MESOSPHERE_ASSERT(this->is_mapped);
+        this->is_mapped = false;
+
+        return ResultSuccess();
+    }
+
+    Result KCodeMemory::MapToOwner(KProcessAddress address, size_t size, ams::svc::MemoryPermission perm) {
+        MESOSPHERE_ASSERT_THIS();
+
+        /* Validate the size. */
+        R_UNLESS(GetReference(this->page_group).GetNumPages() == util::DivideUp(size, PageSize), svc::ResultInvalidSize());
+
+        /* Lock ourselves. */
+        KScopedLightLock lk(this->lock);
+
+        /* Ensure we're not already mapped. */
+        R_UNLESS(!this->is_owner_mapped, svc::ResultInvalidState());
+
+        /* Convert the memory permission. */
+        KMemoryPermission k_perm;
+        switch (perm) {
+            case ams::svc::MemoryPermission_Read:        k_perm = KMemoryPermission_UserRead;        break;
+            case ams::svc::MemoryPermission_ReadExecute: k_perm = KMemoryPermission_UserReadExecute; break;
+            MESOSPHERE_UNREACHABLE_DEFAULT_CASE();
+        }
+
+        /* Map the memory. */
+        R_TRY(GetCurrentProcess().GetPageTable().MapPageGroup(address, GetReference(this->page_group), KMemoryState_GeneratedCode, k_perm));
+
+        /* Mark ourselves as mapped. */
+        this->is_owner_mapped = true;
+
+        return ResultSuccess();
+    }
+
+    Result KCodeMemory::UnmapFromOwner(KProcessAddress address, size_t size) {
+        MESOSPHERE_ASSERT_THIS();
+
+        /* Validate the size. */
+        R_UNLESS(GetReference(this->page_group).GetNumPages() == util::DivideUp(size, PageSize), svc::ResultInvalidSize());
+
+        /* Lock ourselves. */
+        KScopedLightLock lk(this->lock);
+
+        /* Unmap the memory. */
+        R_TRY(GetCurrentProcess().GetPageTable().UnmapPageGroup(address, GetReference(this->page_group), KMemoryState_GeneratedCode));
+
+        /* Mark ourselves as unmapped. */
+        MESOSPHERE_ASSERT(this->is_owner_mapped);
+        this->is_owner_mapped = false;
+
+        return ResultSuccess();
+    }
+
+}

libraries/libmesosphere/source/kern_k_page_table_base.cpp

@@ -2665,6 +2665,7 @@ namespace ams::kern {
 
     Result KPageTableBase::SetupForIpcServer(KProcessAddress *out_addr, size_t size, KProcessAddress src_addr, KMemoryPermission test_perm, KMemoryState dst_state, KPageTableBase &src_page_table, bool send) {
         MESOSPHERE_ASSERT(this->IsLockedByCurrentThread());
+        MESOSPHERE_ASSERT(src_page_table.IsLockedByCurrentThread());
 
         /* Check that we can theoretically map. */
         const KProcessAddress region_start = this->alias_region_start;