diff options
Diffstat (limited to '')
-rw-r--r-- | src/core/hle/kernel/k_page_table.cpp | 159 |
1 files changed, 114 insertions, 45 deletions
diff --git a/src/core/hle/kernel/k_page_table.cpp b/src/core/hle/kernel/k_page_table.cpp index dfea0b6e2..0602de1f7 100644 --- a/src/core/hle/kernel/k_page_table.cpp +++ b/src/core/hle/kernel/k_page_table.cpp @@ -285,72 +285,141 @@ ResultCode KPageTable::MapProcessCode(VAddr addr, std::size_t num_pages, KMemory return ResultSuccess; } -ResultCode KPageTable::MapCodeMemory(VAddr dst_addr, VAddr src_addr, std::size_t size) { +ResultCode KPageTable::MapCodeMemory(VAddr dst_address, VAddr src_address, std::size_t size) { + // Validate the mapping request. + R_UNLESS(this->CanContain(dst_address, size, KMemoryState::AliasCode), + ResultInvalidMemoryRegion); + + // Lock the table. KScopedLightLock lk(general_lock); - const std::size_t num_pages{size / PageSize}; + // Verify that the source memory is normal heap. + KMemoryState src_state{}; + KMemoryPermission src_perm{}; + std::size_t num_src_allocator_blocks{}; + R_TRY(this->CheckMemoryState(&src_state, &src_perm, nullptr, &num_src_allocator_blocks, + src_address, size, KMemoryState::All, KMemoryState::Normal, + KMemoryPermission::All, KMemoryPermission::UserReadWrite, + KMemoryAttribute::All, KMemoryAttribute::None)); - KMemoryState state{}; - KMemoryPermission perm{}; - CASCADE_CODE(CheckMemoryState(&state, &perm, nullptr, nullptr, src_addr, size, - KMemoryState::All, KMemoryState::Normal, KMemoryPermission::All, - KMemoryPermission::UserReadWrite, KMemoryAttribute::Mask, - KMemoryAttribute::None, KMemoryAttribute::IpcAndDeviceMapped)); + // Verify that the destination memory is unmapped. + std::size_t num_dst_allocator_blocks{}; + R_TRY(this->CheckMemoryState(&num_dst_allocator_blocks, dst_address, size, KMemoryState::All, + KMemoryState::Free, KMemoryPermission::None, + KMemoryPermission::None, KMemoryAttribute::None, + KMemoryAttribute::None)); - if (IsRegionMapped(dst_addr, size)) { - return ResultInvalidCurrentMemory; - } + // Map the code memory. + { + // Determine the number of pages being operated on. + const std::size_t num_pages = size / PageSize; - KPageLinkedList page_linked_list; - AddRegionToPages(src_addr, num_pages, page_linked_list); + // Create page groups for the memory being mapped. + KPageLinkedList pg; + AddRegionToPages(src_address, num_pages, pg); - { - auto block_guard = detail::ScopeExit( - [&] { Operate(src_addr, num_pages, perm, OperationType::ChangePermissions); }); + // Reprotect the source as kernel-read/not mapped. + const auto new_perm = static_cast<KMemoryPermission>(KMemoryPermission::KernelRead | + KMemoryPermission::NotMapped); + R_TRY(Operate(src_address, num_pages, new_perm, OperationType::ChangePermissions)); - CASCADE_CODE(Operate(src_addr, num_pages, KMemoryPermission::None, - OperationType::ChangePermissions)); - CASCADE_CODE(MapPages(dst_addr, page_linked_list, KMemoryPermission::None)); + // Ensure that we unprotect the source pages on failure. + auto unprot_guard = SCOPE_GUARD({ + ASSERT(this->Operate(src_address, num_pages, src_perm, OperationType::ChangePermissions) + .IsSuccess()); + }); - block_guard.Cancel(); - } + // Map the alias pages. + R_TRY(MapPages(dst_address, pg, new_perm)); - block_manager->Update(src_addr, num_pages, state, KMemoryPermission::None, - KMemoryAttribute::Locked); - block_manager->Update(dst_addr, num_pages, KMemoryState::AliasCode); + // We successfully mapped the alias pages, so we don't need to unprotect the src pages on + // failure. + unprot_guard.Cancel(); + + // Apply the memory block updates. + block_manager->Update(src_address, num_pages, src_state, new_perm, + KMemoryAttribute::Locked); + block_manager->Update(dst_address, num_pages, KMemoryState::AliasCode, new_perm, + KMemoryAttribute::None); + } return ResultSuccess; } -ResultCode KPageTable::UnmapCodeMemory(VAddr dst_addr, VAddr src_addr, std::size_t size) { +ResultCode KPageTable::UnmapCodeMemory(VAddr dst_address, VAddr src_address, std::size_t size) { + // Validate the mapping request. + R_UNLESS(this->CanContain(dst_address, size, KMemoryState::AliasCode), + ResultInvalidMemoryRegion); + + // Lock the table. KScopedLightLock lk(general_lock); - if (!size) { - return ResultSuccess; + // Verify that the source memory is locked normal heap. + std::size_t num_src_allocator_blocks{}; + R_TRY(this->CheckMemoryState(std::addressof(num_src_allocator_blocks), src_address, size, + KMemoryState::All, KMemoryState::Normal, KMemoryPermission::None, + KMemoryPermission::None, KMemoryAttribute::All, + KMemoryAttribute::Locked)); + + // Verify that the destination memory is aliasable code. + std::size_t num_dst_allocator_blocks{}; + R_TRY(this->CheckMemoryStateContiguous( + std::addressof(num_dst_allocator_blocks), dst_address, size, KMemoryState::FlagCanCodeAlias, + KMemoryState::FlagCanCodeAlias, KMemoryPermission::None, KMemoryPermission::None, + KMemoryAttribute::All, KMemoryAttribute::None)); + + // Determine whether any pages being unmapped are code. + bool any_code_pages = false; + { + KMemoryBlockManager::const_iterator it = block_manager->FindIterator(dst_address); + while (true) { + // Get the memory info. + const KMemoryInfo info = it->GetMemoryInfo(); + + // Check if the memory has code flag. + if ((info.GetState() & KMemoryState::FlagCode) != KMemoryState::None) { + any_code_pages = true; + break; + } + + // Check if we're done. + if (dst_address + size - 1 <= info.GetLastAddress()) { + break; + } + + // Advance. + ++it; + } } - const std::size_t num_pages{size / PageSize}; + // Ensure that we maintain the instruction cache. + bool reprotected_pages = false; + SCOPE_EXIT({ + if (reprotected_pages && any_code_pages) { + system.InvalidateCpuInstructionCacheRange(dst_address, size); + } + }); - CASCADE_CODE(CheckMemoryState(nullptr, nullptr, nullptr, nullptr, src_addr, size, - KMemoryState::All, KMemoryState::Normal, KMemoryPermission::None, - KMemoryPermission::None, KMemoryAttribute::Mask, - KMemoryAttribute::Locked, KMemoryAttribute::IpcAndDeviceMapped)); + // Unmap. + { + // Determine the number of pages being operated on. + const std::size_t num_pages = size / PageSize; - KMemoryState state{}; - CASCADE_CODE(CheckMemoryState( - &state, nullptr, nullptr, nullptr, dst_addr, PageSize, KMemoryState::FlagCanCodeAlias, - KMemoryState::FlagCanCodeAlias, KMemoryPermission::None, KMemoryPermission::None, - KMemoryAttribute::Mask, KMemoryAttribute::None, KMemoryAttribute::IpcAndDeviceMapped)); - CASCADE_CODE(CheckMemoryState(dst_addr, size, KMemoryState::All, state, KMemoryPermission::None, - KMemoryPermission::None, KMemoryAttribute::Mask, - KMemoryAttribute::None)); - CASCADE_CODE(Operate(dst_addr, num_pages, KMemoryPermission::None, OperationType::Unmap)); + // Unmap the aliased copy of the pages. + R_TRY(Operate(dst_address, num_pages, KMemoryPermission::None, OperationType::Unmap)); - block_manager->Update(dst_addr, num_pages, KMemoryState::Free); - block_manager->Update(src_addr, num_pages, KMemoryState::Normal, - KMemoryPermission::UserReadWrite); + // Try to set the permissions for the source pages back to what they should be. + R_TRY(Operate(src_address, num_pages, KMemoryPermission::UserReadWrite, + OperationType::ChangePermissions)); - system.InvalidateCpuInstructionCacheRange(dst_addr, size); + // Apply the memory block updates. + block_manager->Update(dst_address, num_pages, KMemoryState::None); + block_manager->Update(src_address, num_pages, KMemoryState::Normal, + KMemoryPermission::UserReadWrite); + + // Note that we reprotected pages. + reprotected_pages = true; + } return ResultSuccess; } |