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Merge pull request #7974 from bunnei/improve-code-mem

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Kernel Memory Updates (Part 5): Revamp MapCodeMemory and UnmapCodeMemory.
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bunnei 2022-03-07 20:28:39 -08:00 committed by GitHub
commit 1f37896066
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2 changed files with 117 additions and 48 deletions
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187
src/core/hle/kernel/k_page_table.cpp
View file

@ -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));
if (IsRegionMapped(dst_addr, size)) {
return ResultInvalidCurrentMemory;
}
KPageLinkedList page_linked_list;
AddRegionToPages(src_addr, num_pages, page_linked_list);
{
auto block_guard = detail::ScopeExit(
[&] { Operate(src_addr, num_pages, perm, OperationType::ChangePermissions); });
CASCADE_CODE(Operate(src_addr, num_pages, KMemoryPermission::None,
OperationType::ChangePermissions));
CASCADE_CODE(MapPages(dst_addr, page_linked_list, KMemoryPermission::None));
block_guard.Cancel();
}
block_manager->Update(src_addr, num_pages, state, KMemoryPermission::None,
KMemoryAttribute::Locked);
block_manager->Update(dst_addr, num_pages, KMemoryState::AliasCode);
return ResultSuccess;
}
ResultCode KPageTable::UnmapCodeMemory(VAddr dst_addr, VAddr src_addr, std::size_t size) {
KScopedLightLock lk(general_lock);
if (!size) {
return ResultSuccess;
}
const std::size_t num_pages{size / PageSize};
CASCADE_CODE(CheckMemoryState(nullptr, nullptr, nullptr, nullptr, src_addr, size,
KMemoryState::All, KMemoryState::Normal, KMemoryPermission::None,
KMemoryPermission::None, KMemoryAttribute::Mask,
KMemoryAttribute::Locked, KMemoryAttribute::IpcAndDeviceMapped));
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,
// 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));
CASCADE_CODE(Operate(dst_addr, num_pages, KMemoryPermission::None, OperationType::Unmap));
block_manager->Update(dst_addr, num_pages, KMemoryState::Free);
block_manager->Update(src_addr, num_pages, KMemoryState::Normal,
// Map the code memory.
{
// Determine the number of pages being operated on.
const std::size_t num_pages = size / PageSize;
// Create page groups for the memory being mapped.
KPageLinkedList pg;
AddRegionToPages(src_address, num_pages, pg);
// 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));
// 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());
});
// Map the alias pages.
R_TRY(MapPages(dst_address, pg, new_perm));
// 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_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);
// 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;
}
}
// Ensure that we maintain the instruction cache.
bool reprotected_pages = false;
SCOPE_EXIT({
if (reprotected_pages && any_code_pages) {
system.InvalidateCpuInstructionCacheRange(dst_address, size);
}
});
// Unmap.
{
// Determine the number of pages being operated on.
const std::size_t num_pages = size / PageSize;
// Unmap the aliased copy of the pages.
R_TRY(Operate(dst_address, num_pages, KMemoryPermission::None, OperationType::Unmap));
// 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));
// 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);
system.InvalidateCpuInstructionCacheRange(dst_addr, size);
// Note that we reprotected pages.
reprotected_pages = true;
}
return ResultSuccess;
}

4
src/core/hle/kernel/k_page_table.h
View file

@ -36,8 +36,8 @@ public:
KMemoryManager::Pool pool);
ResultCode MapProcessCode(VAddr addr, std::size_t pages_count, KMemoryState state,
KMemoryPermission perm);
ResultCode MapCodeMemory(VAddr dst_addr, VAddr src_addr, std::size_t size);
ResultCode UnmapCodeMemory(VAddr dst_addr, VAddr src_addr, std::size_t size);
ResultCode MapCodeMemory(VAddr dst_address, VAddr src_address, std::size_t size);
ResultCode UnmapCodeMemory(VAddr dst_address, VAddr src_address, std::size_t size);
ResultCode UnmapProcessMemory(VAddr dst_addr, std::size_t size, KPageTable& src_page_table,
VAddr src_addr);
ResultCode MapPhysicalMemory(VAddr addr, std::size_t size);