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core: hle: kernel: k_page_table: Add implementations of MapPages, UnmapPages, and FindFreeArea for TLS.

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This commit is contained in:
bunnei 2022-03-11 16:39:36 -08:00
parent 15d9b0418f
commit 3210bc2767
2 changed files with 141 additions and 2 deletions
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126
src/core/hle/kernel/k_page_table.cpp
View file

@ -424,6 +424,68 @@ ResultCode KPageTable::UnmapCodeMemory(VAddr dst_address, VAddr src_address, std
return ResultSuccess;
}
VAddr KPageTable::FindFreeArea(VAddr region_start, std::size_t region_num_pages,
std::size_t num_pages, std::size_t alignment, std::size_t offset,
std::size_t guard_pages) {
VAddr address = 0;
if (num_pages <= region_num_pages) {
if (this->IsAslrEnabled()) {
// Try to directly find a free area up to 8 times.
for (std::size_t i = 0; i < 8; i++) {
const std::size_t random_offset =
KSystemControl::GenerateRandomRange(
0, (region_num_pages - num_pages - guard_pages) * PageSize / alignment) *
alignment;
const VAddr candidate =
Common::AlignDown((region_start + random_offset), alignment) + offset;
KMemoryInfo info = this->QueryInfoImpl(candidate);
if (info.state != KMemoryState::Free) {
continue;
}
if (region_start > candidate) {
continue;
}
if (info.GetAddress() + guard_pages * PageSize > candidate) {
continue;
}
const VAddr candidate_end = candidate + (num_pages + guard_pages) * PageSize - 1;
if (candidate_end > info.GetLastAddress()) {
continue;
}
if (candidate_end > region_start + region_num_pages * PageSize - 1) {
continue;
}
address = candidate;
break;
}
// Fall back to finding the first free area with a random offset.
if (address == 0) {
// NOTE: Nintendo does not account for guard pages here.
// This may theoretically cause an offset to be chosen that cannot be mapped. We
// will account for guard pages.
const std::size_t offset_pages = KSystemControl::GenerateRandomRange(
0, region_num_pages - num_pages - guard_pages);
address = block_manager->FindFreeArea(region_start + offset_pages * PageSize,
region_num_pages - offset_pages, num_pages,
alignment, offset, guard_pages);
}
}
// Find the first free area.
if (address == 0) {
address = block_manager->FindFreeArea(region_start, region_num_pages, num_pages,
alignment, offset, guard_pages);
}
}
return address;
}
ResultCode KPageTable::UnmapProcessMemory(VAddr dst_addr, std::size_t size,
KPageTable& src_page_table, VAddr src_addr) {
KScopedLightLock lk(general_lock);
@ -1055,6 +1117,46 @@ ResultCode KPageTable::MapPages(VAddr address, KPageLinkedList& page_linked_list
return ResultSuccess;
}
ResultCode KPageTable::MapPages(VAddr* out_addr, std::size_t num_pages, std::size_t alignment,
PAddr phys_addr, bool is_pa_valid, VAddr region_start,
std::size_t region_num_pages, KMemoryState state,
KMemoryPermission perm) {
ASSERT(Common::IsAligned(alignment, PageSize) && alignment >= PageSize);
// Ensure this is a valid map request.
R_UNLESS(this->CanContain(region_start, region_num_pages * PageSize, state),
ResultInvalidCurrentMemory);
R_UNLESS(num_pages < region_num_pages, ResultOutOfMemory);
// Lock the table.
KScopedLightLock lk(general_lock);
// Find a random address to map at.
VAddr addr = this->FindFreeArea(region_start, region_num_pages, num_pages, alignment, 0,
this->GetNumGuardPages());
R_UNLESS(addr != 0, ResultOutOfMemory);
ASSERT(Common::IsAligned(addr, alignment));
ASSERT(this->CanContain(addr, num_pages * PageSize, state));
ASSERT(this->CheckMemoryState(addr, num_pages * PageSize, KMemoryState::All, KMemoryState::Free,
KMemoryPermission::None, KMemoryPermission::None,
KMemoryAttribute::None, KMemoryAttribute::None)
.IsSuccess());
// Perform mapping operation.
if (is_pa_valid) {
R_TRY(this->Operate(addr, num_pages, perm, OperationType::Map, phys_addr));
} else {
UNIMPLEMENTED();
}
// Update the blocks.
block_manager->Update(addr, num_pages, state, perm);
// We successfully mapped the pages.
*out_addr = addr;
return ResultSuccess;
}
ResultCode KPageTable::UnmapPages(VAddr addr, const KPageLinkedList& page_linked_list) {
ASSERT(this->IsLockedByCurrentThread());
@ -1097,6 +1199,30 @@ ResultCode KPageTable::UnmapPages(VAddr addr, KPageLinkedList& page_linked_list,
return ResultSuccess;
}
ResultCode KPageTable::UnmapPages(VAddr address, std::size_t num_pages, KMemoryState state) {
// Check that the unmap is in range.
const std::size_t size = num_pages * PageSize;
R_UNLESS(this->Contains(address, size), ResultInvalidCurrentMemory);
// Lock the table.
KScopedLightLock lk(general_lock);
// Check the memory state.
std::size_t num_allocator_blocks{};
R_TRY(this->CheckMemoryState(std::addressof(num_allocator_blocks), address, size,
KMemoryState::All, state, KMemoryPermission::None,
KMemoryPermission::None, KMemoryAttribute::All,
KMemoryAttribute::None));
// Perform the unmap.
R_TRY(Operate(address, num_pages, KMemoryPermission::None, OperationType::Unmap));
// Update the blocks.
block_manager->Update(address, num_pages, KMemoryState::Free, KMemoryPermission::None);
return ResultSuccess;
}
ResultCode KPageTable::SetProcessMemoryPermission(VAddr addr, std::size_t size,
Svc::MemoryPermission svc_perm) {
const size_t num_pages = size / PageSize;

17
src/core/hle/kernel/k_page_table.h
View file

@ -46,7 +46,14 @@ public:
ResultCode UnmapMemory(VAddr dst_addr, VAddr src_addr, std::size_t size);
ResultCode MapPages(VAddr addr, KPageLinkedList& page_linked_list, KMemoryState state,
KMemoryPermission perm);
ResultCode MapPages(VAddr* out_addr, std::size_t num_pages, std::size_t alignment,
PAddr phys_addr, KMemoryState state, KMemoryPermission perm) {
return this->MapPages(out_addr, num_pages, alignment, phys_addr, true,
this->GetRegionAddress(state), this->GetRegionSize(state) / PageSize,
state, perm);
}
ResultCode UnmapPages(VAddr addr, KPageLinkedList& page_linked_list, KMemoryState state);
ResultCode UnmapPages(VAddr address, std::size_t num_pages, KMemoryState state);
ResultCode SetProcessMemoryPermission(VAddr addr, std::size_t size,
Svc::MemoryPermission svc_perm);
KMemoryInfo QueryInfo(VAddr addr);
@ -91,6 +98,9 @@ private:
ResultCode InitializeMemoryLayout(VAddr start, VAddr end);
ResultCode MapPages(VAddr addr, const KPageLinkedList& page_linked_list,
KMemoryPermission perm);
ResultCode MapPages(VAddr* out_addr, std::size_t num_pages, std::size_t alignment,
PAddr phys_addr, bool is_pa_valid, VAddr region_start,
std::size_t region_num_pages, KMemoryState state, KMemoryPermission perm);
ResultCode UnmapPages(VAddr addr, const KPageLinkedList& page_linked_list);
bool IsRegionMapped(VAddr address, u64 size);
bool IsRegionContiguous(VAddr addr, u64 size) const;
@ -105,6 +115,9 @@ private:
VAddr GetRegionAddress(KMemoryState state) const;
std::size_t GetRegionSize(KMemoryState state) const;
VAddr FindFreeArea(VAddr region_start, std::size_t region_num_pages, std::size_t num_pages,
std::size_t alignment, std::size_t offset, std::size_t guard_pages);
ResultCode CheckMemoryStateContiguous(std::size_t* out_blocks_needed, VAddr addr,
std::size_t size, KMemoryState state_mask,
KMemoryState state, KMemoryPermission perm_mask,
@ -137,7 +150,7 @@ private:
return CheckMemoryState(nullptr, nullptr, nullptr, out_blocks_needed, addr, size,
state_mask, state, perm_mask, perm, attr_mask, attr, ignore_attr);
}
ResultCode CheckMemoryState(VAddr addr, size_t size, KMemoryState state_mask,
ResultCode CheckMemoryState(VAddr addr, std::size_t size, KMemoryState state_mask,
KMemoryState state, KMemoryPermission perm_mask,
KMemoryPermission perm, KMemoryAttribute attr_mask,
KMemoryAttribute attr,
@ -210,7 +223,7 @@ public:
constexpr VAddr GetAliasCodeRegionSize() const {
return alias_code_region_end - alias_code_region_start;
}
size_t GetNormalMemorySize() {
std::size_t GetNormalMemorySize() {
KScopedLightLock lk(general_lock);
return GetHeapSize() + mapped_physical_memory_size;
}