| // Copyright 2018 The Crashpad Authors. All rights reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "snapshot/fuchsia/memory_map_region_snapshot_fuchsia.h" |
| |
| #include "base/logging.h" |
| #include "base/stl_util.h" |
| |
| namespace crashpad { |
| namespace internal { |
| |
| namespace { |
| |
| // Maps from bitwise OR of Zircon's flags to enumerated Windows version. |
| uint32_t MmuFlagsToProtectFlags(zx_vm_option_t flags) { |
| // These bits are currently the lowest 3 of zx_vm_option_t. They're used to |
| // index into a mapping array, so make sure that we notice if they change |
| // values. |
| static_assert( |
| ZX_VM_PERM_READ == 1 && ZX_VM_PERM_WRITE == 2 && ZX_VM_PERM_EXECUTE == 4, |
| "table below will need fixing"); |
| |
| // The entries set to zero don't have good corresponding Windows minidump |
| // names. They also aren't currently supported by the mapping syscall on |
| // Zircon, so DCHECK that they don't happen in practice. EXECUTE-only also |
| // cannot currently happen, but as that has a good mapping to the Windows |
| // value, leave it in place in case it's supported by the syscall in the |
| // future. |
| static constexpr uint32_t mapping[] = { |
| /* --- */ PAGE_NOACCESS, |
| /* --r */ PAGE_READONLY, |
| /* -w- */ 0, |
| /* -wr */ PAGE_READWRITE, |
| /* x-- */ PAGE_EXECUTE, |
| /* x-r */ PAGE_EXECUTE_READ, |
| /* xw- */ 0, |
| /* xwr */ PAGE_EXECUTE_READWRITE, |
| }; |
| |
| const uint32_t index = |
| flags & (ZX_VM_PERM_READ | ZX_VM_PERM_WRITE | ZX_VM_PERM_EXECUTE); |
| DCHECK_LT(index, base::size(mapping)); |
| |
| const uint32_t protect_flags = mapping[index]; |
| DCHECK_NE(protect_flags, 0u); |
| return protect_flags; |
| } |
| |
| } // namespace |
| |
| MemoryMapRegionSnapshotFuchsia::MemoryMapRegionSnapshotFuchsia( |
| const zx_info_maps_t& info_map) |
| : memory_info_() { |
| DCHECK_EQ(info_map.type, ZX_INFO_MAPS_TYPE_MAPPING); |
| |
| memory_info_.BaseAddress = info_map.base; |
| memory_info_.AllocationBase = info_map.base; |
| memory_info_.RegionSize = info_map.size; |
| memory_info_.State = MEM_COMMIT; |
| memory_info_.Protect = memory_info_.AllocationProtect = |
| MmuFlagsToProtectFlags(info_map.u.mapping.mmu_flags); |
| memory_info_.Type = MEM_MAPPED; |
| } |
| |
| MemoryMapRegionSnapshotFuchsia::~MemoryMapRegionSnapshotFuchsia() {} |
| |
| const MINIDUMP_MEMORY_INFO& |
| MemoryMapRegionSnapshotFuchsia::AsMinidumpMemoryInfo() const { |
| return memory_info_; |
| } |
| |
| } // namespace internal |
| } // namespace crashpad |