diff options
| -rw-r--r-- | src/core/memory.cpp | 25 |
1 files changed, 20 insertions, 5 deletions
diff --git a/src/core/memory.cpp b/src/core/memory.cpp index b8438e490..9024f4922 100644 --- a/src/core/memory.cpp +++ b/src/core/memory.cpp @@ -139,7 +139,12 @@ void UnmapRegion(VAddr base, u32 size) { static u8* GetPointerFromVMA(VAddr vaddr) { u8* direct_pointer = nullptr; - auto& vma = Kernel::g_current_process->vm_manager.FindVMA(vaddr)->second; + auto& vm_manager = Kernel::g_current_process->vm_manager; + + auto it = vm_manager.FindVMA(vaddr); + ASSERT(it != vm_manager.vma_map.end()); + + auto& vma = it->second; switch (vma.type) { case Kernel::VMAType::AllocatedMemoryBlock: direct_pointer = vma.backing_block->data() + vma.offset; @@ -147,6 +152,8 @@ static u8* GetPointerFromVMA(VAddr vaddr) { case Kernel::VMAType::BackingMemory: direct_pointer = vma.backing_memory; break; + case Kernel::VMAType::Free: + return nullptr; default: UNREACHABLE(); } @@ -341,11 +348,19 @@ void RasterizerMarkRegionCached(PAddr start, u32 size, int count_delta) { if (res_count == 0) { PageType& page_type = current_page_table->attributes[vaddr >> PAGE_BITS]; switch (page_type) { - case PageType::RasterizerCachedMemory: - page_type = PageType::Memory; - current_page_table->pointers[vaddr >> PAGE_BITS] = - GetPointerFromVMA(vaddr & ~PAGE_MASK); + case PageType::RasterizerCachedMemory: { + u8* pointer = GetPointerFromVMA(vaddr & ~PAGE_MASK); + if (pointer == nullptr) { + // It's possible that this function has called been while updating the pagetable + // after unmapping a VMA. In that case the underlying VMA will no longer exist, + // and we should just leave the pagetable entry blank. + page_type = PageType::Unmapped; + } else { + page_type = PageType::Memory; + current_page_table->pointers[vaddr >> PAGE_BITS] = pointer; + } break; + } case PageType::RasterizerCachedSpecial: page_type = PageType::Special; break; |