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-rw-r--r--src/core/memory.cpp25
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;