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Fix edge case in MapMemory

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Code comments explain everything.
This should fix some memory asserts.
This commit is contained in:
Stephen Miller 2025-05-08 22:42:24 -05:00
parent c06053e4e8
commit deb02db7bc
1 changed files with 15 additions and 3 deletions
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18
src/core/memory.cpp
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@ -346,9 +346,21 @@ int MemoryManager::MapMemory(void** out_addr, VAddr virtual_addr, size_t size, M
// Fixed mapping means the virtual address must exactly match the provided one.
if (True(flags & MemoryMapFlags::Fixed)) {
// This should return SCE_KERNEL_ERROR_ENOMEM but shouldn't normally happen.
const auto& vma = FindVMA(mapped_addr)->second;
const size_t remaining_size = vma.base + vma.size - mapped_addr;
auto vma = FindVMA(mapped_addr)->second;
// There's a possible edge case where we're mapping to a partially reserved range.
// To account for this, unmap any reserved areas within this mapping range first.
auto unmap_addr = mapped_addr;
auto unmap_size = size;
while (!vma.IsMapped() && vma.base < mapped_addr + size) {
auto unmapped = UnmapBytesFromEntry(unmap_addr, vma, unmap_size);
unmap_addr += unmapped;
unmap_size -= unmapped;
vma = FindVMA(unmap_addr)->second;
}
// This should return SCE_KERNEL_ERROR_ENOMEM but rarely happens.
vma = FindVMA(mapped_addr)->second;
size_t remaining_size = vma.base + vma.size - mapped_addr;
ASSERT_MSG(!vma.IsMapped() && remaining_size >= size,
"Memory region {:#x} to {:#x} isn't free enough to map region {:#x} to {:#x}",
vma.base, vma.base + vma.size, virtual_addr, virtual_addr + size);