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Properly handle file mmaps with offsets

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Pretty easy fix to perform while I'm here, so I might as well include it.
This commit is contained in:
Stephen Miller 2026-01-21 21:30:15 -06:00
parent a0b3ed30fc
commit e5e81e1d52
1 changed files with 8 additions and 1 deletions
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9
src/core/address_space.cpp
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@ -242,7 +242,14 @@ struct AddressSpace::Impl {
ptr = VirtualAlloc2(process, reinterpret_cast<PVOID>(virtual_addr), size, ptr = VirtualAlloc2(process, reinterpret_cast<PVOID>(virtual_addr), size,
MEM_RESERVE | MEM_COMMIT | MEM_REPLACE_PLACEHOLDER, MEM_RESERVE | MEM_COMMIT | MEM_REPLACE_PLACEHOLDER,
PAGE_READWRITE, nullptr, 0); PAGE_READWRITE, nullptr, 0);
bool ret = ReadFile(backing, ptr, size, &resultvar, NULL);
// phys_addr serves as an offset for file mmaps.
// Create an OVERLAPPED with the offset, then supply that to ReadFile
OVERLAPPED param{};
// Offset is the least-significant 32 bits, OffsetHigh is the most-significant.
param.Offset = phys_addr & 0xffffffffull;
param.OffsetHigh = phys_addr & 0xffffffff00000000ull;
bool ret = ReadFile(backing, ptr, size, &resultvar, &param);
ASSERT_MSG(ret, "ReadFile failed. {}", Common::GetLastErrorMsg()); ASSERT_MSG(ret, "ReadFile failed. {}", Common::GetLastErrorMsg());
ret = VirtualProtect(ptr, size, prot, &resultvar); ret = VirtualProtect(ptr, size, prot, &resultvar);
ASSERT_MSG(ret, "VirtualProtect failed. {}", Common::GetLastErrorMsg()); ASSERT_MSG(ret, "VirtualProtect failed. {}", Common::GetLastErrorMsg());