Lightemerald/windows-user-space-emulator
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Comprehensive WOW64 subsystem implementation

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This commit is contained in:
brian
2025-10-13 19:53:14 +08:00
parent 9453123db0
commit 65eecf1cfd
51 changed files with 3772 additions and 283 deletions
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44
src/windows-emulator/memory_manager.cpp
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@@ -472,9 +472,9 @@ void memory_manager::unmap_all_memory()
this->reserved_regions_.clear();
}
uint64_t memory_manager::allocate_memory(const size_t size, const nt_memory_permission permissions, const bool reserve_only)
uint64_t memory_manager::allocate_memory(const size_t size, const nt_memory_permission permissions, const bool reserve_only, uint64_t start)
{
const auto allocation_base = this->find_free_allocation_base(size);
const auto allocation_base = this->find_free_allocation_base(size, start);
if (!allocate_memory(allocation_base, size, permissions, reserve_only))
{
return 0;
@@ -485,28 +485,42 @@ uint64_t memory_manager::allocate_memory(const size_t size, const nt_memory_perm
uint64_t memory_manager::find_free_allocation_base(const size_t size, const uint64_t start) const
{
uint64_t start_address = std::max(MIN_ALLOCATION_ADDRESS, start ? start : 0x100000000ULL);
uint64_t start_address = std::max(static_cast<uint64_t>(MIN_ALLOCATION_ADDRESS), start ? start : this->default_allocation_address_);
start_address = align_up(start_address, ALLOCATION_GRANULARITY);
for (const auto& region : this->reserved_regions_)
// Since reserved_regions_ is a sorted map, we can iterate through it
// and find gaps between regions
while (start_address + size <= MAX_ALLOCATION_ADDRESS)
{
const auto region_end = region.first + region.second.length;
if (region_end < start_address)
bool conflict = false;
// Check if the proposed range [start_address, start_address+size) conflicts with any existing region
for (const auto& region : this->reserved_regions_)
{
continue;
// If this region ends before our start, skip it
if (region.first + region.second.length <= start_address)
{
continue;
}
// If this region starts after our end, we're done checking (map is sorted)
if (region.first >= start_address + size)
{
break;
}
// Otherwise, we have a conflict
conflict = true;
// Move start_address past this conflicting region
start_address = align_up(region.first + region.second.length, ALLOCATION_GRANULARITY);
break;
}
if (!regions_with_length_intersect(start_address, size, region.first, region.second.length))
// If no conflict was found, we have our address
if (!conflict)
{
return start_address;
}
start_address = align_up(region_end, ALLOCATION_GRANULARITY);
}
if (start_address + size <= MAX_ALLOCATION_ADDRESS)
{
return start_address;
}
return 0;