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UserspaceEmulator: Support munmap/mprotect with partial mappings

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Fixes #5663.
This commit is contained in:
Ben Wiederhake 2021-03-08 19:20:09 +01:00 • committed by Andreas Kling
parent 45443f24ec
commit 1e857de263
3 changed files with 70 additions and 17 deletions
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22
Userland/DevTools/UserspaceEmulator/SoftMMU.h
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@ -87,6 +87,28 @@ public:
}
}
template<typename Callback>
void for_regions_in(X86::LogicalAddress address, size_t size, Callback callback)
{
VERIFY(size > 0);
X86::LogicalAddress address_end = address;
address_end.set_offset(address_end.offset() + size);
ensure_split_at(address);
ensure_split_at(address_end);
size_t first_page = address.offset() / PAGE_SIZE;
size_t last_page = (address_end.offset() - 1) / PAGE_SIZE;
Region* last_reported = nullptr;
for (size_t page = first_page; page <= last_page; ++page) {
Region* current_region = m_page_to_region_map[page];
if (page != first_page && current_region == last_reported)
continue;
if (callback(current_region) == IterationDecision::Break)
return;
last_reported = current_region;
}
}
private:
Emulator& m_emulator;