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UserspaceEmulator: Implement a proper VM allocator

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This patch brings Kernel::RangeAllocator to UserspaceEmulator in a
slightly simplified form.

It supports the basic three allocation types needed by virt$mmap():
allocate_anywhere, allocate_specific, and allocate_randomized.

Porting virt$mmap() and virt$munmap() to use the allocator makes
UE work correctly once again. :^)
This commit is contained in:
Andreas Kling 2021-02-06 23:08:51 +01:00
parent 9dacd7c0ec
commit 89483a9408
10 changed files with 438 additions and 36 deletions
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12
Userland/DevTools/UserspaceEmulator/Region.h
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@ -26,6 +26,7 @@
#pragma once
#include "Range.h"
#include "ValueWithShadow.h"
#include <AK/TypeCasts.h>
#include <AK/Types.h>
@ -38,9 +39,11 @@ class Region {
public:
virtual ~Region() { }
u32 base() const { return m_base; }
u32 size() const { return m_size; }
u32 end() const { return m_base + m_size; }
const Range& range() const { return m_range; }
u32 base() const { return m_range.base().get(); }
u32 size() const { return m_range.size(); }
u32 end() const { return m_range.end().get(); }
bool contains(u32 address) const { return address >= base() && address < end(); }
@ -82,8 +85,7 @@ protected:
private:
Emulator& m_emulator;
u32 m_base { 0 };
u32 m_size { 0 };
Range m_range;
bool m_stack { false };
bool m_text { false };