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kernel: memory: Add system_control code, which will be used for ASLR support.

This commit is contained in:
bunnei 2020-04-05 14:48:50 -04:00
parent fc040b5b70
commit 81cb4d3c7f
3 changed files with 61 additions and 0 deletions

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@ -159,6 +159,8 @@ add_library(core STATIC
hle/kernel/memory/memory_block.h
hle/kernel/memory/memory_types.h
hle/kernel/memory/slab_heap.h
hle/kernel/memory/system_control.cpp
hle/kernel/memory/system_control.h
hle/kernel/mutex.cpp
hle/kernel/mutex.h
hle/kernel/object.cpp

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@ -0,0 +1,41 @@
// Copyright 2020 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <random>
#include "core/hle/kernel/memory/system_control.h"
namespace Kernel::Memory::SystemControl {
u64 GenerateRandomU64ForInit() {
std::random_device device;
std::mt19937 gen(device());
std::uniform_int_distribution<u64> distribution(1, std::numeric_limits<u64>::max());
return distribution(gen);
}
template <typename F>
u64 GenerateUniformRange(u64 min, u64 max, F f) {
/* Handle the case where the difference is too large to represent. */
if (max == std::numeric_limits<u64>::max() && min == std::numeric_limits<u64>::min()) {
return f();
}
/* Iterate until we get a value in range. */
const u64 range_size = ((max + 1) - min);
const u64 effective_max = (std::numeric_limits<u64>::max() / range_size) * range_size;
while (true) {
if (const u64 rnd = f(); rnd < effective_max) {
return min + (rnd % range_size);
}
}
}
u64 GenerateRandomRange(u64 min, u64 max) {
return GenerateUniformRange(min, max, GenerateRandomU64ForInit);
}
} // namespace Kernel::Memory::SystemControl

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@ -0,0 +1,18 @@
// Copyright 2020 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include "common/common_types.h"
namespace Kernel::Memory::SystemControl {
u64 GenerateRandomU64ForInit();
template <typename F>
u64 GenerateUniformRange(u64 min, u64 max, F f);
u64 GenerateRandomRange(u64 min, u64 max);
} // namespace Kernel::Memory::SystemControl