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Copy pathmemorymanager.cpp
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382 lines (328 loc) · 12 KB
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#include "version.h"
#include "REL/Relocation.h"
#include "SKSE/API.h"
#include "SKSE/CodeGenerator.h"
#include "SKSE/SafeWrite.h"
#include "SKSE/Trampoline.h"
#include "RE/MemoryManager.h"
#include "config.h"
#include "tbb/scalable_allocator.h"
#include "xbyak/xbyak.h"
#define _DEBUG
namespace RE
{
struct BSThreadEvent
{
static void InitSDM()
{
using func_t = decltype(&BSThreadEvent::InitSDM);
// REL::Relocation<func_t> func{ REL::ID(67151) };
REL::Offset<func_t> func(0xc485e0);
return func();
}
};
}
namespace
{
std::byte* g_trash{ nullptr }; // a dumb workaround for reads from/writes to zero size allocations
namespace detail
{
struct asm_patch :
Xbyak::CodeGenerator
{
asm_patch(std::uintptr_t a_dst)
{
mov(rax, a_dst);
jmp(rax);
}
};
}
void asm_jump(std::uintptr_t a_from, [[maybe_unused]] std::size_t a_size, std::uintptr_t a_to)
{
detail::asm_patch p{ a_to };
p.ready();
assert(p.getSize() <= a_size);
//REL::safe_write(
// a_from,
// std::span{ p.getCode<const std::byte*>(), p.getSize() });
SKSE::SafeWriteBuf(a_from, p.getCode<const std::byte*>(), p.getSize());
}
namespace AutoScrapBuffer
{
void Ctor()
{
//REL::Relocation<std::uintptr_t> target{ REL::ID(66853), 0x1D };
REL::Offset<std::uintptr_t> target = 0xc3cd90 + 0x1D;
constexpr std::size_t size = 0x32 - 0x1D;
//REL::safe_fill(target.address(), REL::NOP, size);
for (int i = 0; i < size; ++i)
{
SKSE::SafeWrite8(target.GetAddress() + i, 0x90);
}
}
void Dtor()
{
// REL::Relocation<std::uintptr_t> base{ REL::ID(66854) };
REL::Offset<std::uintptr_t> base = 0xc3ce20;
{
struct Patch :
Xbyak::CodeGenerator
{
Patch()
{
xor_(rax, rax);
cmp(rbx, rax);
}
};
const auto dst = base.GetAddress() + 0x12;
constexpr std::size_t size = 0x2F - 0x12;
for (int i = 0; i < size; ++i)
{
SKSE::SafeWrite8(dst + i, 0x90);
}
//REL::safe_fill(dst, REL::NOP, size);
Patch p;
p.ready();
assert(p.getSize() <= size);
//REL::safe_write(
// dst,
// stl::span{ p.getCode<const std::byte*>(), p.getSize() });
SKSE::SafeWriteBuf(dst, p.getCode<const std::byte*>(), p.getSize());
}
{
const auto dst = base.GetAddress() + 0x2F;
// REL::safe_write(dst, std::uint8_t{ 0x74 }); // jnz -> jz
SKSE::SafeWrite8(dst, 0x74);
}
}
void Install()
{
Ctor();
Dtor();
}
}
namespace MemoryManager
{
void* Allocate_tbb(RE::MemoryManager*, std::size_t a_size, std::uint32_t a_alignment, bool a_alignmentRequired)
{
if (a_size > 0) {
return a_alignmentRequired ?
scalable_aligned_malloc(a_size, a_alignment) :
scalable_malloc(a_size);
}
else
return g_trash;
}
void Deallocate_tbb(RE::MemoryManager*, void* a_mem, bool a_alignmentRequired)
{
if ((a_mem != g_trash) && (a_mem != nullptr)) {
a_alignmentRequired ?
scalable_aligned_free(a_mem) :
scalable_free(a_mem);
}
}
void* Reallocate_tbb(RE::MemoryManager* a_self, void* a_oldMem, std::size_t a_newSize, std::uint32_t a_alignment, bool a_alignmentRequired)
{
if (a_oldMem == g_trash)
return Allocate_tbb(a_self, a_newSize, a_alignment, a_alignmentRequired);
else
return a_alignmentRequired ?
scalable_aligned_realloc(a_oldMem, a_newSize, a_alignment) :
scalable_realloc(a_oldMem, a_newSize);
}
void* Allocate_sys(RE::MemoryManager*, std::size_t a_size, std::uint32_t a_alignment, bool a_alignmentRequired)
{
if (a_size > 0) {
return a_alignmentRequired ?
_aligned_malloc(a_size, a_alignment) :
malloc(a_size);
}
else
return g_trash;
}
void Deallocate_sys(RE::MemoryManager*, void* a_mem, bool a_alignmentRequired)
{
if ((a_mem != g_trash) && (a_mem != nullptr)) {
a_alignmentRequired ?
_aligned_free(a_mem) :
free(a_mem);
}
}
void* Reallocate_sys(RE::MemoryManager* a_self, void* a_oldMem, std::size_t a_newSize, std::uint32_t a_alignment, bool a_alignmentRequired)
{
if (a_oldMem == g_trash)
return Allocate_sys(a_self, a_newSize, a_alignment, a_alignmentRequired);
else
return a_alignmentRequired ?
_aligned_realloc(a_oldMem, a_newSize, a_alignment) :
realloc(a_oldMem, a_newSize);
}
void ReplaceAllocRoutines()
{
void* allocFunc = &Allocate_tbb;
void* deallocFunc = &Deallocate_tbb;
void* reallocFunc = &Reallocate_tbb;
switch (config::selectAllocators) {
case 0: {
allocFunc = &Allocate_tbb;
deallocFunc = &Deallocate_tbb;
reallocFunc = &Reallocate_tbb;
break;
}
case 1: {
allocFunc = &Allocate_sys;
deallocFunc = &Deallocate_sys;
reallocFunc = &Reallocate_sys;
break;
}
default: {
allocFunc = &Allocate_sys;
deallocFunc = &Deallocate_sys;
reallocFunc = &Reallocate_sys;
break;
}
}
using tuple_t = std::tuple<std::uint64_t, std::size_t, void*>;
const std::array todo{
//tuple_t{ 66859, 0x248, &Allocate },
//tuple_t{ 66861, 0x114, &Deallocate },
//tuple_t{ 66860, 0xA7, &Reallocate },
tuple_t{ 0xc3d0e0, 0x248, allocFunc },
tuple_t{ 0xc3d3e0, 0x114, deallocFunc },
tuple_t{ 0xc3d330, 0xA7, reallocFunc },
};
for (const auto& [id, size, func] : todo)
{
// REL::Relocation<std::uintptr_t> target{ REL::ID(id) };
REL::Offset<std::uintptr_t> target = id;
for (int i = 0; i < size; ++i)
{
SKSE::SafeWrite8(target.GetAddress() + i, 0xCC);
}
//REL::safe_fill(target.address(), REL::INT3, size);
asm_jump(target.GetAddress(), size, reinterpret_cast<std::uintptr_t>(func));
}
}
void StubInit()
{
// REL::Relocation<std::uintptr_t> target{ REL::ID(66862) };
REL::Offset<std::uintptr_t> target = 0xc3d550;
// REL::safe_fill(target.address(), REL::INT3, 0x9E);
for (int i = 0; i < 0x9E; ++i)
{
SKSE::SafeWrite8(target.GetAddress() + i, 0xCC);
}
// REL::safe_write(target.address(), REL::RET);
SKSE::SafeWrite8(target.GetAddress(), 0xC3);
}
void patchInit() {
// Allocator init offset for VR
const uintptr_t AllocatorInitFunc = REL::Module::BaseAddr() + 0x5A2CB0;
// Return immediately from start of func - replacing "40 57 push rdi" with "C3 90 - ret nop"
SKSE::SafeWrite8(AllocatorInitFunc, 0xC3);
SKSE::SafeWrite8(AllocatorInitFunc + 1, 0x90);
_VMESSAGE("Performed OS allocators patch successfully");
return;
}
void Install()
{
StubInit();
patchInit();
ReplaceAllocRoutines();
RE::MemoryManager::GetSingleton()->RegisterMemoryManager();
RE::BSThreadEvent::InitSDM();
}
}
namespace ScrapHeap
{
void* Allocate(RE::ScrapHeap*, std::size_t a_size, std::size_t a_alignment)
{
return a_size > 0 ?
scalable_aligned_malloc(a_size, a_alignment) :
g_trash;
}
RE::ScrapHeap* Ctor(RE::ScrapHeap* a_this)
{
std::memset(a_this, 0, sizeof(RE::ScrapHeap));
//reinterpret_cast<std::uintptr_t*>(a_this)[0] = REL::ID(285161).address();
reinterpret_cast<std::uintptr_t*>(a_this)[0] = REL::Module::BaseAddr() + 0x17e4168;
return a_this;
}
void Deallocate(RE::ScrapHeap*, void* a_mem)
{
if (a_mem != g_trash)
scalable_aligned_free(a_mem);
}
void WriteHooks()
{
using tuple_t = std::tuple<std::uint64_t, std::size_t, void*>;
const std::array todo{
//tuple_t{ 66884, 0x607, &Allocate },
//tuple_t{ 66885, 0x143, &Deallocate },
//tuple_t{ 66882, 0x12B, &Ctor },
tuple_t{ 0xc3e320, 0x607, &Allocate },
tuple_t{ 0xc3e940, 0x143, &Deallocate },
tuple_t{ 0xc3e1a0, 0x12B, &Ctor },
};
for (const auto& [id, size, func] : todo)
{
//REL::Relocation<std::uintptr_t> target{ REL::ID(id) };
REL::Offset<std::uintptr_t> target = id;
//REL::safe_fill(target.address(), REL::INT3, size);
for (int i = 0; i < size; ++i)
{
SKSE::SafeWrite8(target.GetAddress() + i, 0xCC);
}
asm_jump(target.GetAddress(), size, reinterpret_cast<std::uintptr_t>(func));
}
}
void WriteStubs()
{
using tuple_t = std::tuple<std::uint64_t, std::size_t>;
const std::array todo{
//tuple_t{ 66891, 0xC3 }, // Clean
//tuple_t{ 66890, 0x8 }, // ClearKeepPages
//tuple_t{ 66894, 0xF6 }, // InsertFreeBlock
//tuple_t{ 66895, 0x183 }, // RemoveFreeBlock
//tuple_t{ 66889, 0x4 }, // SetKeepPages
//tuple_t{ 66883, 0x32 }, // dtor
tuple_t{ 0xc3eb00, 0xC3 }, // Clean
tuple_t{ 0xc3eaf0, 0x8 }, // ClearKeepPages
tuple_t{ 0xc3ec30, 0xF6 }, // InsertFreeBlock
tuple_t{ 0xc3ed30, 0x183 }, // RemoveFreeBlock
tuple_t{ 0xc3eaf0, 0x4 }, // SetKeepPages
tuple_t{ 0xc3e2e0, 0x32 }, // dtor
};
for (const auto& [id, size] : todo)
{
// REL::Relocation<std::uintptr_t> target{ REL::ID(id) };
REL::Offset<std::uintptr_t> target = id;
// REL::safe_fill(target.address(), REL::INT3, size);
for (int i = 0; i < size; ++i)
{
SKSE::SafeWrite8(target.GetAddress() + i, 0xCC);
}
//REL::safe_write(target.address(), REL::RET);
SKSE::SafeWrite8(target.GetAddress(), 0xC3);
}
}
void Install()
{
WriteStubs();
WriteHooks();
}
}
}
namespace patches
{
bool PatchMemoryManager()
{
_MESSAGE("-memory manager patch -");
g_trash = new std::byte[1u << 10]{ static_cast<std::byte>(0) };
AutoScrapBuffer::Install();
MemoryManager::Install();
ScrapHeap::Install();
_MESSAGE("success");
return true;
}
}
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