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ARMJIT_Memory.cpp
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/*
Copyright 2016-2024 melonDS team
This file is part of melonDS.
melonDS is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option)
any later version.
melonDS is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with melonDS. If not, see http://www.gnu.org/licenses/.
*/
#if defined(__SWITCH__)
#include <switch.h>
#elif defined(_WIN32)
#include <windows.h>
#else
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <signal.h>
#endif
#if defined(__ANDROID__)
#include <dlfcn.h>
#include <linux/ashmem.h>
#include <sys/ioctl.h>
#endif
#include "ARMJIT.h"
#include "ARMJIT_Memory.h"
#include "ARMJIT_Internal.h"
#include "ARMJIT_Compiler.h"
#include "ARMJIT_Global.h"
#include "DSi.h"
#include "GPU.h"
#include "GPU3D.h"
#include "Wifi.h"
#include "NDSCart.h"
#include "SPU.h"
#include <stdlib.h>
/*
We're handling fastmem here.
Basically we're repurposing a big piece of virtual memory
and map the memory regions as they're structured on the DS
in it.
On most systems you have a single piece of main ram,
maybe some video ram and faster cache RAM and that's about it.
Here we have not only a lot more different memory regions,
but also two address spaces. Not only that but they all have
mirrors (the worst case is 16kb SWRAM which is mirrored 1024x).
We handle this by only mapping those regions which are actually
used and by praying the games don't go wild.
Beware, this file is full of platform specific code and copied
from Dolphin, so enjoy the copied comments!
*/
// Yes I know this looks messy, but better here than somewhere else in the code
#if defined(__x86_64__)
#if defined(_WIN32)
#define CONTEXT_PC Rip
#elif defined(__linux__)
#define CONTEXT_PC uc_mcontext.gregs[REG_RIP]
#elif defined(__APPLE__)
#define CONTEXT_PC uc_mcontext->__ss.__rip
#elif defined(__FreeBSD__)
#define CONTEXT_PC uc_mcontext.mc_rip
#elif defined(__NetBSD__)
#define CONTEXT_PC uc_mcontext.__gregs[_REG_RIP]
#endif
#elif defined(__aarch64__)
#if defined(_WIN32)
#define CONTEXT_PC Pc
#elif defined(__linux__)
#define CONTEXT_PC uc_mcontext.pc
#elif defined(__APPLE__)
#define CONTEXT_PC uc_mcontext->__ss.__pc
#elif defined(__FreeBSD__)
#define CONTEXT_PC uc_mcontext.mc_gpregs.gp_elr
#elif defined(__NetBSD__)
#define CONTEXT_PC uc_mcontext.__gregs[_REG_PC]
#endif
#endif
namespace melonDS
{
static constexpr u64 AddrSpaceSize = 0x100000000;
static constexpr u64 VirtmemAreaSize = AddrSpaceSize * 2 + MemoryTotalSize;
using Platform::Log;
using Platform::LogLevel;
#if defined(__ANDROID__)
#define ASHMEM_DEVICE "/dev/ashmem"
#endif
#if defined(__SWITCH__)
// with LTO the symbols seem to be not properly overriden
// if they're somewhere else
void HandleFault(u64 pc, u64 lr, u64 fp, u64 faultAddr, u32 desc);
extern "C"
{
void ARM_RestoreContext(u64* registers) __attribute__((noreturn));
extern char __start__;
extern char __rodata_start;
alignas(16) u8 __nx_exception_stack[0x8000];
u64 __nx_exception_stack_size = 0x8000;
void __libnx_exception_handler(ThreadExceptionDump* ctx)
{
ARMJIT_Memory::FaultDescription desc;
u8* curArea = (u8*)(NDS::CurCPU == 0 ? ARMJIT_Memory::FastMem9Start : ARMJIT_Memory::FastMem7Start);
desc.EmulatedFaultAddr = (u8*)ctx->far.x - curArea;
desc.FaultPC = (u8*)ctx->pc.x;
u64 integerRegisters[33];
memcpy(integerRegisters, &ctx->cpu_gprs[0].x, 8*29);
integerRegisters[29] = ctx->fp.x;
integerRegisters[30] = ctx->lr.x;
integerRegisters[31] = ctx->sp.x;
integerRegisters[32] = ctx->pc.x;
if (Melon::FaultHandler(desc))
{
integerRegisters[32] = (u64)desc.FaultPC;
ARM_RestoreContext(integerRegisters);
}
HandleFault(ctx->pc.x, ctx->lr.x, ctx->fp.x, ctx->far.x, ctx->error_desc);
}
}
#elif defined(_WIN32)
static LPVOID ExceptionHandlerHandle = nullptr;
static HMODULE KernelBaseDll = nullptr;
using VirtualAlloc2Type = PVOID WINAPI (*)(HANDLE Process, PVOID BaseAddress, SIZE_T Size, ULONG AllocationType, ULONG PageProtection, MEM_EXTENDED_PARAMETER* ExtendedParameters, ULONG ParameterCount);
using MapViewOfFile3Type = PVOID WINAPI (*)(HANDLE FileMapping, HANDLE Process, PVOID BaseAddress, ULONG64 Offset, SIZE_T ViewSize, ULONG AllocationType, ULONG PageProtection, MEM_EXTENDED_PARAMETER* ExtendedParameters, ULONG ParameterCount);
static VirtualAlloc2Type virtualAlloc2Ptr;
static MapViewOfFile3Type mapViewOfFile3Ptr;
LONG ARMJIT_Memory::ExceptionHandler(EXCEPTION_POINTERS* exceptionInfo)
{
if (exceptionInfo->ExceptionRecord->ExceptionCode != EXCEPTION_ACCESS_VIOLATION)
{
return EXCEPTION_CONTINUE_SEARCH;
}
u8* curArea = (u8*)(NDS::Current->CurCPU == 0 ? NDS::Current->JIT.Memory.FastMem9Start : NDS::Current->JIT.Memory.FastMem7Start);
FaultDescription desc {};
desc.EmulatedFaultAddr = (u8*)exceptionInfo->ExceptionRecord->ExceptionInformation[1] - curArea;
desc.FaultPC = (u8*)exceptionInfo->ContextRecord->CONTEXT_PC;
if (FaultHandler(desc, *NDS::Current))
{
exceptionInfo->ContextRecord->CONTEXT_PC = (u64)desc.FaultPC;
return EXCEPTION_CONTINUE_EXECUTION;
}
Log(LogLevel::Debug, "it all returns to nothing\n");
return EXCEPTION_CONTINUE_SEARCH;
}
#else
static struct sigaction OldSaSegv;
static struct sigaction OldSaBus;
void ARMJIT_Memory::SigsegvHandler(int sig, siginfo_t* info, void* rawContext)
{
if (sig != SIGSEGV && sig != SIGBUS)
{
// We are not interested in other signals - handle it as usual.
return;
}
if (info->si_code != SEGV_MAPERR && info->si_code != SEGV_ACCERR)
{
// Huh? Return.
return;
}
ucontext_t* context = (ucontext_t*)rawContext;
FaultDescription desc {};
u8* curArea = (u8*)(NDS::Current->CurCPU == 0 ? NDS::Current->JIT.Memory.FastMem9Start : NDS::Current->JIT.Memory.FastMem7Start);
desc.EmulatedFaultAddr = (u8*)info->si_addr - curArea;
desc.FaultPC = (u8*)context->CONTEXT_PC;
if (FaultHandler(desc, *NDS::Current))
{
context->CONTEXT_PC = (u64)desc.FaultPC;
return;
}
struct sigaction* oldSa;
if (sig == SIGSEGV)
oldSa = &OldSaSegv;
else
oldSa = &OldSaBus;
if (oldSa->sa_flags & SA_SIGINFO)
{
oldSa->sa_sigaction(sig, info, rawContext);
return;
}
if (oldSa->sa_handler == SIG_DFL)
{
signal(sig, SIG_DFL);
return;
}
if (oldSa->sa_handler == SIG_IGN)
{
// Ignore signal
return;
}
oldSa->sa_handler(sig);
}
#endif
const u32 OffsetsPerRegion[ARMJIT_Memory::memregions_Count] =
{
UINT32_MAX,
UINT32_MAX,
MemBlockDTCMOffset,
UINT32_MAX,
MemBlockMainRAMOffset,
MemBlockSWRAMOffset,
UINT32_MAX,
UINT32_MAX,
UINT32_MAX,
MemBlockARM7WRAMOffset,
UINT32_MAX,
UINT32_MAX,
UINT32_MAX,
UINT32_MAX,
UINT32_MAX,
MemBlockNWRAM_AOffset,
MemBlockNWRAM_BOffset,
MemBlockNWRAM_COffset
};
enum
{
memstate_Unmapped,
memstate_MappedRW,
// on Switch this is unmapped as well
memstate_MappedProtected,
};
#define CHECK_ALIGNED(value) assert(((value) & (PageSize-1)) == 0)
bool ARMJIT_Memory::MapIntoRange(u32 addr, u32 num, u32 offset, u32 size) noexcept
{
CHECK_ALIGNED(addr);
CHECK_ALIGNED(offset);
CHECK_ALIGNED(size);
u8* dst = (u8*)(num == 0 ? FastMem9Start : FastMem7Start) + addr;
#ifdef __SWITCH__
Result r = (svcMapProcessMemory(dst, envGetOwnProcessHandle(),
(u64)(MemoryBaseCodeMem + offset), size));
return R_SUCCEEDED(r);
#elif defined(_WIN32)
uintptr_t uintptrDst = reinterpret_cast<uintptr_t>(dst);
for (auto it = VirtmemPlaceholders.begin(); it != VirtmemPlaceholders.end(); it++)
{
if (uintptrDst >= it->Start && uintptrDst+size <= it->Start+it->Size)
{
//Log(LogLevel::Debug, "found mapping %llx %llx %llx %llx\n", uintptrDst, size, it->Start, it->Size);
// we split this place holder so that we have a fitting place holder for the mapping
if (uintptrDst != it->Start || size != it->Size)
{
if (!VirtualFree(dst, size, MEM_RELEASE|MEM_PRESERVE_PLACEHOLDER))
{
Log(LogLevel::Debug, "VirtualFree failed with %x\n", GetLastError());
return false;
}
}
VirtmemPlaceholder splitPlaceholder = *it;
VirtmemPlaceholders.erase(it);
if (uintptrDst > splitPlaceholder.Start)
{
//Log(LogLevel::Debug, "splitting on the left %llx\n", uintptrDst - splitPlaceholder.Start);
VirtmemPlaceholders.push_back({splitPlaceholder.Start, uintptrDst - splitPlaceholder.Start});
}
if (uintptrDst+size < splitPlaceholder.Start+splitPlaceholder.Size)
{
//Log(LogLevel::Debug, "splitting on the right %llx\n", (splitPlaceholder.Start+splitPlaceholder.Size)-(uintptrDst+size));
VirtmemPlaceholders.push_back({uintptrDst+size, (splitPlaceholder.Start+splitPlaceholder.Size)-(uintptrDst+size)});
}
if (!mapViewOfFile3Ptr(MemoryFile, nullptr, dst, offset, size, MEM_REPLACE_PLACEHOLDER, PAGE_READWRITE, nullptr, 0))
{
Log(LogLevel::Debug, "MapViewOfFile3 failed with %x\n", GetLastError());
return false;
}
return true;
}
}
Log(LogLevel::Debug, "no mapping at all found??? %p %x %p\n", dst, size, MemoryBase);
return false;
#else
return mmap(dst, size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, MemoryFile, offset) != MAP_FAILED;
#endif
}
bool ARMJIT_Memory::UnmapFromRange(u32 addr, u32 num, u32 offset, u32 size) noexcept
{
CHECK_ALIGNED(addr);
CHECK_ALIGNED(offset);
CHECK_ALIGNED(size);
u8* dst = (u8*)(num == 0 ? FastMem9Start : FastMem7Start) + addr;
#ifdef __SWITCH__
Result r = svcUnmapProcessMemory(dst, envGetOwnProcessHandle(),
(u64)(MemoryBaseCodeMem + offset), size);
return R_SUCCEEDED(r);
#elif defined(_WIN32)
if (!UnmapViewOfFileEx(dst, MEM_PRESERVE_PLACEHOLDER))
{
Log(LogLevel::Debug, "UnmapViewOfFileEx failed %x\n", GetLastError());
return false;
}
uintptr_t uintptrDst = reinterpret_cast<uintptr_t>(dst);
uintptr_t coalesceStart = uintptrDst;
size_t coalesceSize = size;
for (auto it = VirtmemPlaceholders.begin(); it != VirtmemPlaceholders.end();)
{
if (it->Start+it->Size == uintptrDst)
{
//Log(LogLevel::Debug, "Coalescing to the left\n");
coalesceStart = it->Start;
coalesceSize += it->Size;
it = VirtmemPlaceholders.erase(it);
}
else if (it->Start == uintptrDst+size)
{
//Log(LogLevel::Debug, "Coalescing to the right\n");
coalesceSize += it->Size;
it = VirtmemPlaceholders.erase(it);
}
else
{
it++;
}
}
if (coalesceStart != uintptrDst || coalesceSize != size)
{
if (!VirtualFree(reinterpret_cast<void*>(coalesceStart), coalesceSize, MEM_RELEASE|MEM_COALESCE_PLACEHOLDERS))
return false;
}
VirtmemPlaceholders.push_back({coalesceStart, coalesceSize});
//Log(LogLevel::Debug, "Adding coalesced region %llx %llx", coalesceStart, coalesceSize);
return true;
#else
return mmap(dst, size, PROT_NONE, MAP_ANON | MAP_PRIVATE | MAP_FIXED, -1, 0) != MAP_FAILED;
#endif
}
#ifndef __SWITCH__
void ARMJIT_Memory::SetCodeProtectionRange(u32 addr, u32 size, u32 num, int protection) noexcept
{
CHECK_ALIGNED(addr);
CHECK_ALIGNED(size);
u8* dst = (u8*)(num == 0 ? FastMem9Start : FastMem7Start) + addr;
#if defined(_WIN32)
DWORD winProtection, oldProtection;
if (protection == 0)
winProtection = PAGE_NOACCESS;
else if (protection == 1)
winProtection = PAGE_READONLY;
else
winProtection = PAGE_READWRITE;
bool success = VirtualProtect(dst, size, winProtection, &oldProtection);
if (!success)
{
Log(LogLevel::Debug, "VirtualProtect failed with %x\n", GetLastError());
}
assert(success);
#else
int posixProt;
if (protection == 0)
posixProt = PROT_NONE;
else if (protection == 1)
posixProt = PROT_READ;
else
posixProt = PROT_READ | PROT_WRITE;
mprotect(dst, size, posixProt);
#endif
}
#endif
void ARMJIT_Memory::Mapping::Unmap(int region, melonDS::NDS& nds) noexcept
{
u32 dtcmStart = nds.ARM9.DTCMBase;
u32 dtcmSize = ~nds.ARM9.DTCMMask + 1;
bool skipDTCM = Num == 0 && region != memregion_DTCM;
u8* statuses = Num == 0 ? nds.JIT.Memory.MappingStatus9 : nds.JIT.Memory.MappingStatus7;
u32 offset = 0;
while (offset < Size)
{
if (skipDTCM && Addr + offset == dtcmStart)
{
offset += dtcmSize;
}
else
{
u32 segmentOffset = offset;
u8 status = statuses[(Addr + offset) >> PageShift];
while (statuses[(Addr + offset) >> PageShift] == status
&& offset < Size
&& (!skipDTCM || Addr + offset != dtcmStart))
{
assert(statuses[(Addr + offset) >> PageShift] != memstate_Unmapped);
statuses[(Addr + offset) >> PageShift] = memstate_Unmapped;
offset += PageSize;
}
#ifdef __SWITCH__
if (status == memstate_MappedRW)
{
u32 segmentSize = offset - segmentOffset;
Log(LogLevel::Debug, "unmapping %x %x %x %x\n", Addr + segmentOffset, Num, segmentOffset + LocalOffset + OffsetsPerRegion[region], segmentSize);
bool success = memory.UnmapFromRange(Addr + segmentOffset, Num, segmentOffset + LocalOffset + OffsetsPerRegion[region], segmentSize);
assert(success);
}
#endif
}
}
#ifndef __SWITCH__
u32 dtcmEnd = dtcmStart + dtcmSize;
if (Num == 0
&& dtcmEnd >= Addr
&& dtcmStart < Addr + Size)
{
bool success;
if (dtcmStart > Addr)
{
success = nds.JIT.Memory.UnmapFromRange(Addr, 0, OffsetsPerRegion[region] + LocalOffset, dtcmStart - Addr);
assert(success);
}
if (dtcmEnd < Addr + Size)
{
u32 offset = dtcmStart - Addr + dtcmSize;
success = nds.JIT.Memory.UnmapFromRange(dtcmEnd, 0, OffsetsPerRegion[region] + LocalOffset + offset, Size - offset);
assert(success);
}
}
else
{
bool succeded = nds.JIT.Memory.UnmapFromRange(Addr, Num, OffsetsPerRegion[region] + LocalOffset, Size);
assert(succeded);
}
#endif
}
void ARMJIT_Memory::SetCodeProtection(int region, u32 offset, bool protect) noexcept
{
offset &= ~(PageSize - 1);
//printf("set code protection %d %x %d\n", region, offset, protect);
for (int i = 0; i < Mappings[region].Length; i++)
{
Mapping& mapping = Mappings[region][i];
if (offset < mapping.LocalOffset || offset >= mapping.LocalOffset + mapping.Size)
continue;
u32 effectiveAddr = mapping.Addr + (offset - mapping.LocalOffset);
if (mapping.Num == 0
&& region != memregion_DTCM
&& (effectiveAddr & NDS.ARM9.DTCMMask) == NDS.ARM9.DTCMBase)
continue;
u8* states = (u8*)(mapping.Num == 0 ? MappingStatus9 : MappingStatus7);
//printf("%x %d %x %x %x %d\n", effectiveAddr, mapping.Num, mapping.Addr, mapping.LocalOffset, mapping.Size, states[effectiveAddr >> PageShift]);
assert(states[effectiveAddr >> PageShift] == (protect ? memstate_MappedRW : memstate_MappedProtected));
states[effectiveAddr >> PageShift] = protect ? memstate_MappedProtected : memstate_MappedRW;
#if defined(__SWITCH__)
bool success;
if (protect)
success = UnmapFromRange(effectiveAddr, mapping.Num, OffsetsPerRegion[region] + offset, 0x1000);
else
success = MapIntoRange(effectiveAddr, mapping.Num, OffsetsPerRegion[region] + offset, 0x1000);
assert(success);
#else
SetCodeProtectionRange(effectiveAddr, PageSize, mapping.Num, protect ? 1 : 2);
#endif
}
}
void ARMJIT_Memory::RemapDTCM(u32 newBase, u32 newSize) noexcept
{
// this first part could be made more efficient
// by unmapping DTCM first and then map the holes
u32 oldDTCMBase = NDS.ARM9.DTCMBase;
u32 oldDTCMSize = ~NDS.ARM9.DTCMMask + 1;
u32 oldDTCMEnd = oldDTCMBase + NDS.ARM9.DTCMMask;
u32 newEnd = newBase + newSize;
Log(LogLevel::Debug, "remapping DTCM %x %x %x %x\n", newBase, newEnd, oldDTCMBase, oldDTCMEnd);
// unmap all regions containing the old or the current DTCM mapping
for (int region = 0; region < memregions_Count; region++)
{
if (region == memregion_DTCM)
continue;
for (int i = 0; i < Mappings[region].Length;)
{
Mapping& mapping = Mappings[region][i];
u32 start = mapping.Addr;
u32 end = mapping.Addr + mapping.Size;
Log(LogLevel::Debug, "unmapping %d %x %x %x %x\n", region, mapping.Addr, mapping.Size, mapping.Num, mapping.LocalOffset);
bool overlap = (oldDTCMSize > 0 && oldDTCMBase < end && oldDTCMEnd > start)
|| (newSize > 0 && newBase < end && newEnd > start);
if (mapping.Num == 0 && overlap)
{
mapping.Unmap(region, NDS);
Mappings[region].Remove(i);
}
else
{
i++;
}
}
}
for (int i = 0; i < Mappings[memregion_DTCM].Length; i++)
{
Mappings[memregion_DTCM][i].Unmap(memregion_DTCM, NDS);
}
Mappings[memregion_DTCM].Clear();
}
void ARMJIT_Memory::RemapNWRAM(int num) noexcept
{
if (NDS.ConsoleType == 0)
return;
auto* dsi = static_cast<DSi*>(&NDS);
for (int i = 0; i < Mappings[memregion_SharedWRAM].Length;)
{
Mapping& mapping = Mappings[memregion_SharedWRAM][i];
if (dsi->NWRAMStart[mapping.Num][num] < mapping.Addr + mapping.Size
&& dsi->NWRAMEnd[mapping.Num][num] > mapping.Addr)
{
mapping.Unmap(memregion_SharedWRAM, NDS);
Mappings[memregion_SharedWRAM].Remove(i);
}
else
{
i++;
}
}
for (int i = 0; i < Mappings[memregion_NewSharedWRAM_A + num].Length; i++)
{
Mappings[memregion_NewSharedWRAM_A + num][i].Unmap(memregion_NewSharedWRAM_A + num, NDS);
}
Mappings[memregion_NewSharedWRAM_A + num].Clear();
}
void ARMJIT_Memory::RemapSWRAM() noexcept
{
Log(LogLevel::Debug, "remapping SWRAM\n");
for (int i = 0; i < Mappings[memregion_WRAM7].Length;)
{
Mapping& mapping = Mappings[memregion_WRAM7][i];
if (mapping.Addr + mapping.Size <= 0x03800000)
{
mapping.Unmap(memregion_WRAM7, NDS);
Mappings[memregion_WRAM7].Remove(i);
}
else
i++;
}
for (int i = 0; i < Mappings[memregion_SharedWRAM].Length; i++)
{
Mappings[memregion_SharedWRAM][i].Unmap(memregion_SharedWRAM, NDS);
}
Mappings[memregion_SharedWRAM].Clear();
}
bool ARMJIT_Memory::MapAtAddress(u32 addr) noexcept
{
u32 num = NDS.CurCPU;
int region = num == 0
? ClassifyAddress9(addr)
: ClassifyAddress7(addr);
if (!IsFastmemCompatible(region))
return false;
u32 mirrorStart, mirrorSize, memoryOffset;
bool isMapped = GetMirrorLocation(region, num, addr, memoryOffset, mirrorStart, mirrorSize);
if (!isMapped)
return false;
u8* states = num == 0 ? MappingStatus9 : MappingStatus7;
//printf("mapping mirror %x, %x %x %d %d\n", mirrorStart, mirrorSize, memoryOffset, region, num);
bool isExecutable = NDS.JIT.CodeMemRegions[region];
u32 dtcmStart = NDS.ARM9.DTCMBase;
u32 dtcmSize = ~NDS.ARM9.DTCMMask + 1;
u32 dtcmEnd = dtcmStart + dtcmSize;
#ifndef __SWITCH__
if (num == 0
&& dtcmEnd >= mirrorStart
&& dtcmStart < mirrorStart + mirrorSize)
{
if (dtcmSize < PageSize)
{
// we could technically mask out the DTCM by setting a hole to access permissions
// but realistically there isn't much of a point in mapping less than 16kb of DTCM
// so it isn't worth more complex support
Log(LogLevel::Info, "DTCM size smaller than 16kb skipping mapping entirely");
return false;
}
bool success;
if (dtcmStart > mirrorStart)
{
success = MapIntoRange(mirrorStart, 0, OffsetsPerRegion[region] + memoryOffset, dtcmStart - mirrorStart);
assert(success);
}
if (dtcmEnd < mirrorStart + mirrorSize)
{
u32 offset = dtcmStart - mirrorStart + dtcmSize;
success = MapIntoRange(dtcmEnd, 0, OffsetsPerRegion[region] + memoryOffset + offset, mirrorSize - offset);
assert(success);
}
}
else
{
bool succeded = MapIntoRange(mirrorStart, num, OffsetsPerRegion[region] + memoryOffset, mirrorSize);
assert(succeded);
}
#endif
AddressRange* range = NDS.JIT.CodeMemRegions[region] + memoryOffset / 512;
// this overcomplicated piece of code basically just finds whole pieces of code memory
// which can be mapped/protected
u32 offset = 0;
bool skipDTCM = num == 0 && region != memregion_DTCM;
while (offset < mirrorSize)
{
if (skipDTCM && mirrorStart + offset == dtcmStart)
{
offset += dtcmSize;
}
else
{
u32 sectionOffset = offset;
bool hasCode = isExecutable && PageContainsCode(&range[offset / 512], PageSize);
while (offset < mirrorSize
&& (!isExecutable || PageContainsCode(&range[offset / 512], PageSize) == hasCode)
&& (!skipDTCM || mirrorStart + offset != NDS.ARM9.DTCMBase))
{
assert(states[(mirrorStart + offset) >> PageShift] == memstate_Unmapped);
states[(mirrorStart + offset) >> PageShift] = hasCode ? memstate_MappedProtected : memstate_MappedRW;
offset += PageSize;
}
u32 sectionSize = offset - sectionOffset;
#if defined(__SWITCH__)
if (!hasCode)
{
//printf("trying to map %x (size: %x) from %x\n", mirrorStart + sectionOffset, sectionSize, sectionOffset + memoryOffset + OffsetsPerRegion[region]);
bool succeded = MapIntoRange(mirrorStart + sectionOffset, num, sectionOffset + memoryOffset + OffsetsPerRegion[region], sectionSize);
assert(succeded);
}
#else
if (hasCode)
{
SetCodeProtectionRange(mirrorStart + sectionOffset, sectionSize, num, 1);
}
#endif
}
}
assert(num == 0 || num == 1);
Mapping mapping{mirrorStart, mirrorSize, memoryOffset, num};
Mappings[region].Add(mapping);
//printf("mapped mirror at %08x-%08x\n", mirrorStart, mirrorStart + mirrorSize - 1);
return true;
}
u32 ARMJIT_Memory::PageSize = 0;
u32 ARMJIT_Memory::PageShift = 0;
bool ARMJIT_Memory::IsFastMemSupported()
{
#ifdef __APPLE__
return false;
#else
static bool initialised = false;
static bool isSupported = false;
if (!initialised)
{
#ifdef _WIN32
ARMJIT_Global::Init();
isSupported = virtualAlloc2Ptr != nullptr;
ARMJIT_Global::DeInit();
PageSize = RegularPageSize;
#else
PageSize = __sysconf(_SC_PAGESIZE);
isSupported = PageSize == RegularPageSize || PageSize == LargePageSize;
#endif
PageShift = __builtin_ctz(PageSize);
initialised = true;
}
return isSupported;
#endif
}
void ARMJIT_Memory::RegisterFaultHandler()
{
#ifdef _WIN32
ExceptionHandlerHandle = AddVectoredExceptionHandler(1, ExceptionHandler);
KernelBaseDll = LoadLibrary("KernelBase.dll");
if (KernelBaseDll)
{
virtualAlloc2Ptr = reinterpret_cast<VirtualAlloc2Type>(GetProcAddress(KernelBaseDll, "VirtualAlloc2"));
mapViewOfFile3Ptr = reinterpret_cast<MapViewOfFile3Type>(GetProcAddress(KernelBaseDll, "MapViewOfFile3"));
}
if (!virtualAlloc2Ptr)
{
Log(LogLevel::Error, "Could not load new Windows virtual memory functions, fast memory is disabled.\n");
}
#else
struct sigaction sa;
sa.sa_handler = nullptr;
sa.sa_sigaction = &SigsegvHandler;
sa.sa_flags = SA_SIGINFO;
sigemptyset(&sa.sa_mask);
sigaction(SIGSEGV, &sa, &OldSaSegv);
#ifdef __APPLE__
sigaction(SIGBUS, &sa, &OldSaBus);
#endif
#endif
}
void ARMJIT_Memory::UnregisterFaultHandler()
{
#ifdef _WIN32
if (ExceptionHandlerHandle)
{
RemoveVectoredExceptionHandler(ExceptionHandlerHandle);
ExceptionHandlerHandle = nullptr;
}
if (KernelBaseDll)
{
FreeLibrary(KernelBaseDll);
KernelBaseDll = nullptr;
}
#else
sigaction(SIGSEGV, &OldSaSegv, nullptr);
#ifdef __APPLE__
sigaction(SIGBUS, &OldSaBus, nullptr);
#endif
#endif
}
bool ARMJIT_Memory::FaultHandler(FaultDescription& faultDesc, melonDS::NDS& nds)
{
if (nds.JIT.JITCompiler.IsJITFault(faultDesc.FaultPC))
{
bool rewriteToSlowPath = true;
u8* memStatus = nds.CurCPU == 0 ? nds.JIT.Memory.MappingStatus9 : nds.JIT.Memory.MappingStatus7;
if (memStatus[faultDesc.EmulatedFaultAddr >> PageShift] == memstate_Unmapped)
rewriteToSlowPath = !nds.JIT.Memory.MapAtAddress(faultDesc.EmulatedFaultAddr);
if (rewriteToSlowPath)
faultDesc.FaultPC = nds.JIT.JITCompiler.RewriteMemAccess(faultDesc.FaultPC);
return true;
}
return false;
}
ARMJIT_Memory::ARMJIT_Memory(melonDS::NDS& nds) : NDS(nds)
{
ARMJIT_Global::Init();
#if defined(__SWITCH__)
MemoryBase = (u8*)aligned_alloc(0x1000, MemoryTotalSize);
virtmemLock();
MemoryBaseCodeMem = (u8*)virtmemFindCodeMemory(MemoryTotalSize, 0x1000);
bool succeded = R_SUCCEEDED(svcMapProcessCodeMemory(envGetOwnProcessHandle(), (u64)MemoryBaseCodeMem,
(u64)MemoryBase, MemoryTotalSize));
assert(succeded);
succeded = R_SUCCEEDED(svcSetProcessMemoryPermission(envGetOwnProcessHandle(), (u64)MemoryBaseCodeMem,
MemoryTotalSize, Perm_Rw));
assert(succeded);
// 8 GB of address space, just don't ask...
FastMem9Start = virtmemFindAslr(AddrSpaceSize, 0x1000);
assert(FastMem9Start);
FastMem7Start = virtmemFindAslr(AddrSpaceSize, 0x1000);
assert(FastMem7Start);
FastMem9Reservation = virtmemAddReservation(FastMem9Start, AddrSpaceSize);
FastMem7Reservation = virtmemAddReservation(FastMem7Start, AddrSpaceSize);
virtmemUnlock();
u8* basePtr = MemoryBaseCodeMem;
#elif defined(_WIN32)
if (virtualAlloc2Ptr)
{
MemoryFile = CreateFileMapping(INVALID_HANDLE_VALUE, nullptr, PAGE_READWRITE, 0, MemoryTotalSize, nullptr);
MemoryBase = reinterpret_cast<u8*>(virtualAlloc2Ptr(nullptr, nullptr, VirtmemAreaSize,
MEM_RESERVE | MEM_RESERVE_PLACEHOLDER,
PAGE_NOACCESS,
nullptr, 0));
// split off placeholder and map base mapping
VirtualFree(MemoryBase, MemoryTotalSize, MEM_RELEASE|MEM_PRESERVE_PLACEHOLDER);
mapViewOfFile3Ptr(MemoryFile, nullptr, MemoryBase, 0, MemoryTotalSize, MEM_REPLACE_PLACEHOLDER, PAGE_READWRITE, nullptr, 0);
VirtmemPlaceholders.push_back({reinterpret_cast<uintptr_t>(MemoryBase)+MemoryTotalSize, AddrSpaceSize*2});
}
else
{
// old Windows version
MemoryBase = new u8[MemoryTotalSize];
}
#else
MemoryBase = (u8*)mmap(nullptr, VirtmemAreaSize, PROT_NONE, MAP_ANON | MAP_PRIVATE, -1, 0);
#if defined(__ANDROID__)
Libandroid = Platform::DynamicLibrary_Load("libandroid.so");
using type_ASharedMemory_create = int(*)(const char* name, size_t size);
auto ASharedMemory_create = reinterpret_cast<type_ASharedMemory_create>(Platform::DynamicLibrary_LoadFunction(Libandroid, "ASharedMemory_create"));
if (ASharedMemory_create)
{
MemoryFile = ASharedMemory_create("melondsfastmem", MemoryTotalSize);
}
else
{
int fd = open(ASHMEM_DEVICE, O_RDWR);
ioctl(fd, ASHMEM_SET_NAME, "melondsfastmem");
ioctl(fd, ASHMEM_SET_SIZE, MemoryTotalSize);
MemoryFile = fd;
}
#else
char fastmemPidName[snprintf(NULL, 0, "/melondsfastmem%d", getpid()) + 1];
snprintf(fastmemPidName, sizeof(fastmemPidName), "/melondsfastmem%d", getpid());
MemoryFile = shm_open(fastmemPidName, O_RDWR | O_CREAT | O_EXCL, 0600);
if (MemoryFile == -1)
{
Log(LogLevel::Error, "Failed to open memory using shm_open! (%s)", strerror(errno));
}
shm_unlink(fastmemPidName);
#endif
if (ftruncate(MemoryFile, MemoryTotalSize) < 0)
{
Log(LogLevel::Error, "Failed to allocate memory using ftruncate! (%s)", strerror(errno));
}
mmap(MemoryBase, MemoryTotalSize, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, MemoryFile, 0);
#endif
FastMem9Start = MemoryBase+MemoryTotalSize;
FastMem7Start = static_cast<u8*>(FastMem9Start)+AddrSpaceSize;
}
ARMJIT_Memory::~ARMJIT_Memory() noexcept
{
#if defined(__SWITCH__)
virtmemLock();
if (FastMem9Reservation)
virtmemRemoveReservation(FastMem9Reservation);
if (FastMem7Reservation)
virtmemRemoveReservation(FastMem7Reservation);
FastMem9Reservation = nullptr;
FastMem7Reservation = nullptr;
virtmemUnlock();
svcUnmapProcessCodeMemory(envGetOwnProcessHandle(), (u64)MemoryBaseCodeMem, (u64)MemoryBase, MemoryTotalSize);
free(MemoryBase);
MemoryBase = nullptr;
#elif defined(_WIN32)
if (virtualAlloc2Ptr)
{
if (MemoryBase)
{
bool viewUnmapped = UnmapViewOfFileEx(MemoryBase, MEM_PRESERVE_PLACEHOLDER);
assert(viewUnmapped);
bool viewCoalesced = VirtualFree(MemoryBase, VirtmemAreaSize, MEM_RELEASE|MEM_COALESCE_PLACEHOLDERS);
assert(viewCoalesced);
bool freeEverything = VirtualFree(MemoryBase, 0, MEM_RELEASE);
assert(freeEverything);
MemoryBase = nullptr;
FastMem9Start = nullptr;
FastMem7Start = nullptr;
}
if (MemoryFile)
{
CloseHandle(MemoryFile);
MemoryFile = INVALID_HANDLE_VALUE;
}
}
else
{
delete[] MemoryBase;
}
#else
if (MemoryBase)
{
munmap(MemoryBase, VirtmemAreaSize);
MemoryBase = nullptr;
FastMem9Start = nullptr;
FastMem7Start = nullptr;
}
if (MemoryFile >= 0)
{
close(MemoryFile);
MemoryFile = -1;
}
Log(LogLevel::Info, "unmappinged everything\n");
#if defined(__ANDROID__)
if (Libandroid)
{
Platform::DynamicLibrary_Unload(Libandroid);
Libandroid = nullptr;
}
#endif
#endif
ARMJIT_Global::DeInit();
}
void ARMJIT_Memory::Reset() noexcept
{
for (int region = 0; region < memregions_Count; region++)
{
for (int i = 0; i < Mappings[region].Length; i++)