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ppsspp/Core/MIPS/ARM/ArmJit.h
T
Henrik RydgårdandClaude Opus 5.5 6d122f416e Keep JIT block entries and replacement hooks out of PSP memory 
The JITs used to find a block by overwriting its first instruction with an "emuhack" holding
the offset into the code space, and replacement functions installed their own emuhack the same
way. Anything that read code (savestates, the debugger, memory dumps, cheats, the function
hasher, games reading their own code) had to translate them back.

Blocks now live in a block shadow: one u32 per guest instruction, indexed by the PC masked with
BLOCK_SHADOW_MASK (1GB on 64-bit, folding the kernel and uncached mirrors; 256MB on 32-bit, iOS
and Switch, where address space is short), with the low bits cleared so a misaligned PC can't
read across two entries. Only the ranges under memory views are committed, so a bad PC still
faults in the dispatcher, and the shadow is reserved before the memory map so it can't land in
a gap of the 4GB window. Entries hold full 32-bit offsets, lifting the 16MB limit. The
dispatchers on every backend, and the IR interpreter's loop, look blocks up there.

A hooked instruction without a compiled block gets the JIT's hook value in its entry: the offset
of the dispatcher's compile path (1 for the interpreters, the IR arena keeping that offset
empty), so dispatching there compiles a block, and the frontends substitute the hook. Compiling
replaces the entry with the block's, and destroying the block puts the hook value back. The hook
value is rewritten when the JIT changes or regenerates its dispatcher.

Hooks live in a map keyed by the masked address, and are dropped when the game overwrites the
hooked instruction, or when an icache invalidation finds the function's hash (immediates masked,
as when matching it) changed. Those checks run when queued invalidations are processed, since
cheats and the debugger queue them before writing. Installing and removing hooks invalidates
deferred, as it happens in HLE calls that can run inside a block. The cache instruction goes
through MIPSState, so it drops changed hooks too.

With clean memory, the save/clear/restore around savestates, memory reads and dumps goes away,
as do the source-range invalidations in the memcpy replacements, sceDmac and the cheats.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
2026-10-11 10:33:30 +02:00

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// Copyright (c) 2012- PPSSPP Project.
// This program 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, version 2.0 or later versions.
// This program 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 2.0 for more details.
// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/
// Official git repository and contact information can be found at
// https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.
#pragma once
#include "Common/CPUDetect.h"
#include "Common/ArmCommon.h"
#include "Common/ArmEmitter.h"
#include "Core/MIPS/JitCommon/JitState.h"
#include "Core/MIPS/JitCommon/JitBlockCache.h"
#include "Core/MIPS/JitCommon/JitCommon.h"
#include "Core/MIPS/ARM/ArmRegCache.h"
#include "Core/MIPS/ARM/ArmRegCacheFPU.h"
#include "Core/MIPS/MIPSVFPUUtils.h"
#ifndef offsetof
#include "stddef.h"
#endif
namespace MIPSComp {
class ArmJit : public ArmGen::ARMXCodeBlock, public JitInterface, public MIPSFrontendInterface {
public:
ArmJit(MIPSState *mipsState);
virtual ~ArmJit();
void DoState(PointerWrap &p) override;
const JitOptions &GetJitOptions() { return jo; }
// Compiled ops should ignore delay slots
// the compiler will take care of them by itself
// OR NOT
void Comp_Generic(MIPSOpcode op) override;
void RunLoopUntil(u64 globalticks) override;
void Compile(u32 em_address) override; // Compiles a block at current MIPS PC
const u8 *GetCrashHandler() const override { return crashHandler; }
bool CodeInRange(const u8 *ptr) const override { return IsInSpace(ptr); }
bool DescribeCodePtr(const u8 *ptr, std::string &name) override;
void Comp_ReplacementFunc(MIPSOpcode op) override;
// Ops
void Comp_ITypeMem(MIPSOpcode op) override;
void Comp_StoreSync(MIPSOpcode op) override;
void Comp_Cache(MIPSOpcode op) override;
void Comp_RelBranch(MIPSOpcode op) override;
void Comp_RelBranchRI(MIPSOpcode op) override;
void Comp_FPUBranch(MIPSOpcode op) override;
void Comp_FPULS(MIPSOpcode op) override;
void Comp_FPUComp(MIPSOpcode op) override;
void Comp_Jump(MIPSOpcode op) override;
void Comp_JumpReg(MIPSOpcode op) override;
void Comp_Syscall(MIPSOpcode op) override;
void Comp_Break(MIPSOpcode op) override;
void Comp_IType(MIPSOpcode op) override;
void Comp_RType2(MIPSOpcode op) override;
void Comp_RType3(MIPSOpcode op) override;
void Comp_ShiftType(MIPSOpcode op) override;
void Comp_Allegrex(MIPSOpcode op) override;
void Comp_Allegrex2(MIPSOpcode op) override;
void Comp_VBranch(MIPSOpcode op) override;
void Comp_MulDivType(MIPSOpcode op) override;
void Comp_Special3(MIPSOpcode op) override;
void Comp_FPU3op(MIPSOpcode op) override;
void Comp_FPU2op(MIPSOpcode op) override;
void Comp_mxc1(MIPSOpcode op) override;
void Comp_DoNothing(MIPSOpcode op) override;
void Comp_SV(MIPSOpcode op) override;
void Comp_SVQ(MIPSOpcode op) override;
void Comp_VPFX(MIPSOpcode op) override;
void Comp_VVectorInit(MIPSOpcode op) override;
void Comp_VMatrixInit(MIPSOpcode op) override;
void Comp_VDot(MIPSOpcode op) override;
void Comp_VecDo3(MIPSOpcode op) override;
void Comp_VV2Op(MIPSOpcode op) override;
void Comp_Mftv(MIPSOpcode op) override;
void Comp_Vmfvc(MIPSOpcode op) override;
void Comp_Vmtvc(MIPSOpcode op) override;
void Comp_Vmmov(MIPSOpcode op) override;
void Comp_VScl(MIPSOpcode op) override;
void Comp_Vmmul(MIPSOpcode op) override;
void Comp_Vmscl(MIPSOpcode op) override;
void Comp_Vtfm(MIPSOpcode op) override;
void Comp_VHdp(MIPSOpcode op) override;
void Comp_VCrs(MIPSOpcode op) override;
void Comp_VDet(MIPSOpcode op) override;
void Comp_Vi2x(MIPSOpcode op) override;
void Comp_Vx2i(MIPSOpcode op) override;
void Comp_Vf2i(MIPSOpcode op) override;
void Comp_Vi2f(MIPSOpcode op) override;
void Comp_Vh2f(MIPSOpcode op) override;
void Comp_Vcst(MIPSOpcode op) override;
void Comp_Vhoriz(MIPSOpcode op) override;
void Comp_VRot(MIPSOpcode op) override;
void Comp_VIdt(MIPSOpcode op) override;
void Comp_Vcmp(MIPSOpcode op) override;
void Comp_Vcmov(MIPSOpcode op) override;
void Comp_Viim(MIPSOpcode op) override;
void Comp_Vfim(MIPSOpcode op) override;
void Comp_VCrossQuat(MIPSOpcode op) override;
void Comp_Vsgn(MIPSOpcode op) override;
void Comp_Vocp(MIPSOpcode op) override;
void Comp_ColorConv(MIPSOpcode op) override;
void Comp_Vbfy(MIPSOpcode op) override;
int Replace_fabsf() override;
JitBlockCache *GetBlockCache() override { return &blocks; }
JitBlockCacheDebugInterface *GetBlockCacheDebugInterface() override { return &blocks; }
void ClearCache() override;
void InvalidateCacheAt(u32 em_address, int length = 4) override;
void UpdateFCR31() override;
void EatPrefix() override { js.EatPrefix(); }
const u8 *GetDispatcher() const override {
return dispatcher;
}
u32 GetBlockShadowHookValue() const override {
return (u32)(blockShadowHook - GetBasePtr());
}
bool IsAtDispatchFetch(const u8 *ptr) const override {
return ptr == dispatcherFetch;
}
void LinkBlock(u8 *exitPoint, const u8 *checkedEntry) override;
void UnlinkBlock(u8 *checkedEntry, u32 originalAddress) override;
const u8 *GetCodeBase() const override { return GetCodePtr(); }
private:
void DoJit(u32 em_address, JitBlock *b);
void GenerateFixedCode();
void FlushAll();
void FlushPrefixV();
u32 GetCompilerPC();
void CompileDelaySlot(int flags);
void EatInstruction(MIPSOpcode op);
MIPSOpcode GetOffsetInstruction(int offset);
void WriteDownCount(int offset = 0);
void WriteDownCountR(ArmGen::ARMReg reg);
void RestoreRoundingMode(bool force = false);
void ApplyRoundingMode(bool force = false);
void UpdateRoundingMode(u32 fcr31 = -1);
void MovFromPC(ArmGen::ARMReg r);
void MovToPC(ArmGen::ARMReg r);
void SaveDowncount();
void RestoreDowncount();
void WriteExit(u32 destination, int exit_num);
void WriteExitDestInR(ArmGen::ARMReg Reg);
void WriteSyscallExit();
bool CheckJitBreakpoint(u32 addr, int downcountOffset);
bool CheckMemoryBreakpoint(int instructionOffset = 0);
// Utility compilation functions
void BranchFPFlag(MIPSOpcode op, CCFlags cc, bool likely);
void BranchVFPUFlag(MIPSOpcode op, CCFlags cc, bool likely);
void BranchRSZeroComp(MIPSOpcode op, CCFlags cc, bool andLink, bool likely);
void BranchRSRTComp(MIPSOpcode op, CCFlags cc, bool likely);
// Utilities to reduce duplicated code
void CompImmLogic(MIPSGPReg rs, MIPSGPReg rt, u32 uimm, void (ARMXEmitter::*arith)(ArmGen::ARMReg dst, ArmGen::ARMReg src, ArmGen::Operand2 op2), bool (ARMXEmitter::*tryArithI2R)(ArmGen::ARMReg dst, ArmGen::ARMReg src, u32 val), u32 (*eval)(u32 a, u32 b));
void CompType3(MIPSGPReg rd, MIPSGPReg rs, MIPSGPReg rt, void (ARMXEmitter::*arithOp2)(ArmGen::ARMReg dst, ArmGen::ARMReg rm, ArmGen::Operand2 rn), bool (ARMXEmitter::*tryArithI2R)(ArmGen::ARMReg dst, ArmGen::ARMReg rm, u32 val), u32 (*eval)(u32 a, u32 b), bool symmetric = false);
void CompShiftImm(MIPSOpcode op, ArmGen::ShiftType shiftType, int sa);
void CompShiftVar(MIPSOpcode op, ArmGen::ShiftType shiftType);
void CompVrotShuffle(u8 *dregs, int imm, VectorSize sz, bool negSin);
void CompVV2OpCall(MIPSOpcode op);
void ApplyPrefixST(u8 *vregs, u32 prefix, VectorSize sz);
void ApplyPrefixD(const u8 *vregs, VectorSize sz);
void GetVectorRegsPrefixS(u8 *regs, VectorSize sz, int vectorReg) {
_assert_(js.prefixSFlag & JitState::PREFIX_KNOWN);
GetVectorRegs(regs, sz, vectorReg);
ApplyPrefixST(regs, js.prefixS, sz);
}
void GetVectorRegsPrefixT(u8 *regs, VectorSize sz, int vectorReg) {
_assert_(js.prefixTFlag & JitState::PREFIX_KNOWN);
GetVectorRegs(regs, sz, vectorReg);
ApplyPrefixST(regs, js.prefixT, sz);
}
void GetVectorRegsPrefixD(u8 *regs, VectorSize sz, int vectorReg);
// For NEON mappings, it will be easier to deal directly in ARM registers.
ArmGen::ARMReg NEONMapPrefixST(int vfpuReg, VectorSize sz, u32 prefix, int mapFlags);
ArmGen::ARMReg NEONMapPrefixS(int vfpuReg, VectorSize sz, int mapFlags) {
return NEONMapPrefixST(vfpuReg, sz, js.prefixS, mapFlags);
}
ArmGen::ARMReg NEONMapPrefixT(int vfpuReg, VectorSize sz, int mapFlags) {
return NEONMapPrefixST(vfpuReg, sz, js.prefixT, mapFlags);
}
struct DestARMReg {
ArmGen::ARMReg rd;
ArmGen::ARMReg backingRd;
VectorSize sz;
operator ArmGen::ARMReg() const { return rd; }
};
struct MappedRegs {
ArmGen::ARMReg vs;
ArmGen::ARMReg vt;
DestARMReg vd;
bool overlap;
};
MappedRegs NEONMapDirtyInIn(MIPSOpcode op, VectorSize dsize, VectorSize ssize, VectorSize tsize, bool applyPrefixes = true);
MappedRegs NEONMapInIn(MIPSOpcode op, VectorSize ssize, VectorSize tsize, bool applyPrefixes = true);
MappedRegs NEONMapDirtyIn(MIPSOpcode op, VectorSize dsize, VectorSize ssize, bool applyPrefixes = true);
DestARMReg NEONMapPrefixD(int vfpuReg, VectorSize sz, int mapFlags);
void NEONApplyPrefixD(DestARMReg dest);
// NEON utils
void NEONMaskToSize(ArmGen::ARMReg vs, VectorSize sz);
void NEONTranspose4x4(ArmGen::ARMReg cols[4]);
// Utils
void SetR0ToEffectiveAddress(MIPSGPReg rs, s16 offset);
void SetCCAndR0ForSafeAddress(MIPSGPReg rs, s16 offset, ArmGen::ARMReg tempReg, bool reverse = false);
void Comp_ITypeMemLR(MIPSOpcode op, bool load);
JitBlockCache blocks;
JitOptions jo;
JitState js;
ArmRegCache gpr;
ArmRegCacheFPU fpr;
MIPSState *mips_;
int dontLogBlocks;
int logBlocks;
public:
// Code pointers
const u8 *enterDispatcher;
const u8 *outerLoop;
const u8 *outerLoopPCInR0;
const u8 *dispatcherCheckCoreState;
const u8 *dispatcherPCInR0;
const u8 *dispatcher;
const u8 *dispatcherFetch;
const u8 *dispatcherNoCheck;
const u8 *restoreRoundingMode;
const u8 *applyRoundingMode;
const u8 *crashHandler;
const u8 *blockShadowHook;
};
} // namespace MIPSComp
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