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ppsspp/Core/MIPS/MIPSInt.cpp
Unknown W. Brackets 6df939034a Core: Cleanup some sign extensions for clarity.
2023-04-05 17:16:51 -07:00

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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/.
#include <cmath>
#include "Common/Data/Convert/SmallDataConvert.h"
#include "Common/Math/math_util.h"
#include "Common/BitSet.h"
#include "Common/BitScan.h"
#include "Common/CommonTypes.h"
#include "Core/Config.h"
#include "Core/Core.h"
#include "Core/MemMap.h"
#include "Core/MIPS/MIPS.h"
#include "Core/MIPS/MIPSCodeUtils.h"
#include "Core/MIPS/MIPSInt.h"
#include "Core/MIPS/MIPSTables.h"
#include "Core/Reporting.h"
#include "Core/HLE/HLE.h"
#include "Core/HLE/HLETables.h"
#include "Core/HLE/ReplaceTables.h"
#include "Core/System.h"
#define R(i) (currentMIPS->r[i])
#define F(i) (currentMIPS->f[i])
#define FI(i) (currentMIPS->fi[i])
#define FsI(i) (currentMIPS->fs[i])
#define PC (currentMIPS->pc)
#define _RS ((op>>21) & 0x1F)
#define _RT ((op>>16) & 0x1F)
#define _RD ((op>>11) & 0x1F)
#define _FS ((op>>11) & 0x1F)
#define _FT ((op>>16) & 0x1F)
#define _FD ((op>>6 ) & 0x1F)
#define _POS ((op>>6 ) & 0x1F)
#define _SIZE ((op>>11) & 0x1F)
#define HI currentMIPS->hi
#define LO currentMIPS->lo
static inline void DelayBranchTo(u32 where)
{
if (!Memory::IsValidAddress(where) || (where & 3) != 0) {
Core_ExecException(where, PC, ExecExceptionType::JUMP);
}
PC += 4;
mipsr4k.nextPC = where;
mipsr4k.inDelaySlot = true;
}
static inline void SkipLikely() {
MIPSInfo delaySlot = MIPSGetInfo(Memory::Read_Instruction(PC + 4, true));
// Don't actually skip if it is a jump (seen in Brooktown High.)
if (delaySlot & IS_JUMP) {
PC += 4;
} else {
PC += 8;
--mipsr4k.downcount;
}
}
int MIPS_SingleStep()
{
MIPSOpcode op = Memory::Read_Opcode_JIT(mipsr4k.pc);
if (mipsr4k.inDelaySlot) {
MIPSInterpret(op);
if (mipsr4k.inDelaySlot) {
mipsr4k.pc = mipsr4k.nextPC;
mipsr4k.inDelaySlot = false;
}
} else {
MIPSInterpret(op);
}
return 1;
}
namespace MIPSInt
{
void Int_Cache(MIPSOpcode op)
{
int imm = SignExtend16ToS32(op & 0xFFFF);
int rs = _RS;
uint32_t addr = R(rs) + imm;
int func = (op >> 16) & 0x1F;
// Let's only report this once per run to be safe from impacting perf.
static bool reportedAlignment = false;
// It appears that a cache line is 0x40 (64) bytes, loops in games
// issue the cache instruction at that interval.
// These codes might be PSP-specific, they don't match regular MIPS cache codes very well
// NOTE: If you add support for more, make sure they are handled in the various Jit::Comp_Cache.
switch (func) {
// Icache
case 8:
// Invalidate the instruction cache at this address.
// We assume the CPU won't be reset during this, so no locking.
if (MIPSComp::jit) {
// Let's over invalidate to be super safe.
uint32_t alignedAddr = addr & ~0x3F;
int size = 0x40 + (addr & 0x3F);
MIPSComp::jit->InvalidateCacheAt(alignedAddr, size);
// Using a bool to avoid locking/etc. in case it's slow.
if (!reportedAlignment && (addr & 0x3F) != 0) {
WARN_LOG_REPORT(JIT, "Unaligned icache invalidation of %08x (%08x + %d) at PC=%08x", addr, R(rs), imm, PC);
reportedAlignment = true;
}
if (alignedAddr <= PC + 4 && alignedAddr + size >= PC - 4) {
// This is probably rare so we don't use a static bool.
WARN_LOG_REPORT_ONCE(icacheInvalidatePC, JIT, "Invalidating address near PC: %08x (%08x + %d) at PC=%08x", addr, R(rs), imm, PC);
}
}
break;
// Dcache
case 24:
// "Create Dirty Exclusive" - for avoiding a cacheline fill before writing to it.
// Will cause garbage on the real machine so we just ignore it, the app will overwrite the cacheline.
break;
case 25: // Hit Invalidate - zaps the line if present in cache. Should not writeback???? scary.
// No need to do anything.
break;
case 27: // D-cube. Hit Writeback Invalidate. Tony Hawk Underground 2
break;
case 30: // GTA LCS, a lot. Fill (prefetch). Tony Hawk Underground 2
break;
default:
DEBUG_LOG(CPU, "cache instruction affecting %08x : function %i", addr, func);
}
PC += 4;
}
void Int_Syscall(MIPSOpcode op)
{
// Need to pre-move PC, as CallSyscall may result in a rescheduling!
// To do this neater, we'll need a little generated kernel loop that syscall can jump to and then RFI from
// but I don't see a need to bother.
if (mipsr4k.inDelaySlot)
{
mipsr4k.pc = mipsr4k.nextPC;
}
else
{
mipsr4k.pc += 4;
}
mipsr4k.inDelaySlot = false;
CallSyscall(op);
}
void Int_Sync(MIPSOpcode op)
{
//DEBUG_LOG(CPU, "sync");
PC += 4;
}
void Int_Break(MIPSOpcode op)
{
Reporting::ReportMessage("BREAK instruction hit");
Core_Break(PC);
PC += 4;
}
void Int_RelBranch(MIPSOpcode op)
{
int imm = (signed short)(op&0xFFFF)<<2;
int rs = _RS;
int rt = _RT;
u32 addr = PC + imm + 4;
switch (op >> 26)
{
case 4: if (R(rt) == R(rs)) DelayBranchTo(addr); else PC += 4; break; //beq
case 5: if (R(rt) != R(rs)) DelayBranchTo(addr); else PC += 4; break; //bne
case 6: if ((s32)R(rs) <= 0) DelayBranchTo(addr); else PC += 4; break; //blez
case 7: if ((s32)R(rs) > 0) DelayBranchTo(addr); else PC += 4; break; //bgtz
case 20: if (R(rt) == R(rs)) DelayBranchTo(addr); else SkipLikely(); break; //beql
case 21: if (R(rt) != R(rs)) DelayBranchTo(addr); else SkipLikely(); break; //bnel
case 22: if ((s32)R(rs) <= 0) DelayBranchTo(addr); else SkipLikely(); break; //blezl
case 23: if ((s32)R(rs) > 0) DelayBranchTo(addr); else SkipLikely(); break; //bgtzl
default:
_dbg_assert_msg_(false,"Trying to interpret instruction that can't be interpreted");
break;
}
}
void Int_RelBranchRI(MIPSOpcode op)
{
int imm = (signed short)(op&0xFFFF)<<2;
int rs = _RS;
u32 addr = PC + imm + 4;
switch ((op>>16) & 0x1F)
{
case 0: if ((s32)R(rs) < 0) DelayBranchTo(addr); else PC += 4; break;//bltz
case 1: if ((s32)R(rs) >= 0) DelayBranchTo(addr); else PC += 4; break;//bgez
case 2: if ((s32)R(rs) < 0) DelayBranchTo(addr); else SkipLikely(); break;//bltzl
case 3: if ((s32)R(rs) >= 0) DelayBranchTo(addr); else SkipLikely(); break;//bgezl
case 16: R(MIPS_REG_RA) = PC + 8; if ((s32)R(rs) < 0) DelayBranchTo(addr); else PC += 4; break;//bltzal
case 17: R(MIPS_REG_RA) = PC + 8; if ((s32)R(rs) >= 0) DelayBranchTo(addr); else PC += 4; break;//bgezal
case 18: R(MIPS_REG_RA) = PC + 8; if ((s32)R(rs) < 0) DelayBranchTo(addr); else SkipLikely(); break;//bltzall
case 19: R(MIPS_REG_RA) = PC + 8; if ((s32)R(rs) >= 0) DelayBranchTo(addr); else SkipLikely(); break;//bgezall
default:
_dbg_assert_msg_(false,"Trying to interpret instruction that can't be interpreted");
break;
}
}
void Int_VBranch(MIPSOpcode op)
{
int imm = (signed short)(op&0xFFFF)<<2;
u32 addr = PC + imm + 4;
// x, y, z, w, any, all, (invalid), (invalid)
int imm3 = (op>>18)&7;
int val = (currentMIPS->vfpuCtrl[VFPU_CTRL_CC] >> imm3) & 1;
switch ((op >> 16) & 3)
{
case 0: if (!val) DelayBranchTo(addr); else PC += 4; break; //bvf
case 1: if ( val) DelayBranchTo(addr); else PC += 4; break; //bvt
case 2: if (!val) DelayBranchTo(addr); else SkipLikely(); break; //bvfl
case 3: if ( val) DelayBranchTo(addr); else SkipLikely(); break; //bvtl
}
}
void Int_FPUBranch(MIPSOpcode op)
{
int imm = (signed short)(op&0xFFFF)<<2;
u32 addr = PC + imm + 4;
switch((op>>16)&0x1f)
{
case 0: if (!currentMIPS->fpcond) DelayBranchTo(addr); else PC += 4; break;//bc1f
case 1: if ( currentMIPS->fpcond) DelayBranchTo(addr); else PC += 4; break;//bc1t
case 2: if (!currentMIPS->fpcond) DelayBranchTo(addr); else SkipLikely(); break;//bc1fl
case 3: if ( currentMIPS->fpcond) DelayBranchTo(addr); else SkipLikely(); break;//bc1tl
default:
_dbg_assert_msg_(false,"Trying to interpret instruction that can't be interpreted");
break;
}
}
void Int_JumpType(MIPSOpcode op)
{
if (mipsr4k.inDelaySlot)
ERROR_LOG(CPU, "Jump in delay slot :(");
u32 off = ((op & 0x03FFFFFF) << 2);
u32 addr = (currentMIPS->pc & 0xF0000000) | off;
switch (op>>26)
{
case 2: //j
if (!mipsr4k.inDelaySlot)
DelayBranchTo(addr);
break;
case 3: //jal
R(MIPS_REG_RA) = PC + 8;
if (!mipsr4k.inDelaySlot)
DelayBranchTo(addr);
break;
default:
_dbg_assert_msg_(false,"Trying to interpret instruction that can't be interpreted");
break;
}
}
void Int_JumpRegType(MIPSOpcode op)
{
if (mipsr4k.inDelaySlot)
{
// There's one of these in Star Soldier at 0881808c, which seems benign.
ERROR_LOG(CPU, "Jump in delay slot :(");
}
int rs = _RS;
int rd = _RD;
u32 addr = R(rs);
switch (op & 0x3f)
{
case 8: //jr
if (!mipsr4k.inDelaySlot)
DelayBranchTo(addr);
break;
case 9: //jalr
if (rd != 0)
R(rd) = PC + 8;
// Update rd, but otherwise do not take the branch if we're branching.
if (!mipsr4k.inDelaySlot)
DelayBranchTo(addr);
break;
}
}
void Int_IType(MIPSOpcode op)
{
u32 uimm = op & 0xFFFF;
u32 suimm = SignExtend16ToU32(op);
s32 simm = SignExtend16ToS32(op);
int rt = _RT;
int rs = _RS;
if (rt == 0) { //destination register is zero register
PC += 4;
return; //nop
}
switch (op>>26)
{
case 8: R(rt) = R(rs) + simm; break; //addi
case 9: R(rt) = R(rs) + simm; break; //addiu
case 10: R(rt) = (s32)R(rs) < simm; break; //slti
case 11: R(rt) = R(rs) < suimm; break; //sltiu
case 12: R(rt) = R(rs) & uimm; break; //andi
case 13: R(rt) = R(rs) | uimm; break; //ori
case 14: R(rt) = R(rs) ^ uimm; break; //xori
case 15: R(rt) = uimm << 16; break; //lui
default:
_dbg_assert_msg_(false,"Trying to interpret instruction that can't be interpreted");
break;
}
PC += 4;
}
void Int_StoreSync(MIPSOpcode op)
{
int imm = (signed short)(op&0xFFFF);
int rt = _RT;
int rs = _RS;
u32 addr = R(rs) + imm;
switch (op >> 26)
{
case 48: // ll
if (rt != 0) {
R(rt) = Memory::Read_U32(addr);
}
currentMIPS->llBit = 1;
break;
case 56: // sc
if (currentMIPS->llBit) {
Memory::Write_U32(R(rt), addr);
if (rt != 0) {
R(rt) = 1;
}
} else if (rt != 0) {
R(rt) = 0;
}
break;
default:
_dbg_assert_msg_(false,"Trying to interpret instruction that can't be interpreted");
break;
}
PC += 4;
}
void Int_RType3(MIPSOpcode op)
{
int rt = _RT;
int rs = _RS;
int rd = _RD;
// Don't change $zr.
if (rd == 0)
{
PC += 4;
return;
}
switch (op & 63)
{
case 10: if (R(rt) == 0) R(rd) = R(rs); break; //movz
case 11: if (R(rt) != 0) R(rd) = R(rs); break; //movn
case 32: R(rd) = R(rs) + R(rt); break; //add (exception on overflow)
case 33: R(rd) = R(rs) + R(rt); break; //addu
case 34: R(rd) = R(rs) - R(rt); break; //sub (exception on overflow)
case 35: R(rd) = R(rs) - R(rt); break; //subu
case 36: R(rd) = R(rs) & R(rt); break; //and
case 37: R(rd) = R(rs) | R(rt); break; //or
case 38: R(rd) = R(rs) ^ R(rt); break; //xor
case 39: R(rd) = ~(R(rs) | R(rt)); break; //nor
case 42: R(rd) = (s32)R(rs) < (s32)R(rt); break; //slt
case 43: R(rd) = R(rs) < R(rt); break; //sltu
case 44: R(rd) = ((s32)R(rs) > (s32)R(rt)) ? R(rs) : R(rt); break; //max
case 45: R(rd) = ((s32)R(rs) < (s32)R(rt)) ? R(rs) : R(rt); break;//min
default:
_dbg_assert_msg_( 0, "Unknown MIPS instruction %08x", op.encoding);
break;
}
PC += 4;
}
void Int_ITypeMem(MIPSOpcode op)
{
int imm = (signed short)(op&0xFFFF);
int rt = _RT;
int rs = _RS;
u32 addr = R(rs) + imm;
if (((op >> 29) & 1) == 0 && rt == 0) {
// Don't load anything into $zr
PC += 4;
return;
}
switch (op >> 26)
{
case 32: R(rt) = SignExtend8ToU32(Memory::Read_U8(addr)); break; //lb
case 33: R(rt) = SignExtend16ToU32(Memory::Read_U16(addr)); break; //lh
case 35: R(rt) = Memory::Read_U32(addr); break; //lw
case 36: R(rt) = Memory::Read_U8 (addr); break; //lbu
case 37: R(rt) = Memory::Read_U16(addr); break; //lhu
case 40: Memory::Write_U8(R(rt), addr); break; //sb
case 41: Memory::Write_U16(R(rt), addr); break; //sh
case 43: Memory::Write_U32(R(rt), addr); break; //sw
// When there's an LWL and an LWR together, we should be able to peephole optimize that
// into a single non-alignment-checking LW.
case 34: //lwl
{
u32 shift = (addr & 3) * 8;
u32 mem = Memory::Read_U32(addr & 0xfffffffc);
u32 result = ( u32(R(rt)) & (0x00ffffff >> shift) ) | ( mem << (24 - shift) );
R(rt) = result;
}
break;
case 38: //lwr
{
u32 shift = (addr & 3) * 8;
u32 mem = Memory::Read_U32(addr & 0xfffffffc);
u32 regval = R(rt);
u32 result = ( regval & (0xffffff00 << (24 - shift)) ) | ( mem >> shift );
R(rt) = result;
}
break;
case 42: //swl
{
u32 shift = (addr & 3) * 8;
u32 mem = Memory::Read_U32(addr & 0xfffffffc);
u32 result = ( ( u32(R(rt)) >> (24 - shift) ) ) | ( mem & (0xffffff00 << shift) );
Memory::Write_U32(result, (addr & 0xfffffffc));
}
break;
case 46: //swr
{
u32 shift = (addr & 3) << 3;
u32 mem = Memory::Read_U32(addr & 0xfffffffc);
u32 result = ( ( u32(R(rt)) << shift ) | (mem & (0x00ffffff >> (24 - shift)) ) );
Memory::Write_U32(result, (addr & 0xfffffffc));
}
break;
default:
_dbg_assert_msg_(false,"Trying to interpret Mem instruction that can't be interpreted");
break;
}
PC += 4;
}
void Int_FPULS(MIPSOpcode op)
{
s32 offset = (s16)(op&0xFFFF);
int ft = _FT;
int rs = _RS;
u32 addr = R(rs) + offset;
switch(op >> 26)
{
case 49: FI(ft) = Memory::Read_U32(addr); break; //lwc1
case 57: Memory::Write_U32(FI(ft), addr); break; //swc1
default:
_dbg_assert_msg_(false,"Trying to interpret FPULS instruction that can't be interpreted");
break;
}
PC += 4;
}
void Int_mxc1(MIPSOpcode op)
{
int fs = _FS;
int rt = _RT;
switch ((op>>21)&0x1f) {
case 0: //mfc1
if (rt != 0)
R(rt) = FI(fs);
break;
case 2: //cfc1
if (rt != 0) {
if (fs == 31) {
currentMIPS->fcr31 = (currentMIPS->fcr31 & ~(1<<23)) | ((currentMIPS->fpcond & 1)<<23);
R(rt) = currentMIPS->fcr31;
} else if (fs == 0) {
R(rt) = MIPSState::FCR0_VALUE;
} else {
WARN_LOG_REPORT(CPU, "ReadFCR: Unexpected reg %d", fs);
R(rt) = 0;
}
break;
}
case 4: //mtc1
FI(fs) = R(rt);
break;
case 6: //ctc1
{
u32 value = R(rt);
if (fs == 31) {
currentMIPS->fcr31 = value & 0x0181FFFF;
currentMIPS->fpcond = (value >> 23) & 1;
// Don't bother locking, assuming the CPU can't be reset now anyway.
if (MIPSComp::jit) {
// In case of DISABLE, we need to tell jit we updated FCR31.
MIPSComp::jit->UpdateFCR31();
}
} else {
WARN_LOG_REPORT(CPU, "WriteFCR: Unexpected reg %d (value %08x)", fs, value);
}
DEBUG_LOG(CPU, "FCR%i written to, value %08x", fs, value);
break;
}
default:
_dbg_assert_msg_(false,"Trying to interpret instruction that can't be interpreted");
break;
}
PC += 4;
}
void Int_RType2(MIPSOpcode op)
{
int rs = _RS;
int rd = _RD;
// Don't change $zr.
if (rd == 0)
{
PC += 4;
return;
}
switch (op & 63)
{
case 22: //clz
R(rd) = clz32(R(rs));
break;
case 23: //clo
R(rd) = clz32(~R(rs));
break;
default:
_dbg_assert_msg_(false,"Trying to interpret instruction that can't be interpreted");
break;
}
PC += 4;
}
void Int_MulDivType(MIPSOpcode op)
{
int rt = _RT;
int rs = _RS;
int rd = _RD;
switch (op & 63)
{
case 24: //mult
{
s64 result = (s64)(s32)R(rs) * (s64)(s32)R(rt);
u64 resultBits = (u64)(result);
LO = (u32)(resultBits);
HI = (u32)(resultBits>>32);
}
break;
case 25: //multu
{
u64 resultBits = (u64)R(rs) * (u64)R(rt);
LO = (u32)(resultBits);
HI = (u32)(resultBits>>32);
}
break;
case 28: //madd
{
u32 a=R(rs),b=R(rt),hi=HI,lo=LO;
u64 origValBits = (u64)lo | ((u64)(hi)<<32);
s64 origVal = (s64)origValBits;
s64 result = origVal + (s64)(s32)a * (s64)(s32)b;
u64 resultBits = (u64)(result);
LO = (u32)(resultBits);
HI = (u32)(resultBits>>32);
}
break;
case 29: //maddu
{
u32 a=R(rs),b=R(rt),hi=HI,lo=LO;
u64 origVal = (u64)lo | ((u64)(hi)<<32);
u64 result = origVal + (u64)a * (u64)b;
LO = (u32)(result);
HI = (u32)(result>>32);
}
break;
case 46: //msub
{
u32 a=R(rs),b=R(rt),hi=HI,lo=LO;
u64 origValBits = (u64)lo | ((u64)(hi)<<32);
s64 origVal = (s64)origValBits;
s64 result = origVal - (s64)(s32)a * (s64)(s32)b;
u64 resultBits = (u64)(result);
LO = (u32)(resultBits);
HI = (u32)(resultBits>>32);
}
break;
case 47: //msubu
{
u32 a=R(rs),b=R(rt),hi=HI,lo=LO;
u64 origVal = (u64)lo | ((u64)(hi)<<32);
u64 result = origVal - (u64)a * (u64)b;
LO = (u32)(result);
HI = (u32)(result>>32);
}
break;
case 16: if (rd != 0) R(rd) = HI; break; //mfhi
case 17: HI = R(rs); break; //mthi
case 18: if (rd != 0) R(rd) = LO; break; //mflo
case 19: LO = R(rs); break; //mtlo
case 26: //div
{
s32 a = (s32)R(rs);
s32 b = (s32)R(rt);
if (a == (s32)0x80000000 && b == -1) {
LO = 0x80000000;
HI = -1;
} else if (b != 0) {
LO = (u32)(a / b);
HI = (u32)(a % b);
} else {
LO = a < 0 ? 1 : -1;
HI = a;
}
}
break;
case 27: //divu
{
u32 a = R(rs);
u32 b = R(rt);
if (b != 0) {
LO = (a/b);
HI = (a%b);
} else {
LO = a <= 0xFFFF ? 0xFFFF : -1;
HI = a;
}
}
break;
default:
_dbg_assert_msg_(false,"Trying to interpret instruction that can't be interpreted");
break;
}
PC += 4;
}
void Int_ShiftType(MIPSOpcode op)
{
int rt = _RT;
int rs = _RS;
int rd = _RD;
int sa = _FD;
// Don't change $zr.
if (rd == 0)
{
PC += 4;
return;
}
switch (op & 0x3f)
{
case 0: R(rd) = R(rt) << sa; break; //sll
case 2:
if (_RS == 0) //srl
{
R(rd) = R(rt) >> sa;
break;
}
else if (_RS == 1) //rotr
{
R(rd) = __rotr(R(rt), sa);
break;
}
else
goto wrong;
case 3: R(rd) = (u32)(((s32)R(rt)) >> sa); break; //sra
case 4: R(rd) = R(rt) << (R(rs)&0x1F); break; //sllv
case 6:
if (_FD == 0) //srlv
{
R(rd) = R(rt) >> (R(rs)&0x1F);
break;
}
else if (_FD == 1) // rotrv
{
R(rd) = __rotr(R(rt), R(rs));
break;
}
else goto wrong;
case 7: R(rd) = (u32)(((s32)R(rt)) >> (R(rs)&0x1F)); break; //srav
default:
wrong:
_dbg_assert_msg_(false,"Trying to interpret instruction that can't be interpreted");
break;
}
PC += 4;
}
void Int_Allegrex(MIPSOpcode op)
{
int rt = _RT;
int rd = _RD;
// Don't change $zr.
if (rd == 0)
{
PC += 4;
return;
}
switch((op>>6)&31)
{
case 16: // seb
R(rd) = SignExtend8ToU32(R(rt));
break;
case 20: // bitrev
{
u32 tmp = 0;
for (int i = 0; i < 32; i++)
{
if (R(rt) & (1 << i))
{
tmp |= (0x80000000 >> i);
}
}
R(rd) = tmp;
}
break;
case 24: // seh
R(rd) = SignExtend16ToU32(R(rt));
break;
default:
_dbg_assert_msg_(false,"Trying to interpret ALLEGREX instruction that can't be interpreted");
break;
}
PC += 4;
}
void Int_Allegrex2(MIPSOpcode op)
{
int rt = _RT;
int rd = _RD;
// Don't change $zr.
if (rd == 0)
{
PC += 4;
return;
}
switch (op & 0x3ff)
{
case 0xA0: //wsbh
R(rd) = ((R(rt) & 0xFF00FF00) >> 8) | ((R(rt) & 0x00FF00FF) << 8);
break;
case 0xE0: //wsbw
R(rd) = swap32(R(rt));
break;
default:
_dbg_assert_msg_(false,"Trying to interpret ALLEGREX instruction that can't be interpreted");
break;
}
PC += 4;
}
void Int_Special2(MIPSOpcode op)
{
static int reported = 0;
switch (op & 0x3F)
{
case 36: // mfic
if (!reported) {
Reporting::ReportMessage("MFIC instruction hit (%08x) at %08x", op.encoding, currentMIPS->pc);
WARN_LOG(CPU,"MFIC Disable/Enable Interrupt CPU instruction");
reported = 1;
}
break;
case 38: // mtic
if (!reported) {
Reporting::ReportMessage("MTIC instruction hit (%08x) at %08x", op.encoding, currentMIPS->pc);
WARN_LOG(CPU,"MTIC Disable/Enable Interrupt CPU instruction");
reported = 1;
}
break;
}
PC += 4;
}
void Int_Special3(MIPSOpcode op)
{
int rs = _RS;
int rt = _RT;
int pos = _POS;
// Don't change $zr.
if (rt == 0) {
PC += 4;
return;
}
switch (op & 0x3f) {
case 0x0: //ext
{
int size = _SIZE + 1;
u32 sourcemask = 0xFFFFFFFFUL >> (32 - size);
R(rt) = (R(rs) >> pos) & sourcemask;
}
break;
case 0x4: //ins
{
int size = (_SIZE + 1) - pos;
u32 sourcemask = 0xFFFFFFFFUL >> (32 - size);
u32 destmask = sourcemask << pos;
R(rt) = (R(rt) & ~destmask) | ((R(rs)&sourcemask) << pos);
}
break;
}
PC += 4;
}
void Int_FPU2op(MIPSOpcode op)
{
int fs = _FS;
int fd = _FD;
switch (op & 0x3f)
{
case 4: F(fd) = sqrtf(F(fs)); break; //sqrt
case 5: F(fd) = fabsf(F(fs)); break; //abs
case 6: F(fd) = F(fs); break; //mov
case 7: F(fd) = -F(fs); break; //neg
case 12:
case 13:
case 14:
case 15:
if (my_isnanorinf(F(fs)))
{
FsI(fd) = my_isinf(F(fs)) && F(fs) < 0.0f ? -2147483648LL : 2147483647LL;
break;
}
switch (op & 0x3f)
{
case 12: FsI(fd) = (int)floorf(F(fs)+0.5f); break; //round.w.s
case 13: //trunc.w.s
if (F(fs) >= 0.0f) {
FsI(fd) = (int)floorf(F(fs));
// Overflow, but it was positive.
if (FsI(fd) == -2147483648LL) {
FsI(fd) = 2147483647LL;
}
} else {
// Overflow happens to be the right value anyway.
FsI(fd) = (int)ceilf(F(fs));
}
break;
case 14: FsI(fd) = (int)ceilf (F(fs)); break; //ceil.w.s
case 15: FsI(fd) = (int)floorf(F(fs)); break; //floor.w.s
}
break;
case 32: F(fd) = (float)FsI(fs); break; //cvt.s.w
case 36:
if (my_isnanorinf(F(fs)))
{
FsI(fd) = my_isinf(F(fs)) && F(fs) < 0.0f ? -2147483648LL : 2147483647LL;
break;
}
switch (currentMIPS->fcr31 & 3)
{
case 0: FsI(fd) = (int)round_ieee_754(F(fs)); break; // RINT_0
case 1: FsI(fd) = (int)F(fs); break; // CAST_1
case 2: FsI(fd) = (int)ceilf(F(fs)); break; // CEIL_2
case 3: FsI(fd) = (int)floorf(F(fs)); break; // FLOOR_3
}
break; //cvt.w.s
default:
_dbg_assert_msg_(false,"Trying to interpret FPU2Op instruction that can't be interpreted");
break;
}
PC += 4;
}
void Int_FPUComp(MIPSOpcode op)
{
int fs = _FS;
int ft = _FT;
bool cond;
switch (op & 0xf)
{
case 0: //f
case 8: //sf
cond = false;
break;
case 1: //un
case 9: //ngle
cond = my_isnan(F(fs)) || my_isnan(F(ft));
break;
case 2: //eq
case 10: //seq
cond = !my_isnan(F(fs)) && !my_isnan(F(ft)) && (F(fs) == F(ft));
break;
case 3: //ueq
case 11: //ngl
cond = (F(fs) == F(ft)) || my_isnan(F(fs)) || my_isnan(F(ft));
break;
case 4: //olt
case 12: //lt
cond = (F(fs) < F(ft));
break;
case 5: //ult
case 13: //nge
cond = (F(fs) < F(ft)) || my_isnan(F(fs)) || my_isnan(F(ft));
break;
case 6: //ole
case 14: //le
cond = (F(fs) <= F(ft));
break;
case 7: //ule
case 15: //ngt
cond = (F(fs) <= F(ft)) || my_isnan(F(fs)) || my_isnan(F(ft));
break;
default:
_dbg_assert_msg_(false,"Trying to interpret FPUComp instruction that can't be interpreted");
cond = false;
break;
}
currentMIPS->fpcond = cond;
PC += 4;
}
void Int_FPU3op(MIPSOpcode op)
{
int ft = _FT;
int fs = _FS;
int fd = _FD;
switch (op & 0x3f)
{
case 0: F(fd) = F(fs) + F(ft); break; // add.s
case 1: F(fd) = F(fs) - F(ft); break; // sub.s
case 2: // mul.s
if ((my_isinf(F(fs)) && F(ft) == 0.0f) || (my_isinf(F(ft)) && F(fs) == 0.0f)) {
// Must be positive NAN, see #12519.
FI(fd) = 0x7fc00000;
} else {
F(fd) = F(fs) * F(ft);
}
break;
case 3: F(fd) = F(fs) / F(ft); break; // div.s
default:
_dbg_assert_msg_(false,"Trying to interpret FPU3Op instruction that can't be interpreted");
break;
}
PC += 4;
}
void Int_Interrupt(MIPSOpcode op)
{
static int reported = 0;
switch (op & 1)
{
case 0:
if (!reported) {
Reporting::ReportMessage("INTERRUPT instruction hit (%08x) at %08x", op.encoding, currentMIPS->pc);
WARN_LOG(CPU,"Disable/Enable Interrupt CPU instruction");
reported = 1;
}
break;
}
PC += 4;
}
void Int_Emuhack(MIPSOpcode op)
{
if (((op >> 24) & 3) != EMUOP_CALL_REPLACEMENT) {
_dbg_assert_msg_(false,"Trying to interpret emuhack instruction that can't be interpreted");
}
// It's a replacement func!
int index = op.encoding & 0xFFFFFF;
const ReplacementTableEntry *entry = GetReplacementFunc(index);
if (entry && entry->replaceFunc && (entry->flags & REPFLAG_DISABLED) == 0) {
entry->replaceFunc();
if (entry->flags & (REPFLAG_HOOKENTER | REPFLAG_HOOKEXIT)) {
// Interpret the original instruction under the hook.
MIPSInterpret(Memory::Read_Instruction(PC, true));
} else {
PC = currentMIPS->r[MIPS_REG_RA];
}
} else {
if (!entry || !entry->replaceFunc) {
ERROR_LOG(CPU, "Bad replacement function index %i", index);
}
// Interpret the original instruction under it.
MIPSInterpret(Memory::Read_Instruction(PC, true));
}
}
}
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