203 lines
6.3 KiB
C++
203 lines
6.3 KiB
C++
/* This file is part of the dynarmic project.
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* Copyright (c) 2016 MerryMage
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* This software may be used and distributed according to the terms of the GNU
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* General Public License version 2 or any later version.
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*/
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#include "backend_x64/a32_jitstate.h"
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#include "backend_x64/block_of_code.h"
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#include "common/assert.h"
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#include "common/bit_util.h"
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#include "common/common_types.h"
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#include "frontend/A32/location_descriptor.h"
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namespace Dynarmic::BackendX64 {
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/**
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* CPSR Bits
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* =========
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*
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* ARM CPSR flags
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* --------------
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* N bit 31 Negative flag
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* Z bit 30 Zero flag
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* C bit 29 Carry flag
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* V bit 28 oVerflow flag
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* Q bit 27 Saturation flag
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* J bit 24 Jazelle instruction set flag
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* GE bits 16-19 Greater than or Equal flags
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* E bit 9 Data Endianness flag
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* A bit 8 Disable imprecise Aborts
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* I bit 7 Disable IRQ interrupts
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* F bit 6 Disable FIQ interrupts
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* T bit 5 Thumb instruction set flag
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* M bits 0-4 Processor Mode bits
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*
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* x64 LAHF+SETO flags
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* -------------------
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* SF bit 15 Sign flag
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* ZF bit 14 Zero flag
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* AF bit 12 Auxiliary flag
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* PF bit 10 Parity flag
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* CF bit 8 Carry flag
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* OF bit 0 Overflow flag
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*/
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u32 A32JitState::Cpsr() const {
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ASSERT((CPSR_nzcv & ~0xF0000000) == 0);
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ASSERT((CPSR_q & ~1) == 0);
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ASSERT((CPSR_et & ~3) == 0);
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ASSERT((CPSR_jaifm & ~0x010001DF) == 0);
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u32 cpsr = 0;
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// NZCV flags
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cpsr |= CPSR_nzcv;
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// Q flag
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cpsr |= CPSR_q ? 1 << 27 : 0;
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// GE flags
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cpsr |= Common::Bit<31>(CPSR_ge) ? 1 << 19 : 0;
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cpsr |= Common::Bit<23>(CPSR_ge) ? 1 << 18 : 0;
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cpsr |= Common::Bit<15>(CPSR_ge) ? 1 << 17 : 0;
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cpsr |= Common::Bit<7>(CPSR_ge) ? 1 << 16 : 0;
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// E flag, T flag
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cpsr |= Common::Bit<1>(CPSR_et) ? 1 << 9 : 0;
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cpsr |= Common::Bit<0>(CPSR_et) ? 1 << 5 : 0;
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// Other flags
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cpsr |= CPSR_jaifm;
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return cpsr;
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}
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void A32JitState::SetCpsr(u32 cpsr) {
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// NZCV flags
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CPSR_nzcv = cpsr & 0xF0000000;
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// Q flag
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CPSR_q = Common::Bit<27>(cpsr) ? 1 : 0;
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// GE flags
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CPSR_ge = 0;
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CPSR_ge |= Common::Bit<19>(cpsr) ? 0xFF000000 : 0;
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CPSR_ge |= Common::Bit<18>(cpsr) ? 0x00FF0000 : 0;
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CPSR_ge |= Common::Bit<17>(cpsr) ? 0x0000FF00 : 0;
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CPSR_ge |= Common::Bit<16>(cpsr) ? 0x000000FF : 0;
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// E flag, T flag
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CPSR_et = 0;
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CPSR_et |= Common::Bit<9>(cpsr) ? 2 : 0;
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CPSR_et |= Common::Bit<5>(cpsr) ? 1 : 0;
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// Other flags
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CPSR_jaifm = cpsr & 0x07F0FDDF;
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}
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void A32JitState::ResetRSB() {
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rsb_location_descriptors.fill(0xFFFFFFFFFFFFFFFFull);
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rsb_codeptrs.fill(0);
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}
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/**
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* Comparing MXCSR and FPSCR
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* =========================
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*
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* SSE MXCSR exception flags
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* -------------------------
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* PE bit 5 Precision Flag
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* UE bit 4 Underflow Flag
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* OE bit 3 Overflow Flag
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* ZE bit 2 Divide By Zero Flag
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* DE bit 1 Denormal Flag // Appears to only be set when MXCSR.DAZ = 0
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* IE bit 0 Invalid Operation Flag
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*
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* VFP FPSCR cumulative exception bits
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* -----------------------------------
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* IDC bit 7 Input Denormal cumulative exception bit // Only ever set when FPSCR.FTZ = 1
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* IXC bit 4 Inexact cumulative exception bit
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* UFC bit 3 Underflow cumulative exception bit
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* OFC bit 2 Overflow cumulative exception bit
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* DZC bit 1 Division by Zero cumulative exception bit
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* IOC bit 0 Invalid Operation cumulative exception bit
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*
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* SSE MSCSR exception masks
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* -------------------------
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* PM bit 12 Precision Mask
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* UM bit 11 Underflow Mask
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* OM bit 10 Overflow Mask
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* ZM bit 9 Divide By Zero Mask
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* DM bit 8 Denormal Mask
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* IM bit 7 Invalid Operation Mask
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*
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* VFP FPSCR exception trap enables
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* --------------------------------
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* IDE bit 15 Input Denormal exception trap enable
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* IXE bit 12 Inexact exception trap enable
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* UFE bit 11 Underflow exception trap enable
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* OFE bit 10 Overflow exception trap enable
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* DZE bit 9 Division by Zero exception trap enable
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* IOE bit 8 Invalid Operation exception trap enable
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*
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* SSE MXCSR mode bits
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* -------------------
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* FZ bit 15 Flush To Zero
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* DAZ bit 6 Denormals Are Zero
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* RN bits 13-14 Round to {0 = Nearest, 1 = Negative, 2 = Positive, 3 = Zero}
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*
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* VFP FPSCR mode bits
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* -------------------
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* DN bit 25 Default NaN
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* FZ bit 24 Flush to Zero
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* RMode bits 22-23 Round to {0 = Nearest, 1 = Positive, 2 = Negative, 3 = Zero}
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* Stride bits 20-21 Vector stride
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* Len bits 16-18 Vector length
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*/
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// NZCV; QC (ASMID only), AHP; DN, FZ, RMode, Stride; SBZP; Len; trap enables; cumulative bits
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constexpr u32 FPSCR_MODE_MASK = A32::LocationDescriptor::FPSCR_MODE_MASK;
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constexpr u32 FPSCR_NZCV_MASK = 0xF0000000;
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u32 A32JitState::Fpscr() const {
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ASSERT((FPSCR_mode & ~FPSCR_MODE_MASK) == 0);
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ASSERT((FPSCR_nzcv & ~FPSCR_NZCV_MASK) == 0);
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ASSERT((FPSCR_IDC & ~(1 << 7)) == 0);
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ASSERT((FPSCR_UFC & ~(1 << 3)) == 0);
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u32 FPSCR = FPSCR_mode | FPSCR_nzcv;
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FPSCR |= (guest_MXCSR & 0b0000000000001); // IOC = IE
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FPSCR |= (guest_MXCSR & 0b0000000111100) >> 1; // IXC, UFC, OFC, DZC = PE, UE, OE, ZE
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FPSCR |= FPSCR_IDC;
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FPSCR |= FPSCR_UFC;
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FPSCR |= fpsr_exc;
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return FPSCR;
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}
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void A32JitState::SetFpscr(u32 FPSCR) {
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old_FPSCR = FPSCR;
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FPSCR_mode = FPSCR & FPSCR_MODE_MASK;
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FPSCR_nzcv = FPSCR & FPSCR_NZCV_MASK;
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guest_MXCSR = 0;
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// Exception masks / enables
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guest_MXCSR |= 0x00001f80; // mask all
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//guest_MXCSR |= (~FPSCR >> 1) & 0b0000010000000; // IM = ~IOE
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//guest_MXCSR |= (~FPSCR >> 7) & 0b0000100000000; // DM = ~IDE
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//guest_MXCSR |= (~FPSCR ) & 0b1111000000000; // PM, UM, OM, ZM = ~IXE, ~UFE, ~OFE, ~DZE
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// RMode
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const std::array<u32, 4> MXCSR_RMode {0x0, 0x4000, 0x2000, 0x6000};
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guest_MXCSR |= MXCSR_RMode[(FPSCR >> 22) & 0x3];
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// Cumulative flags IDC, IOC, IXC, UFC, OFC, DZC
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FPSCR_IDC = 0;
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FPSCR_UFC = 0;
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fpsr_exc = FPSCR & 0x9F;
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if (Common::Bit<24>(FPSCR)) {
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// VFP Flush to Zero
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//guest_MXCSR |= (1 << 15); // SSE Flush to Zero
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//guest_MXCSR |= (1 << 6); // SSE Denormals are Zero
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}
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}
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u64 A32JitState::GetUniqueHash() const {
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return CPSR_et | FPSCR_mode | (static_cast<u64>(Reg[15]) << 32);
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}
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} // namespace Dynarmic::BackendX64
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